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Tsunami warnings, advisories, issued for Southeast Alaska, Hawaii
Published: 10/27/2012 20:31:45
Updated: 10/28/2012 02:54:10

Warning map for tsunami caused by 7.7 earthquake off BC coast on October 27, 20
Warning map for tsunami caused by 7.7 earthquake off BC coast on October 27, 20 (WCATWC)

Estimated travel & arrvial times for tsunami caused by 7.7 earthquake off BC coast on October 27, 2012
Estimated travel & arrvial times for tsunami caused by 7.7 earthquake off BC coast on October 27, 2012 (WCATWC & KATH-TV)

Estimated wave amplitudes for tsunami caused by 7.7 earthquake off BC coast on October 27, 20
Estimated wave amplitudes for tsunami caused by 7.7 earthquake off BC coast on October 27, 20 (WCATWC)

Related:
7.2 Magnitude Earthquake Prompts Brief Tsunami Warning For Areas of Aleutians

Massive Earthquake in Japan Triggers Tsunami Warnings Across Pacific Including Alaska

Magnitude 4.6 earthquake hits Southeast Alaska

The National Weather Service issued a tsunami warning for much of Southeast Alaska and British Columbia due to a magnitude 7.7 earthquake near Queen Charlotte Island BC at 7:04 PM ADT Saturday. The warning was downgraded to an advisory around 10:20 PM, and cancelled for Alaska shortly before midnight.

The Alaska Emergency Alert System was activated multiple times throughout the evening to warn residents across the Alaskan coastline.

A tsunami of under a foot was measured by the National Weather Service in various areas of the region:


MEASUREMENTS OR REPORTS OF TSUNAMI ACTIVITY

LOCATION LAT LON TIME AMPL
------------------------ ----- ------ ------- -----------
DART46419PT NW SEATTLE 48.8N 129.6W 0345UTC 00.2FT/00.07M
CRAIG AK 55.5N 133.1W 0427UTC 00.4FT/00.11M
PORT ALEXANDER AK 56.2N 134.6W 0533UTC 00.4FT/00.14M
WINTER HARBOUR BC 50.7N 128.3W 0400UTC 00.5FT/00.16M
SITKA AK 57.1N 135.3W 0425UTC 00.3FT/00.09M
ELFIN COVE AK 58.2N 136.3W 0448UTC 00.2FT/00.07M
SITKA AK 57.1N 135.3W 0525UTC 00.3FT/00.09M
YAKUTAT AK 59.5N 139.7W 0523UTC 00.4FT/00.12M
CHARLESTON OR 43.3N 124.3W 0524UTC 00.3FT/00.09M
GARIBALDI OR 45.6N 123.9W 0515UTC 00.2FT/00.05M
LA PUSH WA 47.5N 124.4W 0448UTC 00.4FT/00.13M
NEAH BAY WA 48.4N 124.6W 0530UTC 00.3FT/00.10M
PORT ORFORD OR 42.7N 124.5W 0519UTC 00.5FT/00.14M
SOUTH BEACH OR 44.6N 124.0W 0524UTC 00.3FT/00.09M
WESTPORT WA 46.9N 124.1W 0514UTC 00.3FT/00.09M
YAKUTAT AK 59.5N 139.7W 0520UTC 00.3FT/00.08M
ARENA COVE CA 38.9N 123.7W 0558UTC 00.5FT/00.17M
CRESCENT CITY CA 41.7N 124.2W 0555UTC 00.6FT/00.19M


The National Weather Service also issued a TSUNAMI ADVISORY for the area south of the Warning for the BC, Washington, Oregon and California coastlines.

A TSUNAMI WARNING has been issued for the state of Hawaii.

Bulletins from the West Coast & Alaska Tsunami Warning Center and Pacific Warning centers are copied below.


--
TSUNAMI MESSAGE NUMBER 12
NWS WEST COAST/ALASKA TSUNAMI WARNING CENTER PALMER AK
349 AM PDT SUN OCT 28 2012

THE ALERT LEVELS REMAIN THE SAME IN THIS MESSAGE.

