Categorized | Earthquake, News

Light 4.3M quake off the Ka‘u coast Saturday (Nov 24)

*Note: Seismologists have updated the intensity of the quake to 4.3 magnitude*

Magnitude
4.3
Date-Time
Sunday, November 25, 2012 at 03:59:46 UTC
Saturday, November 24, 2012 at 05:59:46 PM at epicenter
Location
18.952°N, 155.192°W
Depth
16.9 km (10.5 miles)
Region
HAWAII REGION, HAWAII
Distances
41 km (26 miles) SE (133°) from Pahala, HI
43 km (27 miles) ESE (107°) from Naalehu, HI
56 km (34 miles) S (175°) from Volcano, HI
73 km (45 miles) SSW (204°) from Hawaiian Beaches, HI
85 km (52 miles) S (188°) from Hilo, HI
380 km (236 miles) SE (133°) from Honolulu, HI

TSUNAMI SEISMIC INFORMATION STATEMENT NUMBER   1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
603 PM HST SAT NOV 24 2012

TO - CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT - LOCAL TSUNAMI INFORMATION STATEMENT

THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

   ORIGIN TIME - 0600 PM HST 24 NOV 2012
   COORDINATES - 18.9 NORTH  155.2 WEST
   LOCATION    - AT LOIHI SEAMOUNT SOUTH OF THE BIG ISLAND
   MAGNITUDE   - 4.1

EVALUATION

 NO TSUNAMI IS EXPECTED. REPEAT. NO TSUNAMI IS EXPECTED.
 HOWEVER...SOME AREAS MAY HAVE EXPERIENCED SHAKING.

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

If you felt this earthquake you can report it to the U.S. Geological Survey here:

earthquake.usgs.gov/earthquake…

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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Jul 25, 2014 / 5:15 pm

 

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