Monday, 20 June 2011

Eritrea Nabro volcano activity : watch the eruption from outer space


Last update: June 20, 2011 at 10:48 am by By Armand Vervaeck and James Daniell 141 Comments


Earthquake / Eruption summary : During the late afternoon and evening of June 12 2011, a series of moderate earthquakes struck the Afambo, Eritrea area. The moderate earthquakes were followed by 2 strong 5.7 earthquakes. Based on the earthquake pattern and the locations of the epicenter, volcano activity seemed imminent. Our very extensive report is also the work of many of our readers who gave a lot of input. This proves that together, we can beat a lot of information services, especially in developing countries. A strong M5.5 earthquake has occurred in a similar position on 17th June 2011, this is expected to also indicate volcanic activity.
Our video reporter / assembler Robert Speta has made a video based on the content of this article for those who do not like to read. Click here to watch it in our “Quake-TV.org” subsite.

UPDATE 20/06 – 09:36 UTC : The University of Wisconsin-Madison / Space and Engineering Center did a great job in mounting several outer space satellite pictures together to show the eruption from outer space. A sequence of EUMETSAT Meteosat-9 7.35 µm “water vapor channel” images (below; click image to play animation) was useful for following the leading edge of the volcanic plume (the volcano summit is circled on the first few images of the animation). Click here for the link to the University website and the original document.
Interesting to follow is how the first ash cloud travelled over the Middle-East on to Russia.

Meteosat-9 7.35 µm water vapor channel images (click image to play animation) - Courtesy Cooperative Institute for Meteorological Satellite Studies (CIMSS), University of Wisconsin – Madison, USA

UPDATE 20/06 – 09:01 UTC : Almost no change in activity the preceding hours.

UPDATE 19/06 – 21:36 UTC : According to NASA, the volcano spewed ash and large amounts of sulfur dioxide gas—the highest levels ever detected from space, according to preliminary estimates from researchers at NASA’s Goddard Space Flight Center.
Nabro is part of larger double-caldera structure with the Mallahle volcano to the southwest. Both volcanoes were built, like Kilimanjaro, from trachyte lavas, and later filled by eruptions of ignimibrite. Research suggests that both calderas may have formed around the same time. The volcanic range has been “virtually undocumented,” according to researchers.

UPDATE 19/06 – 18:30 UTC : The OGA page reveals that some minor Nabro seismic activity started already in May.

Maps courtesy OGA, Djibouti - Click on the map to view the in-depth description

UPDATE 19/06 – 18:25 UTC : We encourage our readers who are in search of the most detailed seismic information accompanying this eruption to visit the in-depth page of the Arta Geophysical Observatory (OGA) inDjibouti, a neighboring country.
Click here to view this very interesting webpage.

UPDATE 19/06 – 18:20 UTC : The pictures below have been registered by the NASA Modis Aqua satellite on June 19. The ash zone extends more than 60 km into Ethiopia.

NASA Modis Aqua satellite picture as taken in the morning of June 19 - Bands 7-2-1 image

NASA Modis Aqua satellite picture as taken in the morning of June 19 - true color image

UPDATE 19/06 – 10:01 UTC : As we can see on the picture below, the eruption area covers a part of Eritrea and Ethiopia. Earthquake-Reports.com hopes that both nations are setting aside their political struggles for at least a couple of weeks and will allow scientists from all over the world to examine the greater Nabro volcano area.
It would be “not to understand” if both governments are continuing to block scientists from visiting the area.

UPDATE 19/06 – 09:58 UTC : The red area was was earlier indicated on the NASA Modis Aqua satellite image2011/168 recorded on 06/17 at 10 :20 UTC and projected on the Google Earth Map. The distance in between the 2 most extended points is approx. 20 km. The yellow line is the border line in between Eritrea and Ethiopia. Although the crater is located in Eritrea, the actual eruption area also covers part of Ethiopia.
It is hard to tell at the moment that the area was mainly covered by lava flows are are partly ash deposits. The present satellite pictures are not detailed enough to be sure. We will have to wait for satellite spot images who can give us the detail of the surface.

UPDATE 19/06 – 07:57 UTC : Overview of the seismic activity near the Nabro caldera on Saturday and Sunday :
2011-06-19 05:47:16 4.0 Eritrea
2011-06-19 05:32:37 4.0 Eritrea
2011-06-19 02:33:12 3.2 Eritrea
2011-06-18 04:37:52 4.1 Eritrea
2011-06-18 03:32:18 3.0 Eritrea
2011-06-18 02:51:40 3.1 Eritrea
2011-06-18 02:47:21 3.8 Eritrea
2011-06-18 00:03:39 3.3 Eritrea
The magnitude of the surrounding earthquakes is decreasing slightly

UPDATE 19/06 – 07:30 UTC : Until last weekend, the Nabro volcano in northeast Africa looked like it does in the image below. Then, on the night of June 12, 2011, the stratovolcano erupted for the first time in recorded history.
Astronauts on the International Space Station snapped this digital photograph of Nabro in January 2011, when all was still quiet.
(text and picture courtesy NASA Earth Observatory)

Astronaut photograph ISS026-E-23526 courtesy Image Science and Analysis Laboratory, NASA Johnson Space Center. Caption by Michael Carlowicz.