...THE TSUNAMI ADVISORY CONTINUES IN EFFECT FOR THE COASTAL
AREAS OF CALIFORNIA FROM GUALALA POINT CALIFORNIA/LOCATED
80 MILES NW OF SAN FRANCISCO/ TO THE OREGON-CALIFORNIA
BORDER...

...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 - WASHINGTON - BRITISH COLUMBIA AND ALASKA FROM THE
OREGON-CALIFORNIA BORDER TO ATTU ALASKA...

RECOMMENDED ACTIONS
A TSUNAMI HAS BEEN GENERATED WHICH IS EXPECTED TO IMPACT THE
ADVISORY REGIONS LISTED IN THE HEADLINE. PEOPLE IN LOW-LYING
COASTAL AREAS SHOULD BE ALERT TO INSTRUCTIONS FROM THEIR LOCAL
EMERGENCY OFFICIALS. EVACUATIONS ARE ONLY ORDERED BY EMERGENCY
RESPONSE AGENCIES.
- IF IN A TSUNAMI ADVISORY COASTAL AREA MOVE OUT OF
THE WATER... OFF THE BEACH AND OUT OF HARBORS AND MARINAS.

MEASUREMENTS OR REPORTS OF TSUNAMI ACTIVITY

LOCATION LAT LON TIME AMPL
------------------------ ----- ------ ------- -----------
CRAIG AK 55.5N 133.1W 0446UTC 00.3FT/00.10M
PORT ALEXANDER AK 56.2N 134.6W 0533UTC 00.5FT/00.14M
SITKA AK 57.1N 135.3W 0730UTC 00.4FT/00.12M
ELFIN COVE AK 58.2N 136.3W 0448UTC 00.2FT/00.07M
YAKUTAT AK 59.5N 139.7W 0732UTC 00.5FT/00.14M
SEWARD AK 60.1N 149.4W 0600UTC 00.5FT/00.16M
KODIAK AK 57.7N 152.5W 0650UTC 00.4FT/00.13M
SAND POINT AK 55.3N 160.5W 0744UTC 00.3FT/00.08M
DUTCH HARBOR AK 53.9N 166.5W 0755UTC 00.1FT/00.04M
NIKOLSKI AK 52.9N 168.9W 0753UTC 00.2FT/00.06M
ATKA AK 52.2N 174.2W 0831UTC 00.5FT/00.14M
WINTER HARBOUR BC 50.7N 128.3W 0746UTC 00.8FT/00.24M
NEAH BAY WA 48.4N 124.6W 0530UTC 00.3FT/00.10M
PORT ANGELES WA 48.1N 123.4W 0640UTC 00.4FT/00.11M
LA PUSH WA 47.5N 124.4W 0448UTC 00.4FT/00.13M
WESTPORT WA 46.9N 124.1W 0550UTC 00.3FT/00.10M
GARIBALDI OR 45.6N 123.9W 0515UTC 00.2FT/00.05M
SOUTH BEACH OR 44.6N 124.0W 0524UTC 00.3FT/00.09M
CHARLESTON OR 43.3N 124.3W 0702UTC 00.4FT/00.12M
PORT ORFORD OR 42.7N 124.5W 0841UTC 00.8FT/00.23M
CRESCENT CITY CA 41.7N 124.2W 0914UTC 01.5FT/00.46M
NORTH SPIT CA 40.8N 124.2W 0626UTC 00.5FT/00.15M
ARENA COVE CA 38.9N 123.7W 0637UTC 01.3FT/00.41M
POINT REYES CA 38.0N 123.0W 0905UTC 00.8FT/00.25M
SAN FRANCISCO CA 37.8N 122.5W 0802UTC 00.5FT/00.14M
MONTEREY HARBOR CA 36.6N 121.9W 0738UTC 00.4FT/00.13M
PORT SAN LUIS CA 35.2N 120.8W 0810UTC 00.9FT/00.27M
LA JOLLA CA 32.9N 117.3W 0742UTC 00.2FT/00.06M
MOKULOE OAHU HI 21.4N 157.8W 0854UTC 00.2FT/00.08M
NAWILWILI HI 22.0N 159.4W 0851UTC 00.1FT/00.03M
HILO HI 19.7N 155.1W 1013UTC 01.2FT/00.37M
KAHULUI MAUI HI 20.9N 156.5W 0900UTC 02.5FT/00.76M
KAWAIHAE HI 20.0N 155.8W 0931UTC 01.9FT/00.56M
HALEIWA HI 21.6N 158.1W 0855UTC 01.4FT/00.43M
HONOLULU OAHU HI 21.3N 157.9W 0905UTC 00.5FT/00.15M
MAKAPUU HI 21.3N 157.7W 0934UTC 01.3FT/00.41M

