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9.0 Earthquake strikes Japan


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For the record the 9.5 Earthquake occurred in Chile in 1960 and the 9.2 in Alaska in 1964. The fault on which this shock occurred is a classic subduction zone megathrust fault hence the high magnitude.

Steve

It seems the subduction zone faults are most prone to big tsunamis too since they usually involve huge thrusts of earth upwards during the quake to displace the water.

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For the record the 9.5 Earthquake occurred in Chile in 1960 and the 9.2 in Alaska in 1964. The fault on which this shock occurred is a classic subduction zone megathrust fault hence the high magnitude.

Steve

Are those the two strongest earthquakes on record, Steve? I believe there was another 9+ in Portugal but that was a couple of centuries ago. And maybe one in China.

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It seems the subduction zone faults are most prone to big tsunamis too since they usually involve huge thrusts of earth upwards during the quake to displace the water.

This is a list of megathrust earthquakes.... the interesting thing is only one of these was among the top ten deadliest earthquakes (that was the 2004 Indonesian earthquake.) The Portugal earthquake from 1755 I referenced earlier is on this list as a 9.0

http://en.wikipedia....rust_earthquake

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JESUS....

TSUNAMI BULLETIN NUMBER 003

PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS

ISSUED AT 0730Z 11 MAR 2011

THIS BULLETIN APPLIES TO AREAS WITHIN AND BORDERING THE PACIFIC

OCEAN AND ADJACENT SEAS...EXCEPT ALASKA...BRITISH COLUMBIA...

WASHINGTON...OREGON AND CALIFORNIA.

... A WIDESPREAD TSUNAMI WARNING IS IN EFFECT ...

A TSUNAMI WARNING IS IN EFFECT FOR

JAPAN / RUSSIA / MARCUS IS. / N. MARIANAS / GUAM / WAKE IS. /

TAIWAN / YAP / PHILIPPINES / MARSHALL IS. / BELAU / MIDWAY IS. /

POHNPEI / CHUUK / KOSRAE / INDONESIA / PAPUA NEW GUINEA /

NAURU / JOHNSTON IS. / SOLOMON IS. / KIRIBATI / HOWLAND-BAKER /

HAWAII / TUVALU / PALMYRA IS. / VANUATU / TOKELAU / JARVIS IS. /

WALLIS-FUTUNA / SAMOA / AMERICAN SAMOA / COOK ISLANDS / NIUE /

AUSTRALIA / FIJI / NEW CALEDONIA / TONGA / MEXICO /

KERMADEC IS / FR. POLYNESIA / NEW ZEALAND / PITCAIRN /

GUATEMALA / EL SALVADOR / COSTA RICA / NICARAGUA / ANTARCTICA /

PANAMA / HONDURAS / CHILE / ECUADOR / COLOMBIA / PERU

http://www.prh.noaa.gov/hnl/tsunami_msgs/HEBTSUPAC.201103110932

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TSUNAMI MESSAGE NUMBER 3

NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI

931 PM HST THU MAR 10 2011

TO - CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT - TSUNAMI WARNING

A TSUNAMI WARNING IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT

0931 PM HST.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 0746 PM HST 10 MAR 2011

COORDINATES - 38.2 NORTH 142.5 EAST

LOCATION - NEAR EAST COAST OF HONSHU JAPAN

MAGNITUDE - 8.8 MOMENT

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER

DART 21413 30.5N 152.1E 0659Z 0.76M / 2.5FT 32MIN

HANASAKI HOKKAIDO J 43.3N 145.6E 0657Z 2.79M / 9.2FT 76MIN

DART 21401 42.6N 152.6E 0643Z 0.67M / 2.2FT 40MIN

DART 21418 38.7N 148.7E 0619Z 1.08M / 3.5FT 06MIN

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.

NOTE - DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY

ARE GENERALLY MUCH SMALLER THAN WOULD BE COASTAL

MEASUREMENTS AT SIMILAR LOCATIONS.

EVALUATION

A TSUNAMI HAS BEEN GENERATED THAT COULD CAUSE DAMAGE ALONG

COASTLINES OF ALL ISLANDS IN THE STATE OF HAWAII. URGENT ACTION

SHOULD BE TAKEN TO PROTECT LIVES AND PROPERTY.

A TSUNAMI IS A SERIES OF LONG OCEAN WAVES. EACH INDIVIDUAL WAVE

CREST CAN LAST 5 TO 15 MINUTES OR MORE AND EXTENSIVELY FLOOD

COASTAL AREAS. THE DANGER CAN CONTINUE FOR MANY HOURS AFTER THE

INITIAL WAVE AS SUBSEQUENT WAVES ARRIVE. TSUNAMI WAVE HEIGHTS

CANNOT BE PREDICTED AND THE FIRST WAVE MAY NOT BE THE LARGEST.

TSUNAMI WAVES EFFICIENTLY WRAP AROUND ISLANDS. ALL SHORES ARE AT

RISK NO MATTER WHICH DIRECTION THEY FACE. THE TROUGH OF A TSUNAMI

WAVE MAY TEMPORARILY EXPOSE THE SEAFLOOR BUT THE AREA WILL

QUICKLY FLOOD AGAIN. EXTREMELY STRONG AND UNUSUAL NEARSHORE

CURRENTS CAN ACCOMPANY A TSUNAMI. DEBRIS PICKED UP AND CARRIED

BY A TSUNAMI AMPLIFIES ITS DESTRUCTIVE POWER. SIMULTANEOUS HIGH

TIDES OR HIGH SURF CAN SIGNIFICANTLY INCREASE THE TSUNAMI HAZARD.

THE ESTIMATED ARRIVAL TIME IN HAWAII OF THE FIRST TSUNAMI WAVE IS

0259 AM HST FRI 11 MAR 2011

MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT.

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Why isn't the west coast of the US under some type of advisory? the west coast of South America has a tsunami warning and so does mexico...

The USGS is pretty good...they have often not issued advisories when neighboring agencies did....and they were correct. They said correctly in 2004 that no additional tsunamis were a threat in the indian ocean when the agencies out there were warning of more. They usually err on the side of caution. They've had several tsuanmi warnings that did nothing like the one in Hawaii last year.

They might issue one, but they are probably waiting for more data from buoys in the central PAC.

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The USGS is pretty good...they have often not issued advisories when neighboring agencies did....and they were correct. They said correctly in 2004 that no additional tsunamis were a threat in the indian ocean when the agencies out there were warning of more. They usually err on the side of caution. They've had several tsuanmi warnings that did nothing like the one in Hawaii last year.

They might issue one, but they are probably waiting for more data from buoys in the central PAC.

That makes sense, it just def looks awkward when you see mexico to chile under tsunami warning and US/Canada with nothing for right now

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