UPDATE 18/06 – 13:25 UTC : The picture below is the activity as recorded this morning at 08:00 AM UTC. As you can see there is still some activity going on.

UPDATE 18/06 – 10:52 UTC : A few moments ago we received this message which we found to be trusted (for many reasons) : Im a Meteorologist in the area of this volcano and i am monitoring it on satellite and it has erupted again and is tracking south on the imagery i have.

Lava flows from Nabro volcano - thanks to Corrie and Fransisco for telling us

UPDATE 18/06 – 10:34 UTC : The lava field which was the result of this Nabro eruption is 20 km wide and about 10 km downwards.

UPDATE 18/06 – 09:57 UTC : Further to the seismic activity around the Nabro volcano, we can report that yesterday 8 worthwhile mentioning earthquakes occurred and as far as today we have noted 4 earthquakes.
No visual activity on weather satellites today.

UPDATE 17/06 – 15:36 UTC : Reader David Somsencomments : I wanted to let everyone know that Ethiopian Airlines has confirmed to me (on numerous occasions, because I still don’t believe it) that tomorrow’s flights in northern Ethiopia are still canceled.
Day 5 of being stuck in Gondar. Woohoo!

UPDATE 17/06 – 14:40 UTC : Following the Djibouti seismological service (OGA), at least 4 M+4 earthquakes have occurred today in the Nabro volcano area.
2011-06-17 12:55:48 4.0 Eritrea
2011-06-17 11:32:20 4.5 Eritrea
2011-06-17 10:05:16 4.3 Eritrea
2011-06-17 09:16:09 5.8 Eritrea

UPDATE 17/06 – 13:24 UTC : We have NO longer weather satellite visible Nabro activity. Both the visual as the infrared satellite weather images are smoke free. VAAC latest bulletin was at 06:00 UTC. The map is FREE of air traffic hindering ash clouds. Unless new elements are occurring, NO new bulletins will be published.
We have checked the satellite images at regular intervals and we could NOT detect any new increased activity after the new earthquake.
Most recent Sat24 infrared animation

Most recent Volcanic Ash Advisory bulletin (06:00 UTC bulletin)

UPDATE 17/06 – 13:08 UTC : Details of the recent earthquake in the immediate vicinity of Nabro volcano :

M 5.5 2011/06/17 09:16 Depth 10.0 km ERITREA – ETHIOPIA REGION

12:16:12 PM at epicenter
A volcanic activity triggered strong and dangerous earthquake near Nabro Volcano, on the border between Eritrea and Ethiopia.
120 km (74 miles) WNW of Assab, Eritrea
Satellite map of the greater epicenter area

UPDATE 17/06 – 10:03 UTC : WAPMERR is expecting casualties in Waddi from this earthquake, with between 0-100 deaths and 30-300 injured.
However, earthquake-report.com and CATDAT expect that there will be little loss of life given the activity in the area in the last 5 days.

UPDATE 17/06 – 09:47 UTC : A strong M5.5 earthquake has occurred in a similar position on 17th June 2011, this is expected to also indicate volcanic activity from Nabro again. We will wait for confirmation.

From USGS: 5.5Mw, 09:16:12 UTC, 12:16:12PM Local
Epicentral Location: 13.307°N, 41.668° with a hypocentral depth of 10km.

UPDATE 16/06 – 18:30 UTC : Ministry of Information of Eritrea press release:
Assab, June 16, 2011- The inhabitants of Afambo, Nebro and Sireru have disclosed that they have been moved to a safer location. Pointing out that there were occasional quakes in their areas, the inhabitants thanked the government for the fast relocation after the eruption, as a result of which there were no casualities.
It is to be recalled that the eruption of June 12th around the areas of Afambo, Nebro and Sireru released large quantities of dust and smoke and the quake of 5.7 Richter it caused was felt in our region.

UPDATE 16/06 – 18:13 UTC : Impressive picture of the eruption of the Nabro volcano in high-resolution, natural-color as recorded by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite on June 14, 2011. We also give you here the full text of the NASA Earth Observatory :
This high-resolution, natural-color satellite image shows details of the roiling plume of Eritrea’s Nabro Volcano. The thick plume obscures the site of the eruption, and most of Nabro’s 8-kilometer (5-mile) wide caldera. The bright white color of the plume indicates it contains a large amount of water vapor, with a slight blue tinge that hints at the presence of sulfur dioxide. Measurements from the Infrared Atmospheric Sounding Interferometer (IASI) aboard the European Space Agency’s MetOp-A satellite confirm sulfur dioxide from the plume over Northeast Africa and the Middle East.
If you want to download this picture in high resoltion, here are the links to do so :
download large image (1 MB, JPEG)
download GeoTIFF file (9 MB, TIFF)

NASA Earth Observatory image by Jesse Allen and Robert Simmon, using EO-1 ALI data. Caption by Robert Simmon.

