Wednesday, September 16, 2015

Chile M8.3 Quake : Pacific Tsunami Watch Issued (Updated)

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USGS Screen shot 19:15 hrs 9/16/15

 

UPDATED WITH Tsunami Alert #3 (at bottom)

 

#10,530

 

The USGS is reporting a very large, and relatively shallow earthquake off the coast of Chile. Originally reported as a M7.9, the USGS has just upgraded it to M8.3.   There may be further adjustments (up or down) to the intensity of this quake as more readings are analyzed.

 

While we wait for clarification and word of any damage in Chile, the Pacific Tsunami Warning Center has issued a Tsunami Watch for the Hawaiian Islands.

 

BULLETIN

TSUNAMI MESSAGE NUMBER   1


NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
108 PM HST WED SEP 16 2015

TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII

SUBJECT - TSUNAMI WATCH

A TSUNAMI WATCH IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT
0108 PM HST.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

   ORIGIN TIME - 1255 PM HST 16 SEP 2015
   COORDINATES - 20.0 SOUTH   71.3 WEST
   LOCATION    - OFF THE COAST OF NORTHERN CHILE
   MAGNITUDE   - 7.9  MOMENT

NOTE THAT THIS MESSAGE REFLECTS A CORRECTION TO THE ORIGIN TIME OF THE EARTHQUAK

EVALUATION

BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII.

IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS

                     0228 AM HST THU 17 SEP 2015

FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.

 

UPDATED:   Latest Tsunami Message, with forecasted wave heights across the Pacific.  

The largest tsunami waves (> 3 meters) can be expected along the Chilean coast.   Smaller amplitude waves are possible elsewhere across the Pacific basin over the next 12 to 18 hours.   Follow the link for expected arrival times.

 

TSUNAMI MESSAGE NUMBER 3
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
2346 UTC WED SEP 16 2015

PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------


  * MAGNITUDE      8.3
  * ORIGIN TIME    2254 UTC SEP 16 2015
  * COORDINATES    31.5 SOUTH  72.0 WEST
  * DEPTH          10 KM / 6 MILES
  * LOCATION       NEAR THE COAST OF CENTRAL CHILE

EVALUATION
----------

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 8.3 OCCURRED NEAR THE COAST OF     CENTRAL CHILE AT 2254 UTC ON WEDNESDAY   SEPTEMBER 16 2015.

  * BASED ON ALL AVAILABLE DATA... HAZARDOUS TSUNAMI WAVES ARE  FORECAST FOR SOME  COASTS.

TSUNAMI THREAT FORECAST...UPDATED
---------------------------------

  * TSUNAMI WAVES REACHING MORE THAN 3 METERS ABOVE THE TIDE     LEVEL ARE POSSIBLE ALONG SOME COASTS OF    CHILE.

  * TSUNAMI WAVES REACHING 1 TO 3 METERS ABOVE THE TIDE LEVEL ARE    POSSIBLE ALONG SOME COASTS OF    FRENCH POLYNESIA.

  * TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL    ARE POSSIBLE FOR SOME COASTS OF

      MEXICO... ECUADOR... PERU... ANTARCTICA... JAPAN... NEW  CALEDONIA... NEW ZEALAND... MARSHALL ISLANDS... FIJI... SAMOA...  AMERICAN SAMOA... COOK ISLANDS... TOKELAU... VANUATU...   KIRIBATI... JOHNSTON ISLAND... PALMYRA ISLAND... HOWLAND AND       BAKER... TONGA... WALLIS AND FUTUNA... PITCAIRN ISLANDS...   NIUE... SOLOMON ISLANDS... RUSSIA... HAWAII... AND NW HAWAIIAN    ISLANDS.

  * TSUNAMI WAVES ARE FORECAST TO BE LESS THAN 0.3 METERS ABOVE   THE TIDE LEVEL FOR THE COASTS OF    EL SALVADOR... GUATEMALA... HONDURAS... COSTA RICA...  NICARAGUA...  PANAMA... COLOMBIA... AUSTRALIA... PHILIPPINES...  TAIWAN... CHINA... NORTHERN MARIANAS... GUAM... PALAU... YAP...    POHNPEI... CHUUK... KOSRAE... NAURU... WAKE ISLAND... MIDWAY       ISLAND... JARVIS ISLAND... TUVALU... PAPUA NEW GUINEA...    INDONESIA... VIETNAM... MALAYSIA... AND BRUNEI.

  * ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST  AMPLITUDES DUE TO UNCERTAINTIES IN THE FORECAST AND LOCAL  FEATURES. IN PARTICULAR MAXIMUM TSUNAMI AMPLITUDES ON ATOLLS   WILL LIKELY BE MUCH SMALLER THAN THE FORECAST INDICATES.

  * FOR OTHER AREAS COVERED BY THIS PRODUCT A FORECAST HAS NOT   YET BEEN COMPUTED. THE FORECAST WILL BE EXPANDED AS NECESSARY IN SUBSEQUENT PRODUCTS.

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