7.4 and 7.0 earthquakes off the coast of Sumatra, Indonesia

[JonathanBelles]

Code: Select all

Magnitude   7.4
Date-Time   

    * Wednesday, February 20, 2008 at 08:08:32 UTC
    * Wednesday, February 20, 2008 at 03:08:32 PM at epicenter
    * Time of Earthquake in other Time Zones

Location   2.778°N, 95.978°E
Depth   35 km (21.7 miles) set by location program
Region   SIMEULUE, INDONESIA
Distances   310 km (190 miles) SSE of Banda Aceh, Sumatra, Indonesia
310 km (190 miles) WSW of Medan, Sumatra, Indonesia
335 km (210 miles) WNW of Sibolga, Sumatra, Indonesia
1545 km (960 miles) NW of JAKARTA, Java, Indonesia
Location Uncertainty   horizontal +/- 5.5 km (3.4 miles); depth fixed by location program
Parameters   NST=233, Nph=233, Dmin=588 km, Rmss=0.97 sec, Gp= 32°,
M-type=moment magnitude (Mw), Version=8
Source   

    * USGS NEIC (WDCS-D)

Event ID   us2008nran

Code: Select all

Magnitude   7.0
Date-Time   

    * Monday, February 25, 2008 at 08:36:35 UTC
    * Monday, February 25, 2008 at 03:36:35 PM at epicenter
    * Time of Earthquake in other Time Zones

Location   2.352°S, 100.018°E
Depth   35 km (21.7 miles) set by location program
Region   KEPULAUAN MENTAWAI REGION, INDONESIA
Distances   160 km (100 miles) SSW of Padang, Sumatra, Indonesia
295 km (185 miles) WNW of Bengkulu, Sumatra, Indonesia
635 km (395 miles) SSW of KUALA LUMPUR, Malaysia
855 km (530 miles) WNW of JAKARTA, Java, Indonesia
Location Uncertainty   horizontal +/- 8.5 km (5.3 miles); depth fixed by location program
Parameters   NST= 78, Nph= 78, Dmin=847 km, Rmss=1.28 sec, Gp= 50°,
M-type=moment magnitude (Mw), Version=8
Source   

    * USGS NEIC (WDCS-D)

Event ID   us2008nwbg

http://earthquake.usgs.gov/eqcenter/eqi ... g/#details

[JonathanBelles]

Looks like there is no threat of a Tsunami.

[HURAKAN]

This poor people can't have a peaceful time as earthquakes have not stopped since December 2004. Lets hope the fault goes quiet soon.

[Chacor]

477
WEIO21 PHEB 251009
TSUIOX
TSUNAMI BULLETIN NUMBER 002
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1009Z 25 FEB 2008

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

... THE LOCAL TSUNAMI WATCH IS CANCELLED ...

A TSUNAMI WATCH IS NOW CANCELLED FOR

INDONESIA

FOR OTHER AREAS OF THE INDIAN OCEAN REGION...THIS MESSAGE IS FOR
INFORMATION ONLY.

THIS BULLETIN IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES. ONLY
NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE
DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND
ANY ACTIONS TO BE TAKEN IN RESPONSE.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 0837Z 25 FEB 2008
COORDINATES - 2.5 SOUTH 99.9 EAST
LOCATION - SOUTHERN SUMATRA INDONESIA
MAGNITUDE - 7.1

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
PADANG ID 0.9S 100.4E 0933Z 0.12M / 0.4FT 22MIN

LAT - LATITUDE (N-NORTH, S-SOUTH)
LON - LONGITUDE (E-EAST, W-WEST)
TIME - TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)
AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.
IT IS ...NOT... CREST-TO-TROUGH WAVE HEIGHT.
VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).
PER - PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION

SEA LEVEL READINGS INDICATE A SMALL TSUNAMI WAS GENERATED. IT MAY
HAVE BEEN DESTRUCTIVE ALONG COASTS NEAR THE EARTHQUAKE EPICENTER.
FOR THOSE AREAS - WHEN DAMAGING WAVES HAVE NOT OCCURRED FOR AT
LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME THE THREAT IS
PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR
SEVERAL HOURS DUE TO RAPID CURRENTS. AS LOCAL CONDITIONS CAN
CAUSE A WIDE VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR
DETERMINATION MUST BE MADE BY LOCAL AUTHORITIES.
NO TSUNAMI THREAT EXISTS FOR OTHER COASTAL AREAS IN THE INDIAN
OCEAN ALTHOUGH SOME OTHER AREAS MAY EXPERIENCE SMALL SEA LEVEL
CHANGES AND STRONG OR UNUSUAL COASTAL CURRENTS.

THIS WILL BE THE FINAL BULLETIN ISSUED BY THE PACIFIC TSUNAMI
WARNING CENTER FOR THIS EVENT UNLESS ADDITIONAL INFORMATION
BECOMES AVAILABLE.

THE JAPAN METEOROLOGICAL AGENCY MAY ISSUE ADDITIONAL INFORMATION
FOR THIS EVENT. IN THE CASE OF CONFLICTING INFORMATION...THE
MORE CONSERVATIVE INFORMATION SHOULD BE USED FOR SAFETY.

[Cyclenall]

There seems to be a lot of earthquakes all of a sudden.

[lurkey]

There seems to be a lot of earthquakes all of a sudden.

A question: The area is volcanically active. Can this be indication of an eruption of any of its many volcanos, namely Tambora or Toba?

[Stephanie]

It may signal something yet to come, lurker.

Those poor people in Indonesia! They can't catch a break. That was a monster sized quake and aftershock.

[Ptarmigan]

Every 200 years, Indonesia is more seismically active. The 1800s had Tambora (1815) and Krakatoa (1883). Tambora is the biggest eruption in recent history. Much larger and more dust than Krakatoa.

[HurricaneBill]

Unfortunately, Indonesia lies along the Ring of Fire.

[flwxwatcher]

That area is also home to a super Volcano . I wonder if all this activity could hasten an eruption???

[lurkey]

That area is also home to a super Volcano . I wonder if all this activity could hasten an eruption???

Toba or officially, Lake Toba, is the supervolcano. I think the earthquakes have been in that area, but I don't have earthquake data to pinpoint if it is close to Lake Toba.

The Tambora eruption of 1815 led to the "Year without a Summer" in Europe and North America in 1816.