UPDATE 16/06 – 17:38 UTC :
Most recent Sat24 infrared animation
(as the night is falling in the area, the current eruption states is hard to determine on the satellite pictures)
Most recent Volcanic Ash Advisory bulletin (18:00 UTC bulletin)

UPDATE 16/06 – 17:35 UTC : OUT OF SERVICE FOR A COUPLE OF HOURS We are sorry that some of you got empty pages for a couple of hours. Due to a server issue we could not reach you any more :( . It is fixed now and hopefully everything remains as it was before.
We know that this page becomes very long, but the main reason for keeping it this way, is that there is a relation in between many updates and images. The page is loading relatively quick here. If you should have problems with it, please let us know.

UPDATE 16/06 – 13:56 UTC : Press release from : Nevsun Resources Ltd. is pleased to report that the earthquakes and associated volcanic eruption in Eritrea have had no impact on operations at the Bisha mine and management does not expect any future material impact to operations. The volcano is over 300 km south and east from the Bisha site. There is no direct impact from the eruption or associated earthquakes on operations. The ash plume may periodically affect international air service to Asmara however this will not interrupt operations. (ER: Nevsun Resources is low cost gold producer active in its Bisha Mine in Eritrea)

UPDATE 16/06 – 13:40 UTC : The Djibouti based “Observatoire Géophysique Arta” has published far higher Magnitude values than earlier reported by EMSC. The Magnitudes they have listed were : 3.9, 4.4 and 4.5. As their Seismograph stations are very close to the Nabro volcano, we do consider these values as “to be trusted”

UPDATE 16/06 – 13:13 UTC : The picture of the ash cloud proves that the cloud is far more extending to the North West than this morning. The front of the present cloud has almost reached Khartoum in Sudan. Compare this picture with a similar picture we published at 08:35 this morning.
Interesting to know is also that the present cloud only contains ash close to the volcano. The extended plume contains mainly SO2 and Ice.
Most recent Sat24 animation
Most recent Volcanic Ash Advisory bulletin (12:00 UTC bulletin)

UPDATE 16/06 – 10:59 UTC : Below a brand new MODIS image from the Nabro volcano jst released by NASA.

UPDATE 16/06 – 10:55 UTC : A number of 3 new Magnitude 3 earthquakes did sett off a new stronger eruption from the Nabro volcano. The first of the 3 shocks occurred at 01:30 AM UTC (Thanks to Dr Franzky for mentioning)

Ash cloud on June 16 at 7 AM UTC

UPDATE 16/06 – 08:35 UTC : Most airlines have stopped serving some East Africa destinations. The following airlines have reported to cancel a number of their East African flights today :
Lufthansa
Ethiopian Airlines
Turkish Airlines
Fly Dubai
Kenya Airways
Emirates

UPDATE 16/06 – 07:41 UTC : The activity of the volcano picked up again. The Sat24 infrared animated satellite series is showing a far lengthier ash plume than yesterday. VAAC (Volcano ash advisory) has also increased the area which is contaminated with the ash cloud. Click here to see the ash maps (06:00 UTC bulletin).

UPDATE 15/06 – 23:31 UTC : Another compilation of the NASA MODUS HD satellite image as a layer on Google earth (with thanks to Martin Rey for the tips – see his instructions below to do it yourself)

UPDATE 15/06 – 22:35 UTC : VAAC Ash advisory bulletin at 18:00 UTC

UPDATE 15/06 – 21:31 UTC : Below the MODIS – - NASA picture as distributed taken on June 13, 1 day after the explosion – By using the highest definition, we were able to show the violent action much better than in most other sites . The picture is indeed a high resolution picture, but as said in the update below, satellite photography can show us much better details from the caldera. The present state of the eruption is a lot less intensive and might come up with more details.

UPDATE 15/06 – 20:28 UTC : When will the HD-satellite images be released from the current eruption ? Why are we making this remark ? We are almost sure that the satellite companies like NASA and EUMETSAT, to name a few, will be able to show us visual and infrared HD-pictures from the crater area. The Cnes SpotImages from Google earth are revealing almost every detail of the crater. If an identical image from the current state of the volcano would be published, it would certainly reveal what really happened. Unfortunately we have no other means of information at the moment. The MODIS picture showing the ash plume on June 13 was of a far too inferior quality.
If such HD-images do exist, can they please be published in the open Internet. If they do not exist, we hope that the satellite companies will do their best to make them soon, as they will be invaluable for science. Earthquake-report and their thousands of users will be very grateful to them.

Google earth picture of the Nabro volcano caldera before the eruption - courtesy Google earth and the copyright holders

UPDATE 15/06 – 16:14 UTC : This is the statement of Ethiopian Airlines earlier today :
The volcanic ash cloud in the Northern part of Ethiopia is clearing. Therefore, Ethiopian flights to Djibouti will resume today June 15, 2011. Flights to Khartoum and some destinations to the Northern part of Ethiopia are still suspended. We request all our passengers to call their nearest Ethiopian offices to coordinate their travel plans using the following contact addresses.

UPDATE 15/06 – 14:21 UTC : The composition of the volcano cloud is containing a lot less ash than in the early hours.

