Categorized | Earthquake, News

No tsunami threat from very strong 7.2M quake in the Kuril Islands

Magnitude
7.2
Date-Time
Friday, April 19, 2013 at 03:05:53 UTC
Friday, April 19, 2013 at 03:05:53 PM at epicenter
Thursday, April 18, 2013 at 05:05:53 PM (HST) – Hawaii Standard (Honolulu)
Location
46.182°N, 150.796°E
Depth
122.3 km (76.0 miles)
Region
KURIL ISLANDS
Distances
250 km (155 miles) ENE of Kuril’sk, Russia
521 km (323 miles) NE of Nemuro, Japan
527 km (327 miles) NE of Shibetsu, Japan
566 km (351 miles) ENE of Abashiri, Japan

TSUNAMI INFORMATION STATEMENT NUMBER   1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
518 PM HST THU APR 18 2013

TO - CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT - TSUNAMI INFORMATION STATEMENT

THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

   ORIGIN TIME - 0505 PM HST 18 APR 2013
   COORDINATES - 46.2 NORTH  150.9 EAST
   LOCATION    - KURIL ISLANDS
   MAGNITUDE   - 7.0  MOMENT

EVALUATION

 BASED ON ALL AVAILABLE DATA A DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS
 NOT EXPECTED AND THERE IS NO TSUNAMI THREAT TO HAWAII. REPEAT. A
 DESTRUCTIVE PACIFIC-WIDE TSUNAMI IS NOT EXPECTED AND THERE IS NO
 TSUNAMI THREAT TO HAWAII.

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

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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Oct 30, 2014 / 10:23 am

 

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