U.S. West Coast, Alaska, and British Columbia coastal regions
NOAA/NWS/West Coast and Alaska
Tsunami Warning Center
Tsunami Warning and Advisory
#7 issued 03/11/2011 at 3:39AM PST
The tsunami warning and advisory regions have not changed.
More tsunami observations are included.
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
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
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
along with safety rules
and other information
can be found on the WCATWC
Measurements or reports of tsunami activity:
Location Lat. Lon. Time Amplitude
Time - Time of measurement.
------------------------ ----- ------ ------- -----------
Shemya AK 52.7N 174.1E 1038UTC 03.5FT/01.07M
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 1023UTC 01.5FT/00.46M
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
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
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
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.
Link to Standard Warning Message
Link to Public Warning Message
Link to XML/CAP Message
Link to Printable Message