UPDATE 15/06 – 14:11 UTC : Press reports out of Djibouti are confirming our earlier information that the air space above Djibouti was closed on Tuesday. The smoke consists of fine particles of ash. The cloud has forced officials of Ethiopian Airlines to cancel flights to Djibouti, to the north of Ethiopia and to Khartoum, the Sudanese capital on Tuesday.

UPDATE 15/06 – 13:57 UTC : On the animated satellite picture one can see a faint ash cloud blowing to the west. Reading the new VAAC bulletin at 12:00 UTC, we can see that the lower cloud (20,000 feet) will perturb probably all air-traffic to Djibouti.
Latest Ash Advisory bulletin (12 AM UTC) - Recent animated satellite picture

UPDATE 15/06 – 08:28 UTC : We have changed the title into “still NO news from the Nabro area after more than 2 days!” to express our sadness that after more than 2 days nobody in the world can give us a precise picture on what exactly happened at the moment of the explosion / eruption. The bulletin from the Eritrean government only stating some generalities is far from satisfying. We do experience here an eruption of a historic volcano, which should be world news, but we can only assume that the location of the volcano is one of the reasons.

UPDATE 15/06 – 07:15 UTC : As we have still NO information from the ground, we continue to work with the satellite weather images and with the Ash advisory bulletins. Based on both, we see a strong decrease in activity.
Latest Ash Advisory bulletin ( 15/06 – 6 AM) - Recent animated satellite picture

UPDATE 15/06 – 07:10 UTC : Dawid Wolde reports from Djibouti : Stuck in Djibouti with all flights out of Djibouti canceled, we decided to drive to Lac Assal, a salt lake about 125 kms north of Djibouti city and considered to be the lowest point in Africa at 153 meters below sea level. We saw the ash cloud, the sun was completely blocked and we could not see the sea because of the ash.

UPDATE 14/06 – 21:11 UTC : Updated Ash advisory update from VAAC Toulouse at 18:00 UTC. Click here to see the latest Ash Advisory bulletin. Ash cloud near the volcano has decreased to 20,000 feet (6,096 m)

UPDATE 14/06 – 19:50 UTC : Ethiopian Air Lines has canceled today flights to Khartoum, Djibouti and Northern Ethiopia. the Exc. Director told the media that the ash cloud is approaching Addis Ababa in low altitude. The airline is forced to change route directions to Europe and Asia (report from Beni Yebi from Nazareth, Ethiopia).

UPDATE 14/06 – 19:43 UTC : The Eumetsat weather satellite RGB short movie sequence of the eruption on June 13 (thanks to Witold). Video copyright 2011 EUMETSAT


YouTube Direkt

UPDATE 14/06 – 16:11 UTC : A reader from Gondar Ethiopia wrote the following comment a few moments ago. We like his remark at the end :) :
Stranded in Gondar today…one of those domestic flights that got canceled. Thanks for all the updates. This website is amazing, and I couldn’t agree more about the terrible coverage on this eruption. The lack of news is really an undertone of how much the giant media conglomerates care about anything truly news-worthy. I do, however, know what Paris Hilton had for lunch yesterday, so there’s that…

UPDATE 14/06 – 15:44 UTC : May we kindly ask some cooperation from the scientific community here. Sharing the information they have collected in the open Internet would serve everybody in the world. There is a lot more to say about this eruption and similar eruptions in the area. Which volcanologists or geologists have reasonable resolution pictures from the Nabro volcano they want to share with the open Internet.

UPDATE 14/06 – 15:34 UTC : Almost 2 days after the explosion of the volcano, we are still without any in-depth news and/or pictures from the eruption of the Nabro volcano. Maybe Mrs Clinton has seen the eruption from the air and could send us some pictures. The eruption did increase a little bit like reported by reader Guigui (see comments). Click here to see the current infrared image.

UPDATE 14/06 – 15:24 UTC : Updated Ash advisory update from VAAC Toulouse at 12:00 UTC. Click here to see the latest Ash Advisory bulletin.

UPDATE 14/06 – 12:03 UTC : Based on the data from VAAC (Volcanic Ash advisory) we can clearly see that theeruption in winding down. There is some remaining activity as ash clouds are still blown in the atmosphere until an altitude of 20,000 feet (6,096 m). Compared to the pictures below the ash plume is much more dispersed and shorter in length. Click here for the Sat24.com dynamic infrared picture

UPDATE 14/06 – 12:01 UTC : New Ash advisory update from VAAC Toulouse at 10:00 UTC. Click here to see the latest Ash Advisory bulletin.

UPDATE 14/06 – 08:03 UTC : New Ash advisory update from VAAC Toulouse. Click here or on the picture below. We can only tell that the ash cloud is extending over the Middle East, later today and tomorrow even in Eurasia. The eruption is following this update still going on at full force (cloud altitude). This update was generated 2 hours ago.

UPDATE 14/06 – 08:00 UTC : Robert Speta made another overview video, telling most of the story below in 5 minutes


YouTube Direkt

UPDATE 13/06 – 20:07 UTC : Another report from the conditions in Asmara, the capital of Eritrea : Spoke to my uncle in Asmara right now. He says that the capital is fine and that there are people in Asmara who dont even know that there was an eruption. The eruption is in Assab and due to the wind, the ash is impacting Ethiopia moreso, apparently, which would explain why Clinton is cutting her trip to Addis short. It is almost 8p so i will call again tomorrow and update everyone once people are awake and more information has been gathered.

