Categorized | Earthquake, News, Tsunami

Very strong 7.0M quake in Japan, no tsunami threat to Hawaii

Magnitude
7.0

Time
2016-04-15 16:25:06 (UTC)
2016-04-15 06:25:06 HST

Nearby Places
1.0 km (0.6 mi) WSW of Kumamoto-shi, Japan
12.0 km (7.5 mi) NNE of Uto, Japan
13.0 km (8.1 mi) SSE of Ueki, Japan
15.0 km (9.3 mi) NNE of Matsubase, Japan
631.0 km (392.1 mi) SSE of Seoul, South Korea

TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1633 UTC FRI APR 15 2016

...PTWC TSUNAMI INFORMATION STATEMENT...

PRELIMINARY EARTHQUAKE PARAMETERS - FROM JMA
--------------------------------------------

  * MAGNITUDE      7.1
  * ORIGIN TIME    1625 UTC APR 15 2016
  * COORDINATES    32.8 NORTH  130.8 EAST
  * DEPTH          10 KM / 6 MILES
  * LOCATION       KYUSHU  JAPAN


EVALUATION
----------

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.1 OCCURRED IN
    KYUSHU, JAPAN AT 1625 UTC ON FRIDAY APRIL 15 2016.

  * JAPAN HAS ISSUED A TSUNAMI ADVISORY FOR THEIR NEARBY COASTS.

  * BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT
    FROM THIS EARTHQUAKE FOR ANY OTHER COASTS.


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

  * NO ACTION IS REQUIRED.


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

  * THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
    ADDITIONAL DATA ARE 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

20160415-quake-japan-advisory-area2

Tsunami Warnings / Tsunami Advisories

Issued at 02:14 JST, 16 Apr. 2016

Tsunami Advisories lifted

*******************Text********************
Tsunami Advisories have been lifted for the following coastal regions of Japan:
ARIAKE SEA AND YATSUSHIRO SEA

No Major Tsunami Warnings, Tsunami Warnings or Advisories are currently in effect.

******* Earthquake Information ********
Occurred at: 01:25 JST, 16 Apr. 2016
Region name: KUMAMOTO-KEN KUMAMOTO-CHIHO
Latitude: 32.8N
Longitude: 130.8E
Depth: about 10 km
Magnitude: 7.1


 

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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