Categorized | Earthquake, News

Very 7.1M strong quake in East Pacific, no tsunami threat


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Magnitude
7.1

Event Time
2014-10-09 02:14:32 UTC
2014-10-08 19:14:32 UTC-07:00 at epicenter
2014-10-08 16:14:32 UTC-10:00 Hawaii Standard Time

Location
32.115°S 110.779°W depth=15.5km (9.6mi)

Nearby Cities
565km (351mi) SSW of Hanga Roa, Chile
3426km (2129mi) W of Lebu, Chile
3433km (2133mi) W of Ancud, Chile
3443km (2139mi) W of Chonchi, Chile
2041km (1268mi) ESE of Adamstown, Pitcairn

TSUNAMI INFORMATION STATEMENT NUMBER 4
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
0254 UTC THU OCT 9 2014

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

  * MAGNITUDE      7.2
  * ORIGIN TIME    0215 UTC OCT 9 2014
  * COORDINATES    32.1 SOUTH  111.0 WEST
  * DEPTH          10 KM / 6 MILES
  * LOCATION       SOUTHERN EAST PACIFIC RISE


EVALUATION
----------

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.2 OCCURRED
    NEAR THE SOUTHERN EAST PACIFIC RISE AT 0215 UTC ON THURSDAY
    OCTOBER 9 2014.

  * THERE IS NO TSUNAMI THREAT FROM THIS EARTHQUAKE.


RECOMMENDED ACTIONS
-------------------

  * PERSONS ALONG COASTAL AREAS NEAR THE EARTHQUAKE SHOULD BE
    OBSERVANT AND EXERCISE NORMAL CAUTION. OTHERWISE... NO ACTION
    IS REQUIRED.


POTENTIAL IMPACTS
-----------------

NEXT UPDATE AND ADDITIONAL INFORMATION
--------------------------------------

  * THIS WILL BE THE FINAL STATEMENT ISSUED FOR THIS EVENT UNLESS
    NEW INFORMATION IS RECEIVED OR THE SITUATION CHANGES.

  * AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
    GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
    EARTHQUAKE.USGS.GOV/EARTHQUAKES -ALL LOWER CASE-.

  * FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
    PTWC.WEATHER.GOV AND AT WWW.TSUNAMI.GOV.

  * COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
    CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
    SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
    PTWC.WEATHER.GOV.

  * COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
    BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S. NATIONAL
    TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND AT
    NTWC.ARH.NOAA.GOV.

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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