7.2 Magnitude Earthquake Offshore Honshu Japan

tsunami update-

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER

OFUNATO HONSHU JP 39.0N 141.8E 0311Z 0.54M / 1.8FT 12MIN

LAT – LATITUDE (N-NORTH, S-SOUTH)

LON – LONGITUDE (E-EAST, W-WEST)

TIME – TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)

AMPL – TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.

IT IS …NOT… CREST-TO-TROUGH WAVE HEIGHT.

VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).

PER – PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION

SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY HAVE

BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER. FOR

THOSE AREAS – WHEN NO MAJOR WAVES ARE OBSERVED FOR TWO HOURS

AFTER THE ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE NOT

OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME

THE THREAT IS PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN

CONTINUE FOR SEVERAL HOURS DUE TO THE CONTINUING SEA LEVEL

CHANGES AND RAPID CURRENTS. AS LOCAL CONDITIONS CAN CAUSE A WIDE

VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION MUST

BE MADE BY LOCAL AUTHORITIES.

NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE PACIFIC

ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL NON-DESTRUCTIVE

SEA LEVEL CHANGES LASTING UP TO SEVERAL HOURS.

THIS WILL BE THE FINAL BULLETIN ISSUED FOR THIS EVENT UNLESS

ADDITIONAL INFORMATION BECOMES AVAILABLE.

THE JAPAN METEOROLOGICAL AGENCY MAY ALSO ISSUE TSUNAMI MESSAGES

FOR THIS EVENT TO COUNTRIES IN THE NORTHWEST PACIFIC AND SOUTH

CHINA SEA REGION. IN CASE OF CONFLICTING INFORMATION… THE

MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS

FOR ALASKA…BRITISH COLUMBIA…WASHINGTON…OREGON…CALIFORNIA.

http://www.weather.gov/ptwc/text.php?id=pacific.2011.03.09.035716

update: aftershocks

MAG UTC DATE-TIME

y/m/d h:m:s LAT

deg LON

deg DEPTH

km Region

MAP 5.3 2011/03/09 04:45:54 38.543 142.740 27.0 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.7 2011/03/09 04:37:03 38.666 142.991 25.5 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 04:32:10 38.727 143.001 32.1 OFF THE EAST COAST OF HONSHU, JAPAN

MAP 4.8 2011/03/09 04:15:39 38.857 142.658 12.6 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 04:05:53 38.870 142.420 10.9 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.0 2011/03/09 03:19:00 38.795 142.962 19.9 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 5.2 2011/03/09 03:08:35 38.339 143.097 24.4 OFF THE EAST COAST OF HONSHU, JAPAN

MAP 5.6 2011/03/09 02:57:16 38.402 142.825 17.5 NEAR THE EAST COAST OF HONSHU, JAPAN

MAP 7.2 2011/03/09 02:45:18 38.510 142.792 14.1 NEAR THE EAST COAST OF HONSHU, JAPAN

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/140_40_eqs.php

Magnitude 7.2 – OFF THE EAST COAST OF HONSHU, JAPAN

2011 March 09 02:45:17 UTC

Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude 7.2 (Preliminary magnitude — update expected within 15 minutes)
Date-Time
  • Wednesday, March 09, 2011 at 02:45:17 UTC
  • Wednesday, March 09, 2011 at 12:45:17 PM at epicenter
Location 38.300°N, 143.300°E
Depth 10 km (6.2 miles) set by location program
Region OFF THE EAST COAST OF HONSHU, JAPAN
Distances
  • 211 km (131 miles) E (88°) from Sendai, Honshu, Japan
  • 245 km (152 miles) SE (129°) from Morioka, Honshu, Japan
  • 252 km (156 miles) NE (56°) from Iwaki, Honshu, Japan
  • 430 km (267 miles) NE (46°) from TOKYO, Japan
Location Uncertainty Error estimate not available
Parameters NST= 6, Nph=0, Dmin=0 km, Rmss=0 sec, Gp=205°,
M-type=”moment” magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=B
Source
Event ID pt11068000

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/pt11068000.php

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 #1 issued 03/8/2011 at 6:55PM PST

A strong earthquake has occurred, but a tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, or Alaska coast. NO tsunami warning, watch or advisory is in effect for these areas.

Based on the earthquake magnitude, location and historic tsunami records, a damaging tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, and Alaska coasts. At coastal locations which have experienced strong ground shaking, local tsunamis are possible due to underwater landslides.

At 6:45 PM Pacific Standard Time on March 8, an earthquake with preliminary magnitude 7.2 occurred off the east coast of Honshu, Japan . (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 only statement issued for this event by the West Coast/Alaska Tsunami Warning Center unless conditions warrant. 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.)

http://wcatwc.arh.noaa.gov/2011/03/09/lhrrnh/01/messagelhrrnh-01.htm

000
WEHW42 PHEB 090255
TIBHWX
HIZ001>003-005>009-012>014-016>021-023>026-090455-
TSUNAMI INFORMATION STATEMENT NUMBER   1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
455 PM HST TUE MAR 08 2011
TO - CIVIL DEFENSE IN THE STATE OF HAWAII
SUBJECT - TSUNAMI INFORMATION STATEMENT
THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
   ORIGIN TIME - 0445 PM HST 08 MAR 2011
   COORDINATES - 38.3 NORTH  143.3 EAST
   LOCATION    - OFF EAST COAST OF HONSHU  JAPAN
   MAGNITUDE   - 7.2  MOMENT
EVALUATION
 BASED ON ALL AVAILABLE DATA A DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS
 NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII. REPEAT. A
 DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO
 TSUNAMI THREAT TO HAWAII.
THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.

http://www.weather.gov/ptwc/text.php?id=hawaii.2011.03.09.025534

Tsunami Warnings/Advisories

Tsunami Information Estimated Tsunami Arrival Time and Height High Tide Time and Estimated Tsunami Arrival Time at each place Tsunami Observations

Notes

To the text

Occurred at 11:45 JST 09 Mar 2011

Region name Sanriku Oki

Depth about 10km

Magnitude 7.2

Click the map to zoom in

Tsunami Forecast Region Classification of Tsunami Warning/Advisory

PACIFIC COAST OF AOMORI PREF. TSUNAMI ADVISORY

IWATE PREF. TSUNAMI ADVISORY

MIYAGI PREF. TSUNAMI ADVISORY

FUKUSHIMA PREF. TSUNAMI ADVISORY

Tsunami Warning/Advisory

Issued at 11:48 JST 09 Mar 2011

******************Headline******************

Tsunami Attension has been issued.

PACIFIC COAST OF TOHOKU

*******************Text********************

Tsunami Advisory

<Tsunami Advisory>

PACIFIC COAST OF AOMORI PREF.

IWATE PREF.

MIYAGI PREF.

FUKUSHIMA PREF.

***********About Tsunami Forecast************

<Tsunami Advisory>

Tsunami height is expected to be about 0.5 meters, Pay attention to tsunamis.

 http://www.jma.go.jp/en/tsunami/
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2 Responses to “7.2 Magnitude Earthquake Offshore Honshu Japan”

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