Categorized | Earthquake, News

Very strong earthquake in New Zealand, no tsunami threat to Hawaii

TSUNAMI INFORMATION STATEMENT NUMBER 3
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1259 UTC SUN NOV 13 2016

..PTWC TSUNAMI INFORMATION STATEMENT...

NOTE THE INCREASE OF EARTHQUAKE MAGNITUDE FROM MESSAGE NUMBER 1.

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

 * MAGNITUDE      7.9
 * ORIGIN TIME    1103 UTC NOV 13 2016
 * COORDINATES    42.8 SOUTH  173.4 EAST
 * DEPTH          10 KM / 6 MILES
 * LOCATION       SOUTH ISLAND OF NEW ZEALAND


EVALUATION
----------

 * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.9 OCCURRED IN
   SOUTH ISLAND, NEW ZEALAND AT 1103 UTC ON SUNDAY NOVEMBER 13
   2016.

 * LO

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

 * NEW ZEALAND CIVIL DEFENSE HAS ISSUED A TSUNAMI THREAT
   MESSAGE FOR THE EAST COAST OF SOUTH ISLAND.

 * TSUNAMI THREAT BEYOND NEW ZEALAND IS NOT EXPECTED.

TSUNAMI OBSERVATIONS
--------------------

 * THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
   AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
   LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
   RESPECT TO THE NORMAL TIDE LEVEL.

                           GAUGE      TIME OF   MAXIMUM     WAVE
                        COORDINATES   MEASURE   TSUNAMI   PERIOD
   GAUGE LOCATION        LAT   LON     (UTC)     HEIGHT    (MIN)
   -------------------------------------------------------------
   CASTLEPOINT NZ       40.9S 176.2E    1210   0.12M/ 0.4FT  18
   WELLINGTON NZ        41.3S 174.8E    1232   0.43M/ 1.4FT  16
   KAIKOURA NZ          42.4S 173.7E    1140   1.47M/ 4.8FT  16


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.

Tsunami Warning issued for New Zealand.

Sea level fluctuations recorded at Kaikoura, New Zealand.

Sea level fluctuations recorded at Kaikoura, New Zealand.


Animation of the tsunami wave from the 7.9 magnitude South Island earthquake in New Zealand on Sunday, November 13, 2016 (Hawaii Time).

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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