Monday, March 28, 2005

Tsunami Hazard on Monday March 28th, 2005

An earthquake on March 28th, 2005 is being reported in the Indian Ocean off the coast of Northern Sumara. This earthquake at 8.2 on the Richter scale is considerably weaker than the
Tsunami of 9.3 on December 26th, 2004. As I write this, it is about 2 hours since the event and the news was just reported on BBC and CNN. At least some people in Sri Lanka are aware of this -

The earthquake observations of the USGS is given next followed by the Tsunami warning issued by the Pacific Tsunami Warning Centre.

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EARTHQUAKE MEASURING 8.2 ON RICHTER SCALE HAS OCCURED OFF NORTH SUMATRA IN INDIAN OCEAN at 11.09 pm local time

A great earthquake occurred at 16:09:37 (UTC) on Monday, March 28, 2005. The magnitude 8.2 event has been located in NORTHERN SUMATRA, INDONESIA. (This event has been reviewed by a seismologist.)

Magnitude 8.2
Date-Time Monday, March 28, 2005 at 16:09:37 (UTC)
= Coordinated Universal Time
Monday, March 28, 2005 at 11:09:37 PM
= local time at epicenter
Time of Earthquake in other Time Zones
Location 2.093°N, 97.016°E
Depth 30 km (18.6 miles) set by location program
Region NORTHERN SUMATRA, INDONESIA
Distances 205 km (125 miles) WNW of Sibolga, Sumatra, Indonesia
245 km (150 miles) SW of Medan, Sumatra, Indonesia
535 km (330 miles) WSW of KUALA LUMPUR, Malaysia
1410 km (880 miles) NW of JAKARTA, Java, Indonesia
Location Uncertainty horizontal ± 6.1 km (3.8 miles); depth fixed by location program
Parameters Nst= 65, Nph= 65, Dmin=535.9 km, Rmss=0.85 sec, Gp= 61°,
M-type=moment magnitude (Mw), Version=6
Source USGS NEIC (WDCS-D)
Event ID usweax
SEE USGS REPORTS AT : http://www.prh.noaa.gov/ptwc/wmsg

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A TSUNAMI WARNING HAS BEEN ISSUED BY PACIFIC TSUNAMI WARNING CENTRE

TSUNAMI BULLETIN NUMBER 001
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1629Z 28 MAR 2005

. TSUNAMI INFORMATION BULLETIN ...


AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 1610Z 28 MAR 2005
COORDINATES - 2.3 NORTH 97.1 EAST LOCATION - NORTHERN SUMATERA INDONESIA
MAGNITUDE - 8.5

EVALUATION
WARNING... THIS EARTHQUAKE HAS THE POTENTIAL TO GENERATE A WIDELY DESTRUCTIVE TSUNAMI IN THE OCEAN OR SEAS NEAR THE EARTHQUAKE. AUTHORITIES IN THOSE REGIONS SHOULD BE AWARE OF THIS POSSIBILITY AND TAKE IMMEDIATE ACTION. THIS ACTION SHOULD INCLUDE EVACUATION OF COASTS WITHIN A THOUSAND KILOMETERS OF THE EPICENTER AND CLOSE MONITORING TO DETERMINE THE NEED FOR EVACUATION FURTHER AWAY.

THIS CENTER DOES NOT HAVE SEA LEVEL GAUGES OUTSIDE THE PACIFIC SO WILL NOT BE ABLE TO DETECT OR MEASURE A TSUNAMI IF ONE WAS GENERATED. AUTHORITIES CAN ASSUME THE DANGER HAS PASSED IF NO TSUNAMI WAVES ARE OBSERVED IN THE REGION NEAR THE EPICENTER WITHIN THREE HOURS OF THE EARTHQUAKE.