TIME - TIME OF MEASUREMENT
AMPL - 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/.

PRELIMINARY EARTHQUAKE PARAMETERS
MAGNITUDE - 7.7
TIME - 1904 AKDT OCT 27 2012
2004 PDT OCT 27 2012
0304 UTC OCT 28 2012
LOCATION - 52.9 NORTH 131.9 WEST
25 MILES/40 KM S OF SANDSPIT BRITISH COLUMBIA
385 MILES/620 KM SE OF JUNEAU ALASKA
DEPTH - 12 MILES/19 KM

TSUNAMI ADVISORIES MEAN THAT A TSUNAMI CAPABLE OF PRODUCING
STRONG CURRENTS OR WAVES DANGEROUS TO PEOPLE 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.

PACIFIC COASTAL REGIONS OUTSIDE CALIFORNIA/ OREGON/ WASHINGTON/
BRITISH COLUMBIA AND ALASKA SHOULD REFER TO THE PACIFIC TSUNAMI
WARNING CENTER MESSAGES FOR INFORMATION ON THIS EVENT AT
PTWC.WEATHER.GOV.

THIS MESSAGE WILL BE UPDATED IN 60 MINUTES OR SOONER IF
THE SITUATION WARRANTS. THE TSUNAMI MESSAGE WILL REMAIN IN EFFECT
UNTIL FURTHER NOTICE. REFER TO THE INTERNET SITE
WCATWC.ARH.NOAA.GOV FOR MORE INFORMATION.

CAZ002-001-281219-
/O.CON.PAAQ.TS.Y.0024.000000T0000Z-000000T0000Z/
COASTAL AREAS BETWEEN AND INCLUDING GUALALA POINT
CALIFORNIA/LOCATED 80 MILES NW OF SAN FRANCISCO/ TO THE
OREGON-CALIFORNIA BORDER
349 AM PDT SUN OCT 28 2012

...THE TSUNAMI ADVISORY CONTINUES IN EFFECT FOR THE COASTAL
AREAS OF CALIFORNIA FROM GUALALA POINT CALIFORNIA/LOCATED
80 MILES NW OF SAN FRANCISCO/ TO THE OREGON-CALIFORNIA
BORDER...

PEOPLE IN TSUNAMI ADVISORY COASTAL AREAS SHOULD MOVE OUT OF
THE WATER... OFF THE BEACH AND OUT OF HARBORS AND MARINAS.

TSUNAMI ADVISORIES MEAN THAT A TSUNAMI CAPABLE OF PRODUCING
STRONG CURRENTS OR WAVES DANGEROUS TO PEOPLE IN OR VERY NEAR
WATER IS IMMINENT... EXPECTED OR OCCURRING. SIGNIFICANT WIDESPREAD
INUNDATION IS NOT EXPECTED FOR AREAS IN AN ADVISORY. TSUNAMIS ARE
A SERIES OF WAVES POTENTIALLY DANGEROUS SEVERAL HOURS AFTER INITIAL
ARRIVAL TIME.


$$

--
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

MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT.

$$


http://www.tsunami.gov

By: Mikko Wilson - mikko@kath.tv