Magnitude 7.3 - EAST OF THE KURIL ISLANDS

[Shiloh]

Source: http://earthquake.usgs.gov/eqcenter/...us2009bwa8.php

Magnitude 7.3 - EAST OF THE KURIL ISLANDS
2009 January 15 17:49:39 UTC

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Earthquake Details
Magnitude 7.3
Date-Time

* Thursday, January 15, 2009 at 17:49:39 UTC
* Friday, January 16, 2009 at 03:49:39 AM at epicenter

Location 46.888?N, 155.167?E
Depth 35 km (21.7 miles) set by location program
Region EAST OF THE KURIL ISLANDS
Distances

* 428 km (266 miles) S (190?) from Severo-Kuril'sk, Kuril Islands, Russia
* 725 km (451 miles) SSW (201?) from Petropavlovsk-Kamchatskiy, Russia
* 1787 km (1111 miles) NE (41?) from TOKYO, Japan

Location Uncertainty horizontal +/- 5.2 km (3.2 miles); depth fixed by location program
Parameters NST=161, Nph=161, Dmin=728.1 km, Rmss=0.82 sec, Gp= 36?,
M-type=regional moment magnitude (Mw), Version=6
Source

* U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver

Event ID us2009bwa8

[Shiloh]

Re: Magnitude 7.3 - EAST OF THE KURIL ISLANDS

Source: http://www.prh.noaa.gov/ptwc/message....15.180514.txt

TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
805 AM HST THU JAN 15 2009

TO - CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT - TSUNAMI INFORMATION

THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 0750 AM HST 15 JAN 2009
COORDINATES - 46.9 NORTH 155.2 EAST
LOCATION - EAST OF KURIL ISLANDS
MAGNITUDE - 7.5 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.

[AlaskaDenise]

Re: Magnitude 7.3 - EAST OF THE KURIL ISLANDS

There is also NO tsunami forecast for Alaska, either. The instruments along the Aleutian chain were involved in this forecast.
See: http://wcatwc.arh.noaa.gov/2009/01/1.../204177-01.pdf

.

[AlaskaDenise]

Re: Magnitude 7.3 - EAST OF THE KURIL ISLANDS

this earthquake caused many Alaskan seismographs to go "off the chart". See here for a clickable map of some seismographs.

If you go to the seismograph at Coldfoot (click on "COLD" near the top of the map) - you can see the waves from an earlier quake, plus the start of the Kuril Islands quake. This location is far enough away, that the lines aren't blended all over the graph. It looks as if it reached that graph at 17:51:30 - see the end of the steady green line.

The graph from St.Paul Islands (labeled SPIA) must have it's sensitivity turned down to not show wave action. It's above the Aleutian Islands. It's a nice small classical graph - you can easily make out the "P," "S", & longitudinal waves.

.

[AlaskaDenise]

Re: Magnitude 7.3 - EAST OF THE KURIL ISLANDS

I did the calculations for the earlier quakes shown on the Alaskan seismogrpahs - it's from the Loyalty Islands quake. It arrived at the Gambell (St. Lawrence Island) seismograph at about 07:39 UTC.

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