Sunday, November 13, 2016

M7.4 Quake Strikes New Zealand

Credit USGS
















#11,900


New Zealand, which sustained heavy damage from a M7.1 quake in 2010 followed by an even more destructive M6.3 quake in early 2011, has been struck again by a major M7.4 temblor a short time ago (11:02 UTC), followed by a strong M6.2.

The first, and biggest quake, struck about 90km from Christchurch.

 Credit USGS
Credit USGS

Both quakes are reportedly shallow (10.km), and damage is likely to be substantial.   Additionally, additional quakes are likely in the coming hours, days, and even weeks.

While a Pacific wide tsunami is not expected, the Pacific Tsunami Warning Center has issued the following warning for a possible local event.

TSUNAMI INFORMATION STATEMENT NUMBER 2

NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1143 UTC SUN NOV 13 2016

...PTWC TSUNAMI INFORMATION STATEMENT...


**** NOTICE **** NOTICE **** NOTICE **** NOTICE **** NOTICE *****

 THIS STATEMENT IS ISSUED FOR INFORMATION ONLY IN SUPPORT OF THE  UNESCO/IOC PACIFIC TSUNAMI WARNING AND MITIGATION SYSTEM AND IS MEANT FOR NATIONAL AUTHORITIES IN EACH COUNTRY OF THAT SYSTEM.

 NATIONAL AUTHORITIES WILL DETERMINE THE APPROPRIATE LEVEL OF ALERT FOR EACH COUNTRY AND MAY ISSUE ADDITIONAL OR MORE REFINED INFORMATION.

**** NOTICE **** NOTICE **** NOTICE **** NOTICE **** NOTICE *****

NOTE INCREASE OF EARTHQUAKE MAGNITUDE


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.

  * A DRAWDOWN OF 2.5 METERS WAS OBSERVED AT KAIKOURA TIDE STATION.


RECOMMENDED ACTIONS
-------------------
A DAMAGING LOCAL TSUNAMI MIGHT HAVE OCCURRED. APPROPRIATE ACTIONS
SHOULD BE TAKEN TO PROTECT LIVES AND PROPERTY.


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)
    -------------------------------------------------------------
    KAIKOURA NZ          42.4S 173.7E    1103   2.49M/ 8.2FT  96


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