WCATWC: TSUNAMI BULLETIN NO. 8 – 2011 MARCH 11 – 0443 UTC

For more information, please see the latest bulletins at the West Coast & Alaska Tsunami Warning Center.

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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 and Advisory #8 issued 03/11/2011 at 4:43AM PST

The warning and advisory areas remain the same. More 
observations are included below.

The Tsunami Warning continues in effect for the coastal areas 
of California and Oregon from Point Concepcion, California to
the Oregon-Washington border.

The Tsunami Warning continues in effect for the coastal areas 
of Alaska from Amchitka Pass, Alaska (125 miles W of Adak) to 
Attu, Alaska.

The Tsunami Advisory continues in effect for the coastal areas 
of California from the California-Mexico border to Point 
Concepcion, California.

The Tsunami Advisory continues in effect for the coastal areas
of Washington, British Columbia and Alaska from the Oregon-
Washington border to Amchitka Pass, Alaska (125 miles W of Adak).

A Tsunami Warning means that 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. Those feeling the earth shake, 
seeing unusual wave action, or the water level rising 
or receding may have only a few minutes before the tsunami 
arrival and should move immediately. Homes and small 

buildings are not designed to withstand tsunami impacts. 
Do not stay in these structures.

All residents within the warned area should be alert for 
instructions broadcast from their local civil authorities.
A tsunami has been recorded.

A Tsunami Advisory means that a tsunami capable of producing 
strong currents or waves dangerous to persons in or very near 
the water is expected. Significant, widespread inundation is 
not expected for areas under an advisory. Currents may be 
hazardous to swimmers, boats, and coastal structures and may 
continue for several hours after the initial wave arrival.

At 9:46 PM Pacific Standard Time on March 10, an earthquake with
preliminary magnitude 8.9 occurred near the east coast of Honshu,
Japan . (Refer to the United States Geological Survey for official
earthquake parameters.) This earthquake has generated a tsunami
which could cause damage to coastal regions in a warning or 
advisory. Estimated tsunami arrival times and maps along with 
safety rules and other information can be found on the WCATWC 
web site.

Measurements or reports of tsunami activity:

 Location                   Lat.   Lon.    Time        Amplitude
 ------------------------  -----  ------  -------     -----------

 Shemya  AK                52.7N  174.1E  1130UTC   05.1FT/01.56M
 Adak  AK                  51.9N  176.6W  1112UTC   01.5FT/00.46M
 Boso  Japan               34.8N  140.8E  0600UTC   02.5FT/00.75M
 Naha  Japan               26.2N  127.7E  1022UTC   01.6FT/00.49M
 Ofunato  Japan            39.0N  141.8E  0603UTC   10.7FT/03.25M
 Omaezaki  Japan           34.6N  138.2E  0809UTC   04.6FT/01.39M
 Tokai  Japan              33.8N  137.6E  0649UTC   00.8FT/00.23M
 Tosashimizu  Japan        32.8N  132.9E  0753UTC   03.0FT/00.91M
 Kwajalein  Marshall Isl    8.7N  167.7E  1049UTC   01.0FT/00.30M
 Midway Is.  USA           28.2N  177.4W  1044UTC   05.1FT/01.55M
 Wake Is.  USA             19.3N  166.6E  0918UTC   01.7FT/00.52M
 Legaspi  Philippines      13.2N  123.8E  1020UTC   01.1FT/00.32M
 Dutch Harbor  AK          53.9N  166.5W  1134UTC   01.6FT/00.48M
 Nikolski  AK              52.9N  168.9W  1156UTC   01.4FT/00.41M
 French Frigate Shoals     23.5N  166.2W  1211UTC   01.5FT/00.45M
 St Paul Is.  AK           57.1N  170.3W  1225UTC   02.0FT/00.61M

Time - Time of measurement.
Amp. - Tsunami amplitudes are measured relative to normal sea level.
It is NOT crest-to-trough wave height. Values are given in both
meters (M) and feet (FT).

TSUNAMI AMPLITUDES ARE EXPECTED TO PEAK TWO TO THREE HOURS AFTER
INITIAL ARRIVAL ALONG THE NORTH AMERICAN COAST. FORECAST TSUNAMI
AMPLITUDES ARE AVAILABLE ON THE WCATWC WEB SITE WCATWC.ARH.NOAA.GOV.
Tsunamis can be dangerous waves that are not survivable. Wave heights
are amplified by irregular shoreline and are difficult to forecast.
Tsunamis often appear as a strong surge and may be preceded by a 
receding water level. Mariners in water deeper than 600 feet should
not be affected by a tsunami. Wave heights will increase rapidly as
water shallows. Tsunamis are a series of ocean waves which can be 
dangerous for several hours after the initial wave arrival. DO NOT
return to evacuated areas until an all clear is given by local 
civil authorities.

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 message will be updated in 60 minutes or sooner if the situation 
warrants. The tsunami message will remain in effect until further notice. 
For further information stay tuned to NOAA Weather Radio, your local TV 
or radio stations, or see the WCATWC web site.

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