UPDATE 13/06 – 19:20 UTC : We got the following report out of Logia, Afar, Ethiopia : I’m an exploration geologist currently based in a camp near Logia, in the Afar desert in Ethiopia. We are approximately 200 km south-southwest of the volcano. We’ve been sat in the ash cloud since yesterday evening. See also his picture of the ash graying the sky and the horizon

UPDATE 13/06 – 18:47 UTC : Finally we got some news from the Eritrean government. We are printing their press release in full (Ministry of Information) :

Volcanic Eruption Witnessed In The Tip Of Southern Red Sea Region
Assab, 13 June 2011 -A volcanic eruption was witnessed in the tip of the Southern Red Sea region at 9 p.m. yesterday.
Reports indicated that the eruption that took place in 4 different areas around Afambo, Nebro and Sireru causing a 5.7 rector scale earth tremor.
The ensuing dust is covering hundreds of kilometers in the area, and that the quake has been heard in the greater portion of the region as a whole, according to reports.
The Southern regional Administration disclosed that the Government has moved the inhabitants in the area to a safe place, in addition to providing them with the necessary care. No damage has so far been inflicted to human life , the Administration added.
Although similar earthquake incidents were witnessed from time to time in previous years, yesterday’s tremor was of higher scale that led to volcanic eruption.

UPDATE 13/06 – 18:44 UTC : Eruption pattern became totally different. The eruption is still going on, but seems to decrease forcefully. The ash plume has a decreased considerably in length. Quite strange is also the current patchwork (ash clouds are not continuous anymore). Click here to see the live animated infrared video.

UPDATE 13/06 – 18:20 UTC : Eskinder Nega reports from the Ethiopian capital Addis Ababa : No ash in the air in Addis,though it was cloudy today.But this is also the beginning of the rainy season,clouds are not unusual. Hillary Clinton was forced to cut short a two days visit because of concerns of spreading ash.
She arrived early afternoon and was gone by early evening, according to the media reports.

IMPORTANT SCIENTIFIC UPDATE ON NABRO VOLCANO (source : The Volcanism Blog)
Nabro is a stratovolcano reaching to 2,218 metres a.s.l., truncated by nested calderas of 5 km and 8 km diameter, the latter caldera having a wide breach to the SW.
Although Nabro has no recorded Holocene eruptive activity, the GVP (from which this description comes) notes that ‘ Some very recent lava flows were erupted from NNW-trending fissures transverse to the trend of the Nabro volcanic range’, so if the current activity is from the Nabro complex it does not necessarily represent the surprise re-awakening of the volcano after millennia of dormancy.
Wiart and Oppenheimer (2005) identify these ‘recent basaltic flows’ as originating from ‘Vents … located between Nabro and Mallahle calderas, and fed in part from fissures aligned perpendicularly to the NVR [Nabro Volcanic Complex] axis’ (p. 104), although, working with strictly limited data, they do not venture a date for these flows. Satellite imagery shows these flows as weathered, but fresher and distinctly darker than surrounding material.

Nabro volcano complex - image courtesy The Volcano Blog

UPDATE 13/06 – 16:34 UTC : The ash cloud would probably travel to Saudi Arabia, Jordan and Israel

UPDATE 13/06 – 16:30 UTC : The Lufthansa flights to Ethiopia have been canceled because of the ash concentration in the atmosphere.

UPDATE 13/06 – 16:16 UTC : Ash from ongoing eruption at Nabra volcano in Eritrea is likely to reach southern border only; may cause more problems to Egypt, Jordan. (source : Jerusalem Post).

UPDATE 13/06 – 15:52 UTC : Reader Avo reports from Mekele (Northern Ethiopia and approx. 200 km from the volcano) : I am a Frenchman living in Mekele, Northern Ethiopia, East from the volcano. I found this site whiletrying to know where the ashes where coming from.
Waking up this morning, everything was covered by a 1mm, sometimes 2mm layer of black ashes. The sky was cloudy today, but abnormally greyish. Ashes where still in the air till noon, as I got some in my eyes a few times.

UPDATE 13/06 – 14:08 UTC : New 12:00 UTC Ash advisory bulletin” for Air Traffic. Click here or on the picture below. The plume is gradually extending but for the real risk also ash concentration should be looked at.

UPDATE 13/06 – 13:28 UTC : Tim reports from Asmara, Eritrea:
Confirmed that there is indeed some volcanic ash in the air in Asmara, Eritrea.
Tonights Lufthansa flight has been canceled
The Department of mines is monitoring the event closely.

UPDATE 13/06 – 12:05 UTC : NASA satellite images in combination with Google Earth have given the final clue in the discussion which volcano was erupting. It is NABRO volcano, a volcano that has NO sign of being erupted in recent history. This will be a major scientific research eruption. We are still awaiting further news from Eritrea, butthis news is making us happy, as Afambo will be far enough away from the volcano to not have received a direct impact.

