Categorized | Earthquake, News, Tsunami

Very strong 7.3M quake off the coast of El Salvador, tsunami warning cancelled for Central America, no threat to Hawaii

Magnitude
7.3
Date-Time
Monday, August 27, 2012 at 04:37:20 UTC
Sunday, August 26, 2012 at 10:37:20 PM at epicenter
Sunday, August 26, 2012 at 06:37:20 PM (HST) – Hawaii Standard (Honolulu)
Location
12.278°N, 88.528°W
Depth
20.3 km (12.6 miles)
Region
OFFSHORE EL SALVADOR
Distances
111 km (68 miles) S of Puerto El Triunfo, El Salvador
118 km (73 miles) S of Usulutan, El Salvador
123 km (76 miles) S of San Rafael Oriente, El Salvador
133 km (82 miles) S of Santiago de Maria, El Salvador

Current date and time in UTC/GMT/Z

TSUNAMI BULLETIN NUMBER 006
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 0702Z 27 AUG 2012

THIS BULLETIN APPLIES TO AREAS WITHIN AND BORDERING THE PACIFIC
OCEAN AND ADJACENT SEAS...EXCEPT ALASKA...BRITISH COLUMBIA...
WASHINGTON...OREGON AND CALIFORNIA.

ADDITIONAL TSUNAMI MEASUREMENTS ARE REPORTED.

... TSUNAMI WARNING CANCELLATION SUPPLEMENT ...

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME -  0437Z 27 AUG 2012
COORDINATES -  12.7 NORTH   88.5 WEST
DEPTH       -   54 KM
LOCATION    -  OFF COAST OF CENTRAL AMERICA
MAGNITUDE   -  7.3

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
-------------------  ----- ------  -----  ---------------  -----
LA UNION SV          13.3N  87.8W  0627Z   0.02M /  0.1FT  08MIN
DART 43413           10.8N 100.1W  0619Z   0.01M /  0.0FT  10MIN
ACAJUTLA SV          13.6N  89.8W  0540Z   0.10M /  0.3FT  08MIN

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.

THIS WILL BE THE FINAL BULLETIN ISSUED FOR THIS EVENT UNLESS
ADDITIONAL INFORMATION BECOMES AVAILABLE.

THE WEST COAST/ALASKA TSUNAMI WARNING CENTER WILL ISSUE PRODUCTS
FOR ALASKA...BRITISH COLUMBIA...WASHINGTON...OREGON...CALIFORNIA.

USGS: How large does an earthquake have to be to cause a tsunami?

Magnitudes below 6.5
Earthquakes of this magnitude are very unlikely to trigger a tsunami.

Magnitudes between 6.5 and 7.5
Earthquakes of this size do not usually produce destructive tsunamis. However, small sea level changes may be observed in the vicinity of the epicenter. Tsunamis capable of producing damage or casualties are rare in this magnitude range but have occurred due to secondary effects such as landslides or submarine slumps.

Magnitudes between 7.6 and 7.8
Earthquakes of this size may produce destructive tsunamis especially near the epicenter; at greater distances small sea level changes may be observed. Tsunamis capable of producing damage at great distances are rare in the magnitude range.

Magnitude 7.9 and greater
Destructive local tsunamis are possible near the epicenter, and significant sea level changes and damage may occur in a broader region.

Note that with a magnitude 9.0 earthquake, the probability of an aftershock with a magnitude exceeding 7.5 is not negligible. To date, the largest aftershock recorded has been magnitude 7.1 that did not produce a damaging tsunami.

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