Categorized | Earthquake, Featured, News

Very strong 7.4M quake in Papua New Guinea, no tsunami threat to Hawaii, epicenter area on alert

Magnitude
7.4

Time
2015-05-05 01:44:07 (UTC)
2015-05-04 15:44:07 Hawaii Standard Time

Nearby Cities
133km (83mi) SSW of Kokopo, Papua New Guinea
196km (122mi) E of Kimbe, Papua New Guinea
346km (215mi) SSE of Kavieng, Papua New Guinea
408km (254mi) W of Arawa, Papua New Guinea
680km (423mi) NE of Port Moresby, Papua New Guinea

TSUNAMI MESSAGE NUMBER 4
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
0326 UTC TUE MAY 5 2015

...PTWC FINAL TSUNAMI THREAT MESSAGE...

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

  * MAGNITUDE      7.4
  * ORIGIN TIME    0144 UTC MAY 5 2015
  * COORDINATES    5.5 SOUTH  152.0 EAST
  * DEPTH          50 KM / 31 MILES
  * LOCATION       NEW BRITAIN REGION  PAPUA NEW GUINEA


EVALUATION
----------

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.4 OCCURRED IN
    THE NEW BRITAIN REGION, PAPUA NEW GUINEA AT 0144 UTC ON
    TUESDAY MAY 5 2015.

  * THE PORT MORESBY OBSERVATORY HAS REPORTED SOME TSUNAMI
    OSCILLATIONS IN RABAUL HARBOR.

  * BASED ON ALL DATA AVAILABLE TO THIS CENTER... THE TSUNAMI
    THREAT FROM THIS EARTHQUAKE HAS NOW MOSTLY PASSED. ANY
    REMAINING THREAT SHOULD BE EVALUATED BY LOCAL AUTHORITIES IN
    IMPACTED AREAS.


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

  * THE TSUNAMI THREAT HAS NOW LARGELY PASSED.


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

  * GOVERNMENT AGENCIES RESPONSIBLE FOR ANY IMPACTED COASTAL
    AREAS SHOULD MONITOR CONDITIONS AT THE COAST TO DETERMINE IF
    AND WHEN IT IS SAFE TO RESUME NORMAL ACTIVITIES.

  * PERSONS LOCATED NEAR IMPACTED COASTAL AREAS SHOULD STAY ALERT
    FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM LOCAL
    AUTHORITIES.

  * REMAIN OBSERVANT AND EXERCISE NORMAL CAUTION NEAR THE SEA.


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

  * MINOR SEA LEVEL FLUCTUATIONS OF UP TO 0.3 METERS ABOVE AND
    BELOW THE NORMAL TIDE MAY CONTINUE OVER THE NEXT FEW HOURS.


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.

20150504-quake-png-map-animation

20150504-quake-png-travel-times

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.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.

 

 

Become a fan on facebook

 

 

Quantcast
%d bloggers like this: