M8.2 Aftershock Follows Mega Quake Off Sumatra

Large aftershock strikes Off the Coast of Sumatra

More than a dozen significant aftershocks have occurred off the coast of Sumatra, the largest of which measured 8.2Mw, according to USGS/EHP.

Earthquake Location Map. Source: USGS. Map enhanced by FIRE-EARTH

EQ Details

• Magnitude 8.2
• Date-Time:  Wednesday, April 11, 2012 at 10:43:09 UTC
• Location: 0.773°N, 92.452°E
• Depth: 16.4 km (10.2 miles)
• Distances:
  • 618 km (384 miles) SSW of Banda Aceh, Sumatra, Indonesia
  • 712 km (442 miles) W of Sibolga, Sumatra, Indonesia
  • 1,062 km (659 miles) WSW of KUALA LUMPUR, Malaysia
  • 1,773 km (1,101 miles) WNW of JAKARTA, Java, Indonesia
• Location Uncertainty horizontal +/- 14.2 km (8.8 miles); depth +/- 6.4 km (4.0 miles)
• Source:  USGS NEIC (WDCS-D)

Tsunami Alert

TSUNAMI BULLETIN NUMBER 005
PACIFIC TSUNAMI WARNING CENTER/NOAA/NWS
ISSUED AT 1151Z 11 APR 2012

THIS BULLETIN IS FOR ALL AREAS OF THE INDIAN OCEAN.

... AN INDIAN-OCEAN-WIDE TSUNAMI WATCH IS IN EFFECT ...

... A MAJOR AFTERSHOCK OCCURRED AT 1043Z WITH MAGNITUDE 8.3 ...

... THE WATCH AREA IS NOW REDUCED ...

A TSUNAMI WATCH IS IN EFFECT FOR

 INDONESIA / INDIA / SRI LANKA / MALDIVES / UNITED KINGDOM

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 -  0839Z 11 APR 2012
 COORDINATES -   2.3 NORTH   93.1 EAST
 LOCATION    -  OFF W COAST OF NORTHERN SUMATRA
 MAGNITUDE   -  8.7

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER
 -------------------  ----- ------  -----  ---------------  -----
 TRINCONMALEE LK       8.6N  81.2E  1116Z   0.04M /  0.1FT  18MIN
 COCOS ISLAND AU      12.1S  96.9E  1102Z   0.08M /  0.3FT  18MIN
 TELUKDALAM ID         0.6N  97.8E  1045Z   0.19M /  0.6FT  10MIN
 SABANG ID             5.8N  95.3E  1010Z   0.36M /  1.2FT  06MIN
 MEULABOH ID           4.1N  96.1E  1007Z   1.06M /  3.5FT  12MIN
 DART 23401            8.9N  88.5E  0956Z   0.03M /  0.1FT  06MIN

 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.

 NOTE - DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY
        ARE GENERALLY MUCH SMALLER THAN WOULD BE COASTAL
         MEASUREMENTS AT SIMILAR LOCATIONS.

EVALUATION

 SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. IT MAY
 ALREADY HAVE BEEN DESTRUCTIVE ALONG SOME COASTS.

 BASED ON THESE DATA THE THREAT CONTINUES FOR ALL COASTAL AREAS OF
 THE INDIAN OCEAN. FOR THOSE AREAS - WHEN NO MAJOR WAVES HAVE
 OCCURRED FOR AT LEAST TWO HOURS AFTER THE ESTIMATED ARRIVAL TIME
 OR 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.

ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS
WITHIN THE WARNING AND WATCH AREAS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
SUCCESSIVE WAVES CAN BE FIVE MINUTES TO ONE HOUR.

 LOCATION         FORECAST POINT     COORDINATES     ARRIVAL TIME
 --------------------------------    ------------    ------------
 INDONESIA        SIMEULUE            2.5N  96.0E    0912Z 11 APR
                  BANDA_ACEH          5.5N  95.1E    0933Z 11 APR
                  SIBERUT             1.5S  98.7E    0944Z 11 APR
                  PADANG              0.9S 100.1E    1025Z 11 APR
                  BENGKULU            3.9S 102.0E    1037Z 11 APR
                  CILACAP             7.8S 108.9E    1150Z 11 APR
                  BANDAR_LAMPUNG      5.7S 105.3E    1200Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
                  BELAWAN             3.8N  98.8E    1326Z 11 APR
                  KUPANG             10.0S 123.4E    1333Z 11 APR
                  BALI                8.7S 115.3E    1234Z 11 APR
 INDIA            GREAT_NICOBAR       7.1N  93.6E    0937Z 11 APR
                  LITTLE_ANDAMAN     10.7N  92.3E    1015Z 11 APR
                  NORTH_ANDAMAN      13.3N  92.6E    1045Z 11 APR
                  PORT_BLAIR         11.9N  92.7E    1050Z 11 APR
                  CHENNAI            13.4N  80.4E    1134Z 11 APR
                  TRIVANDRUM          8.3N  76.9E    1204Z 11 APR
                  KAKINADA           17.2N  82.7E    1204Z 11 APR
                  MANGALORE          13.3N  74.4E    1339Z 11 APR
                  BOMBAY             18.8N  72.6E    1605Z 11 APR
                  GULF_OF_KUTCH      22.7N  68.9E    1636Z 11 APR
 SRI LANKA        TRINCOMALEE         8.7N  81.3E    1049Z 11 APR
                  DONDRA_HEAD         5.9N  80.6E    1054Z 11 APR
                  COLOMBO             6.9N  79.8E    1121Z 11 APR
                  JAFFNA              9.9N  80.0E    1235Z 11 APR
 MALDIVES         GAN                 0.6S  73.2E    1144Z 11 APR
                  MALE                4.2N  73.6E    1149Z 11 APR
                  MINICOV             8.3N  73.0E    1214Z 11 APR
 UNITED KINGDOM   DIEGO_GARCIA        7.3S  72.4E    1202Z 11 APR