Nabro volcano eruption June 12 2011 - the other green sign free of clouds is Dubbi volcano.

UPDATE 13/06 – 12:1705 UTC : Intermediate overview of the current situation (by Pieter De Leeuw):
The estimated height of the ash cloud is ~13.5km, according to the VAAC. This is an essential piece of information in predicting the current size of the eruption, as the height of the ash cloud often reflects the force behind the eruption. In this case, it would so far be an average-to-large eruption. For comparison; the ashcloud from the Eyjafjallajokull only came up to 9km in April 2010, the more recent Grimsvotn eruption in Iceland forced ash up to 20km in the air, and the 1981 Mt. St Helens eruption’s ashcloud reached 25km into the atmosphere.
There however is some uncertainty with this way of estimating the size of an eruption. The height of the ash-cloud is influenced by many factors, such as prevailing wind, eruption style and eruption angle. In this case strong winds seem to prevail (the plume traveled over 250km in 2 hours after the onset of the eruption). The eruption style seems to be a ‘gray’ eruption (with much ash, little lava) instead of a red eruption (much lava, little ash). The eruption angle is however not possible to determine. Most eruptions occur horizontally, but exceptions do occur, as happened with Mt. St. Helens. A landslide triggered a so called ‘lateral’ eruption. This is a possible scenario, as the earthquakes (up to M5.7) were strong enough to possibly have created landslide.
Also, when estimating an eruption size based on the magnitude of the preceding earthquakes, one should take into account that this volcano (Nabro volcano ER) possibly has been dormant for hundreds to thousands of years.
This could mean that the overlaying ground was not ductile for magma movements, and therefor a massive force was needed to force it’s way up to the surface.
These are all plain speculations based on the information we currently have, and by no means an official report.

UPDATE 13/06 – 12:05 UTC : The eruption is continuing at full strength based on the infrared weather satellite images from Sat24 at 12:00 UTC. Click here to watch the latest animated version.

Image courtesy sat24.com

UPDATE 13/06 – 11:13 UTC : Ethiopian media has warned citizens to protect themselves from the ash and smoke coming from the volcanic eruption.

UPDATE 13/06 – 11:09 UTC : As more and more journals are picking up the story, the guessing in between both Nabro and Dubbi goes on merely because everybody has still to rely on the satellite images. Those sources who have HD satellite images are putting their money on the Nabro, which would be a MAJOR EVENT for science, as this volcano has NO record of any historic eruptions so far. We @ earthquake-report.com do not guess anymore. We are simply awaiting news from the Asmara authorities.

UPDATE 13/06 – 10:47 UTC : A reader report out of Asmara, Eritrea (Ip number reflects Kenya intersat, probably the connecting carrier for Eritrea):
I live in the capital of Eritrea, Asmara, and I did not feel the earthquake, but the plume from the volcano is covering the whole of Asmara since the morning, but now it is clearing somewhat. I just heard that the flight Asmara-Jeddah-Frankfurt which was supposed to depart tonight, has been canceled. (We can not confirm the flight cancellation news but it looks normal to us).

UPDATE 13/06 – 10:37 UTC : The report below is bad news for the people living in the immediate surrounding of the volcano. Normal eruption behavior in the rift volcanoes is a lot of flowing lava, even lava lakes. The big cloud which can be seen at the bottom of this page leads to the prediction that a huge explosion did set off the eruption. It is embarrassing that 12 hours after it happened still NOBODY can give detailed information of this eruption. Additionally if the volcano is Dubbi volcano, then we do fear for the wellbeing of Afambo as this village (town ?) is very near the crater.

UPDATE 13/06 – 10:30 UTC : Loud explosions were heard in Afdera (Afdera is approx. 30 km from the volcanoes), across the border in Ethiopia, and ashfall is reported as far as Mekele in Tigray province (Mekele is approx. 200 km from the volcanoes). $$$

UPDATE 13/06 – 10:24 UTC : The international press is waking up as the ash cloud threatens airline traffic. No additional info however out of Eritrea and this will be the only source that counts. Apart from Eritrea the satellite companies (NASA, etc) have certainly HD images enabling them to locate the exact crater. For now, we still use the term “undecided”.

UPDATE 13/06 – 09:54 UTC : What a crazy situation! In trying to find more information in Eritrea on the ongoing eruption but even more on the extend of damage in and around Afambo, we could find only ….. yes, our own article! I hope that Eritrean news sources will try to get information out of Afambo soon. Why ? Is international help needed if damaged ? It takes many hours, even days before aid is organized and every hour lost is important in such cases.

UPDATE 13/06 – 09:29 UTC : Reader John Tucker did send us the following report (based on an Israeli source) :a Hebrew journal is reporting it as Nabro – I rab it through google translate: A cloud of volcanic ash from the volcano Anabro (Nabro), on the border of Ethiopia – Eritrea, makes his way to the north – west. Satellite photographs show that the last few hours the cloud is now over Sudan, in the Red Sea. According to certain forecasts, in a few days volcanic ash could reach Israel, located about 1,700 km from the volcano. In this case, there may be cancellation of flights from Israel Strip. [ http://www.masa.co.il/ ] click on the volcano photo

UPDATE 13/06 – 09:10 UTC : Thanks to our readers we have received the url of the Ash cloud advisory above Africa. Click this link or the picture. It links to the latest report of 06:00 AM UTC. A new report will be released in approx. 3 hours.

