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Date-Time Wednesday, September 14, 2011 at 18:10:07 UTC
Wednesday, September 14, 2011 at 09:10:07 AM at epicenter
Location 53.138°N, 173.022°E
Depth 1 km (~0.6 mile) (poorly constrained)
Region NEAR ISLANDS, ALEUTIAN ISLANDS, ALASKA
Distances 27 km (16 miles) NNW of Attu, Alaska
87 km (54 miles) WNW of Shemya Island, Alaska
3180 km (1975 miles) W of WHITEHORSE, Yukon Territory, Canada
3236 km (2010 miles) NE of TOKYO, Japan
Location Uncertainty horizontal +/- 16.8 km (10.4 miles); depth +/- 4.5 km (2.8 miles)
Parameters NST=250, Nph=250, Dmin=85.7 km, Rmss=0.83 sec, Gp=115°,
M-type=regional moment magnitude (Mw), Version=6
Source Magnitude: USGS NEIC (WDCS-D)
Location: USGS NEIC (WDCS-D)
Event ID usc0005ucf
To: U.S. West Coast, Alaska, and British Columbia coastal regions
From: NOAA/NWS/West Coast and Alaska Tsunami Warning Center
Subject: Tsunami Information Statement issued 09/14/2011 at 10:15AM AKDT
At 10:10 AM Alaskan Daylight Time on September 14, an earthquake with preliminary magnitude 6.1 occurred 15 miles/24 Km southwest of Attu I., Alaska .
The magnitude is such that a tsunami IS NOT EXPECTED. However, in coastal areas of intense shaking, locally generated tsunamis can be triggered by underwater landslides. This will be the only WCATWC message issued for this event.
The location and magnitude are based on preliminary information. Further information will be issued by the United States Geological Survey or the appropriate regional seismic network.