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7.4 magnitude earthquake strikes off coast of Alaska.


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Don't know why they bother with tsunami warnings for a 7.4.. has there ever been a recorded one for a quake that weak?

Yes, there was a tsunami with the 7.2 foreshock of the big Japan earthquake. Additionally, earthquakes in the 7.0+ range cause local tsunamis quite frequently in Indonesia and the Solomons. Also local tsunamis occurred along the CA coast off San Luis Obispo in 1812 and 1927 following shocks in the 7.5 range.

Steve

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To: U.S. West Coast, Alaska, and British Columbia coastal regions

From: NOAA/NWS/West Coast and Alaska Tsunami Warning Center

Subject: Tsunami Warning Cancellation #3 issued 06/23/2011 at 8:19PM AKDT

The Tsunami Warning is canceled for the coastal areas from Unimak Pass, Alaska (80 miles NE of Dutch Harbor) to Amchitka Pass, Alaska (125 miles W of Adak).

NO destructive tsunami has been recorded, and NO tsunami danger exists along the coasts of the U.S. west coast states, Alaska, and British Columbia. Local authorities can assume all clear upon receipt of this message.

At 7:10 PM Alaskan Daylight Time on June 23, an earthquake with preliminary magnitude 7.3 occurred 20 miles/32 Km southeast of Amukta Pass, Alaska . (Refer to the United States Geological Survey for official earthquake parameters.)

Pacific coastal regions outside California, Oregon, Washington, British Columbia, and Alaska should refer to the Pacific Tsunami Warning Center messages for information on the event.

This will be the last West Coast/Alaska Tsunami Warning Center message issued for this event. To repeat, NO tsunami warning, watch or advisory is in effect for the U.S. West coast states, Alaska, and British Columbia. See the WCATWC web site for basic tsunami information, safety rules, and a tsunami travel time map and table. (NOTE: Travel time maps and tables indicate forecasted times only, not that a wave was generated.)

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