UPDATE 13/06 – 08:50 UTC : Why is almost NOBODY in the world reporting on this extraordinary event ??

UPDATE 13/06 – 08:46 UTC : We expect that some airlines will have to divert from their normal routes as the ash plume is extending further and further. Especially flights from Europe to East Africa are flying that route (at least i did last year).
Is the ash concentration in the clouds monitored above Africa ?

UPDATE 13/06 – 07:23 UTC : We are still guessing on which volcano erupted. Opinions change from Dubbi to Nabro. The satellite images are not convincing. The local press has not even mentioned this volcano eruption(at least not the ones we are following)

UPDATE 13/06 – 06:55 UTC : The initial explosion (see pictures below) creating a vast ash cloud has now gone into a normal eruption plume.

UPDATE 13/06 – 06:27 UTC : We truly thank our thousands of readers who have also contributed a lot to this report by giving tips of satellite images, etc. while we were resting for a couple of hours.

UPDATE 13/06 – 06:27 UTC : Volcano ash cloud is stretching now over more than 1,000 km (westerly direction) and has reached Sudan.

UPDATE 13/06 – 00:47 UTC : From now on we will have to wait for local reports, pictures, video’s etc.
We are very eager to get a confirmation that nobody was hurt and that no damage was inflicted during the earthquake and/or eruption.
Many scientists will board airplanes to take a close look at the volcano, take samples, etc.

UPDATE 13/06 – 00:15 UTC : This is a very recent Google earth picture (combined with satellite cloud image). The size of the cloud is 150 km on 50 km! (91 on 35 miles).

UPDATE 23:46 UTC : We are now convinced that the erupting volcano is the Nabro volcano (an official confirmation is still missing)

UPDATE 23:16 UTC : As long as we have no confirmation of local authorities we have to guess on the name of the erupting volcano. Dubbi volcano is one scenario as his activity could be traced to 1861. Based on the coordinates of the beginning of the eruption as well as the location of a number of the more powerful earthquakes, Pieter De Leeuw (Netherlands) has traced the eruption as probably coming from the Nabro volcano, a crater with a diameter of 8 km. We agree with him. Nabro volcano has no records of recent eruptions.

UPDATE 23:10 UTC : According to Global Volcanism Program, both Nabro and Dubbi belong to the Bidu volcanic complex

Nabro volcano, Eritrea - courtesy Google Earth

UPDATE 22:59 UTC : Earthquake-report.com wants to know as fast as possible the situation in Afambo. The continuous earthquakes may have been damaging. Depending the activity of the nearby Dubbi volcano, people in very nearby Afambo are at risk. We hope to receive OK signals soon, but as said earlier on, communications with this part of Eritrea will be very basic and it can take a while before the news reaches the outside world (if not cut off by the ongoing events).

UPDATE 22:45 UTC : This will be a very special volcano eruption because we expect that the eruption comes from the Dubbi volcano who had it’s latest recorded activity in 1861.

UPDATE 22:35 UTC : The satellite picture below clearly indicates that an eruption is going on in the area. Look at the upper right quarter.

Click here for the animated cloud cover in Ethiopia / Eritrea

We do appreciate the person from the Netherlands and a few other people who wrote us about the satellite pictures. Satellite pictures courtesy http://www.sat24.com.



UPDATE 22:02 UTC : @ earthquake-report.com we expect that it will take at least 12 hours before we can get a more precise picture of what happened. We will keep you updated just as we do with all other earthquakse and volcanic events that we are following up.

UPDATE 21:45 UTC : The earthquake intensity of the 5.7 magnitude earthquake (latest one) caused 451 people to feel a strong shaking and 17,000 people a moderate shaking (theoretical values)

UPDATE 21:44 UTC : As reported below, the last known eruption of one the volcanoes dates back to 1861(Dubbi volcano) and killed 106 people

The red point is the location of the first tremor - Dubbi volcano area

UPDATE 21:36 UTC : Some more information on the volcanic complex :
Mallahle is the central of three NE-SW-trending stratovolcanoes in the Danakil horst SW of Dubbi volcano, and lies SSW of Nabro volcano.
These two volcanoes, along with Bara Ale and Sork’Ale, form the Bidu volcanic complex. The complex Mallahle stratovolcano is truncated by a steep-walled 6-km-wide caldera. Mallahle is formed of rhyolitic lava flows and pyroclastics. Basaltic lava flows blanket the slopes of the
volcano. Recent obsidian flows are found on the NW flank of Mallahle and older obsidian flows were erupted on the northern caldera floor.
Flank spatter and scoria cones are most numerous on the western side of the volcano. Extensive ignimbrite deposits associated with the collapse of Mallahle and Nabro volcanoes blanket the countryside.

