[Ed. Note: crossposted from WUWT. Hawaii experienced some low amplitude tsunami waves of generally less than one meter, although evacuations of some regions were ordered in advance last night.]

7.7 Earthquake off west coast of Canada, Tsunami warnings issued

Posted on October 27, 2012 by

An earthquake with magnitude 7.7 occurred near Prince Rupert, BC, Canada at 03:04:10.56 UTC on Oct 28, 2012. (This event has been reviewed by a seismologist.)

Map below:

Open map in new window  Epicenter

BULLETIN
PUBLIC TSUNAMI MESSAGE NUMBER 6
NWS WEST COAST/ALASKA TSUNAMI WARNING CENTER PALMER AK
1044 PM PDT SAT OCT 27 2012

THE ADVISORY HAS BEEN EXPANDED TO INCLUDE NORTHERN CALIFORNIA AND
SOUTHERN OREGON.

…THE TSUNAMI WARNING CONTINUES IN EFFECT FOR THE COASTAL
AREAS OF BRITISH COLUMBIA AND ALASKA FROM THE NORTH TIP OF
VANCOUVER ISLAND BRITISH COLUMBIA TO CAPE DECISION
ALASKA/LOCATED 85 MILES SE OF SITKA/…

…THE TSUNAMI ADVISORY IS MODIFIED TO INCLUDE THE COASTAL
AREAS OF CALIFORNIA AND OREGON FROM GUALALA POINT
CALIFORNIA/LOCATED 80 MILES NW OF SAN FRANCISCO/ TO
DOUGLAS-LANE COUNTY LINE OREGON/10 MILES SW OF FLORENCE/…

…THE TSUNAMI ADVISORY CONTINUES IN EFFECT FOR THE COASTAL
AREAS OF BRITISH COLUMBIA FROM THE WASHINGTON-BRITISH
COLUMBIA BORDER TO THE NORTH TIP OF VANCOUVER ISLAND
BRITISH COLUMBIA…

…THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
CALIFORNIA FROM THE CALIFORNIA-MEXICO BORDER TO GUALALA
POINT CALIFORNIA/LOCATED 80 MILES NW OF SAN FRANCISCO/…

…THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
OREGON AND WASHINGTON FROM DOUGLAS-LANE COUNTY LINE
OREGON/10 MILES SW OF FLORENCE/ TO THE WASHINGTON-BRITISH
COLUMBIA BORDER…

…THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
ALASKA FROM CAPE DECISION ALASKA/LOCATED 85 MILES SE OF
SITKA/ TO ATTU ALASKA…
And also:

BULLETIN
TSUNAMI MESSAGE NUMBER 3
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
709 PM HST SAT OCT 27 2012

TO – CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT – TSUNAMI WARNING

A TSUNAMI WARNING IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT
0709 PM HST. THIS UPGRADE IS DUE TO THE SEA LEVEL READINGS
RECEIVED AND THE RESULTING CHANGE IN THE HAWAII TSUNAMI
FORECAST.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME – 0504 PM HST 27 OCT 2012
COORDINATES – 52.8 NORTH 131.8 WEST
LOCATION – QUEEN CHARLOTTE ISLANDS REGION
MAGNITUDE – 7.7 MOMENT

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER
——————- —– —— —– ————— —–
DART 46404 45.9N 128.8W 0417Z 0.05M / 0.2FT 20MIN
LANGARA POINT BC 54.2N 133.1W 0424Z 0.20M / 0.7FT 26MIN
DART 46419 48.8N 129.6W 0346Z 0.06M / 0.2FT 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.

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
PM HST SAT 27 OCT 2012MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT.

WEHW40 PHEB 280804
TSUHWX
HIZ001>003-005>009-012>014-016>021-023>026-281004-
/O.CON.PHEB.TS.W.0001.000000T0000Z-000000T0000Z/

BULLETIN
TSUNAMI MESSAGE NUMBER 6
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1003 PM HST SAT OCT 27 2012

TO – CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT – TSUNAMI WARNING SUPPLEMENT

A TSUNAMI WARNING CONTINUES IN EFFECT FOR THE STATE OF HAWAII.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME – 0504 PM HST 27 OCT 2012
COORDINATES – 52.8 NORTH 131.8 WEST
LOCATION – QUEEN CHARLOTTE ISLANDS REGION
MAGNITUDE – 7.7 MOMENT

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER
——————- —– —— —– ————— —–
SITKA AK 57.1N 135.3W 0542Z 0.09M / 0.3FT 30MIN
CRESCENT CITY CA 41.7N 124.2W 0736Z 0.42M / 1.4FT 24MIN
DART 46419 48.8N 129.6W 0344Z 0.07M / 0.2FT 20MIN
ARENA COVE CA 38.9N 123.7W 0633Z 0.32M / 1.1FT 06MIN
WINTER HARBOUR BC 50.5N 128.0W 0413Z 0.23M / 0.8FT 30MIN
DART 46404 45.9N 128.8W 0417Z 0.05M / 0.2FT 20MIN
LANGARA POINT BC 54.2N 133.1W 0424Z 0.20M / 0.7FT 26MIN

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
1028 PM HST SAT 27 OCT 2012

Tsunami warning lifted for Hawaii
State downgraded to tsunami advisory
UPDATED 2:45 AM HST Oct 28, 2012

Hawaii awaits all-clear from tsunami warning

HONOLULU —A tsunami warning for the state of Hawaii was lifted just after 1 a.m. Sunday, according to the Pacific Tsunami Warning Center.

A tsunami warning was issued 7 p.m. Saturday following a 7.7 magnitude quake off of the west coast of Canada near British Columbia Saturday evening at 5:04 p.m.

The quake struck on the Queen Charlotte Islands Region of British Columbia, 452 miles northwest of Vancouver and 164 miles south of Alaska.

A tsunami warning was immediately implemented for the entire western seaboard of the United States and Canada, stretching from Alaska to the California/Mexico border. That was reduced to a regional warning to areas immediately surrounding the earthquake.

The Hawaii alert was issued at 7:09 p.m. after further buoy readings indicated that Hawaii could be impacted.

The tsunami advisory was issued at 12:54 a.m. Sunday.  Sea level changes and strong current may still occur along all coasts that could be a hazard to swimmers and boaters as well as people near the shore at beaches in harbors and marinas.  This threat may continue for several hours.

City officials are suggesting people stay out of the water during the tsunami advisory.

The state will have harbors closed during the tsunami advisory.

State officials also say that three flights were canceled on Oahu and five flights canceled on Maui due to the tsunami warning.