Friday, 24 June 2011

7.4 Preliminary Magnitude Earthquake in Alaksa, Tsunami Warning

7.4 Earthquake hits Alaskan island: Tsunami warning issued

By IBTimes Staff Reporter | June 24, 2011 1:57 AM EDT

The West Coast and Alaska Tsunami Warning Center issued a tsunami warning for the coastal areas of Alaska on Thursday evening after a magnitude 7.4 earthquake was recorded in the Pacific Ocean off Alaska.

The earthquake occurred 20 miles southeast of Amukta Pass, Alaska, and stuck at a depth of about 40 kilometers in the ocean, the United States Geological Survey said.

Earthquakes of this magnitude are known to generate tsunamis, said the Alaska Tsunami Warning Center, asking residents within the warned area to be alert.

“All coastal residents in the warning area who are near the beach or in low-lying regions should move immediately inland to higher ground and away from all harbors and inlets including those sheltered directly from the sea,” it said.

The center warned that if residents are feeling the earth shake, seeing unusual wave action, or the water level rising or receding, they may have only a few minutes before the tsunami arrival and should move immediately.

The tsunami warning is in effect from Unimak Pass (80 miles NE of Dutch Harbor) to Amchitka Pass (125 miles W of Adak) in Alaska, while coastal areas of California, Oregon, Washington and British Columbia are on the watch.

A few maps from USGS and other government agencies below demonstrate estimated tsunami arrival time, the location of the earthquake and the areas under a tsunami warning, advisory or watch status:

The map shows the location of the earthquake.
The map shows the location of the earthquake.



Tsunami warning after quake hits off Alaska


A tsunami warning has been issued for Alaska after a 7.4-magnitude earthquake hit in the Pacific Ocean.

A tsunami warning has been issued for Alaska after a 7.4-magnitude earthquake hit in the Pacific Ocean.

A tsunami warning has been issued for Alaska after a 7.4-magnitude earthquake hit in the Pacific Ocean, 172 kilometres east of Atka in Alaska, at a depth of about 40km, the US Geological Survey (USGS) said.

The Bureau of Meteorology (BOM) says there is no tsunami threat for Australia at this stage

The quake on the Fox Islands - 163 kilometres east of the tiny fishing port of Atka - stuck at 6:09pm local time, the USGS said in a statement.

There were no immediate reports of damage or injuries.

The West Coast and Alaska Tsunami Warning Centre said a tsunami warning was now in effect for the coastal areas of Alaska.

Reuters


Earthquake Rocks Aleutians, Sparks Fear of Tsunami

By Bill Deger, Meteorologist
Jun 23, 2011; 10:54 PM ET

A magnitude 7.4 earthquake rocked the Aleutian Islands of Alaska Thursday evening, prompting officials to issue a tsunami warning for parts of the coast of Alaska.

According to the USGS, the quake was centered 39 miles southwest of Amukta Island, Alaska, at a depth of 29.1 miles. It struck at 6:09 p.m. local (Aleutian) time, or 11:09 p.m. Eastern time.

A tsunami warning was issued a short time thereafter for a portion of the Alaskan coast extending from Unimak Pass to Amchitka Pass. The first waves are projected to reach Adak, Alaska, at around 8:12 p.m. local (Alaska Daylight) time, or 12:12 a.m. Eastern time.

Adak is a city with a population of just over 300 located in the western Aleutians.

There have been no immediate reports of any damage from the earthquake or of any tsunamis at this time.

Stay tuned for updates on this earthquake and potential tsunami.


A preliminary magnitude 7.4 earthquake has hit the Aleutian and Fox Islands off the coast of Alaska.

The Pacific Tsunami Warning Center says there's no destructive widespread tsunami expected, but earthquakes of this size can sometimes generate local tsunamis along coasts 100 kilometers from the quake.

The National Weather Service says a tsunami warning is in effect for the coastal areas of Alaska from Unimak Pass, 80 miles NE of Dutch Harbor, to Amchitka Pass, 125 miles West of Adak.

This area is located in the earthquake "ring of fire", in the Bering Sea.

A tsunami warning was in effect after major earthquake with a 7.4 magnitude hit in the Pacific Ocean late Thursday, about 107 miles east of Atka, Alaska.

There were no immediate reports of injury or damage.

The quake hit Thursday 06:09:39 PM at its epicenter.



Read more: http://www.cbsnews.com/stories/2011/06/23/501364/main20073902.shtml#ixzz1QA8G7avM


Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude7.4
Date-Time
Location52.042°N, 171.842°W
Depth46.8 km (29.1 miles)
RegionFOX ISLANDS, ALEUTIAN ISLANDS, ALASKA
Distances64 km (39 miles) SW of Amukta Island, Alaska
103 km (64 miles) SW of Yunaska Island, Alaska
1677 km (1042 miles) WSW of Anchorage, Alaska
2429 km (1509 miles) W of WHITEHORSE, Yukon Territory, Canada
Location Uncertaintyhorizontal +/- 20.2 km (12.6 miles); depth +/- 11 km (6.8 miles)
ParametersNST=283, Nph=283, Dmin=228.2 km, Rmss=0.97 sec, Gp= 61°,
M-type=regional moment magnitude (Mw), Version=6
Source
  • USGS NEIC (WDCS-D)
Event IDusc0004f5m



globe showing location of 10-degree map
10-degree map showing recent earthquakes