UPDATE 21:28 UTC : The 5.7 magnitudes can lead to serious damage if the epicenter is below or very near to Afambo (which seems to be nearby (based on the seismological data)) . We do not think that there will be injured people as the series started with moderate earthquakes and as people will stay on the streets after so many earthquakes. The current situation tends to become very dangerous.

UPDATE 21:23 UTC : A new Mw5.7 at a depth of 9km has been recorded in the same area. No record of damage so far.

UPDATE 21:03 UTC : Lucas Tavares reports in our Facebook page : I was studying about this volcanoes past hours. Maybe the shakes surrounds the Mallahle or Nabro Caldera, there isn’t any known eruptions of these volcanoes! Shakes are becoming stronger!

UPDATE 20:58 UTC : We have still no trace (as expected) of what is really going on. This last 5.4 earthquake can be damaging at the given shallow depth and when the epicenter is located below a village or town. As we are unsure of the exact epicenter (the error margin may be 10 to 30 km different than reported by the USGS) we have no certainty as yet.

UPDATE 20:56 UTC : The earthquakes are continuing with the last one as the strongest so far ( magnitude of 5.4 at a depth of 10 km).

UPDATE 20:33 UTC : We are more and more convinced that one of the nearby volcanoes went into an active state as the distance to the ridge fault is too big to create these kind of earthquakes. Additionally almost all the earthquakes are occurring near the volcano complex on the picture (courtesy Google Earth)

UPDATE 19:37 UTC : This unusual series of moderate earthquakes have also occurred a couple of months ago in the Gulf of Aden. The earthquakes are typical for separating irregular tectonic plates. The series in the Gulf of Aden had their epicenter in the immediate area of the ridge fault.
Due to the close-by volcanoes, an eruption pattern of the Dubbi volcano is still possible. The pre-eruption pattern of both the Icelandic and Chilean volcanoes from the last few weeks is also present here. Compared to Iceland and Chile, Eritrea has other concerns than looking to beautiful eruptions. We will follow up these events and will come back to you as soon as we can get more data ?
UPDATE 16:11 UTC : Other agencies are reporting totally different and less dangerous numbers : GFZ: 4.9 @ 43 km and EMSC 4.7 @ 200 km
Moderate shallow earthquake with an epicenter almost below Afambo.
Approx. 15 km from the Dubbi volcano. The peak of the Dubbi volcano is 1625 m. There have been four known eruptions. In 1400 lava was determined to have reached the Red Sea while in 1861 ash was thrown over 250 km from the volcano. Two further events were suspected between 1861 and the 20th century.

During the late afternoon and evening of June 12 2011, a series of moderate earthquake struck at first near Afambo in Eritrea and later 100 km more to the south in Ethiopia. At the moment of writing, we do not know whether these earthquake have a tectonic or a volcanic origin.

Other moderate earthquakes which occurred after the first earthquake which is described in detail

M 4.5 2011/06/12 21:37 Depth 15.0 km ERITREA – ETHIOPIA REGION
M 5.7 2011/06/12 21:03 Depth 9.9 km ERITREA – ETHIOPIA REGION
M 5.7 2011/06/12 20:32 Depth 10.1 km ERITREA – ETHIOPIA REGION
M 4.8 2011/06/12 19:44 Depth 9.9 km ERITREA – ETHIOPIA REGION
M 4.7 2011/06/12 19:37 Depth 10.1 km ERITREA – ETHIOPIA REGION
M 4.5 2011/06/12 18:01 Depth 10.1 km ETHIOPIA
M 5.0 2011/06/12 19:21 Depth 10.0 km ETHIOPIA
M 4.7 2011/06/12 17:47:21 13.538 41.588 Depth 10.0 km ERITREA - ETHIOPIA REGION
M 4.8 2011/06/12 17:18:10 13.381 41.764 Depth 9.9 km ERITREA - ETHIOPIA REGION
M 4.3 2011/06/12 16:33:12 13.507 41.722 Depth 10.0 km ERITREA - ETHIOPIA REGION
M 4.8 2011/06/12 16:24:44 13.436 41.682 Depth 10.0 km ERITREA - ETHIOPIA REGION
M 4.7 2011/06/12 16:12:03 13.397 41.734 Depth 10.0 km ERITREA - ETHIOPIA REGION
M 4.5 2011/06/12 16:09:30 13.443 41.696 Depth 2.9 km ERITREA - ETHIOPIA REGION

Most important Earthquake Data:
Magnitude : 5.1
UTC Time : Sunday, June 12, 2011 at 15:37:05 UTC
Local time at epicenter : Sunday, June 12, 2011 at 06:37:05 PM at epicenter
Depth (Hypocenter) : 10 km
Geo-location(s) :
Almost below Afambo, Eritrea
128 km (79 miles) WNW of Assab, Eritrea

Links to important maps
USGS Did You Feel It Map
Google satellite map of the area showing the kind of terrain the earthquake took place
USGS historic earthquakes map
USGS Seismic hazard map

QuakeSOS+ and QuakeSOS free are iPhone applications developed by Armand Vervaeck, the founder of Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is feeding the users with Earthquake Report news. The 0.99 US$ QuakeSOS+ version will support the activities of SOS Earthquakes.

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I did feel it – Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo siento – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه