Categorized | Earthquake, News

No tsunami threat from strong quake in Fiji Islands area Monday (July 21)


View M6.9 – 100km NNE of Ndoi Island, Fiji – 2014-07-21 14:54:40 UTC in a larger map

Magnitude
6.9

Event Time
2014-07-21 14:54:40 UTC
2014-07-21 02:54:40 UTC-12:00 at epicenter
2014-07-21 04:54:40 Hawaii Standard Time

Location
19.780°S 178.441°W depth=616.1km (382.8mi)

Nearby Cities
100km (62mi) NNE of Ndoi Island, Fiji
369km (229mi) WNW of Nuku`alofa, Tonga
375km (233mi) ESE of Suva, Fiji
437km (272mi) SSE of Lambasa, Fiji
488km (303mi) ESE of Nadi, Fiji

TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1500Z 21 JUL 2014

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

... TSUNAMI INFORMATION BULLETIN ...

THIS BULLETIN IS FOR INFORMATION ONLY.

THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES.  ONLY
NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE
DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND
ANY ACTIONS TO BE TAKEN IN RESPONSE.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

 ORIGIN TIME -  1455Z 21 JUL 2014
 COORDINATES -  19.7 SOUTH  178.3 WEST
 DEPTH       -  613 KM
 LOCATION    -  FIJI REGION
 MAGNITUDE   -  6.8

EVALUATION

 A DESTRUCTIVE TSUNAMI WAS NOT GENERATED BECAUSE THIS EARTHQUAKE
 IS LOCATED TOO DEEP INSIDE THE EARTH.

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

THE U.S. NATIONAL 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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