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Strong Earthquake Strikes Southern Sumatra

M6.5 Earthquake Strikes Southwest of Sumatra, Indonesia

The strong shock was centered at 4.063°S, 101.085°E and occurred at an estimated depth of about 27km on Wednesday, May 05, 2010 at 16:29:03 UTC, USGS/EHP said.

The earthquake epicenter was located about 50km (31 miles) NNW of a large 8.5Mw quake which struck on September 12, 2007 at a depth of about 34km (21miles) killing at least 25 people.

Tsunami Status

The Pacific Tsunami Center ruled out the possibility of a destructive widespread tsunami as a result of this quake, but did not rule out “a very small possibility of a local tsunami” that may affect the local coasts within a radius of about 100km from the quake’s epicenter.

Fire-Earth Forecast:

Fire-Earth Forecasts large scale volcanic activity in and around Sumatra Region in 2010 and beyond.

10-degree Map Centered at 5°S,100°E

Earthquake Location Map. Source: USGS/EHP. Map enhanced by Fire-Earth.

Earthquake Details

• Magnitude: 6.5
• Date-Time:
  • Wednesday, May 05, 2010 at 16:29:03 UTC
  • Wednesday, May 05, 2010 at 11:29:03 PM at epicenter
• Location: 4.063°S, 101.085°E
• Depth: 27 km (16.8 miles)
• Region: SOUTHERN SUMATRA, INDONESIA
• Distances:
  • 135 km (85 miles) WSW of Bengkulu, Sumatra, Indonesia
  • 215 km (135 miles) WSW of Lubuklinggau, Sumatra, Indonesia
  • 355 km (220 miles) SSE of Padang, Sumatra, Indonesia
  • 680 km (420 miles) WNW of JAKARTA, Java, Indonesia
• Location Uncertainty:  horizontal +/- 5.3 km (3.3 miles)
• Source:  USGS NEIC (WDCS-D)
• Event ID: us2010vxbk

Related Links:

• FEWW Volcano Links
• Volcanoes
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Large Quake Could Strike Near Padang, Sumatra

Strong Earthquake Measuring 6.2 Mw Strikes Kepulauan Mentawai Region, Indonesia

An earthquake measuring 6.2 Mw struck Kepulauan Mentawai Region, about 115 km (70 miles) WSW of Padang, Sumatra, Indonesia, at a depth of about 22km. The mainshock was followed by at least one aftershock measuring 5.3Mw.

More than two dozen quakes measuring 5.0Mw or larger, including a 6.9Mw quake that occurred in August 2009, have struck the area since mid August 2009.

Based on the existing information, FEWW EarthModel forecasts a large quake measuring ≥8.0 could strike near Padang, the capital and largest city of West Sumatra, Indonesia.

Padang has a population of about 800,000 people.

Earthquake Details:

Region: Southern Sumatra, Indonesia
Time: 2009-12-23 01:11:59.6 UTC
Magnitude: 6.2 [estimated by FEWW]
Epicenter: 99.47°E 1.43°S   [location estimated by USGS: 1.419°S, 99.448°E]
Depth: 27 km

EQ Location Map. Source: GFZ Potsdam – Earthquake Bulletin. Image may be subject to copyright.

Seismic Hazard Map

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS/EHP

Historic Seismicity

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Source: USGS/EHP

Related Links:

• FEWW Volcano Links
• Volcanoes
• FEWW Earthquake Links

Earthquakes: Human Enhanced Disasters – UPDATE 2 Oct 2009

Sumatra Double Earthquakes

FEWW Moderators believe it’s highly probable that another 2 or more strong to powerful quakes could strike the region in the coming days. Padang and other coastal towns in Sumatra and Java must also prepare for a possible tsunami.

At least 1,200 bodies have been recovered following widespread damage after a magnitude 7.9 quake  struck southern Sumatra, Indonesia, on Wednesday, according to the officials.

The Death Toll Could Reach Many Thousands

There are no reports of deaths from the 6.8 magnitude quake that struck southern Sumatra  on Thursday. However. a local radio station reported that a dozen 12 people had been injured and up to 75 building damaged in  the town of Jambi.

“People are trapped and screaming for help but they are below huge slabs which will take heavy equipment to move,” an aid worker said.

“I saw dozens of the biggest buildings collapsed in town. Most of the damage is concentrated in the commercial center market, which was fully packed,” he said.

Images that will be repeated throughout the world, again, and again

Residents stand near the bodies of earthquake victims at a hospital in Padang on Indonesia’s Sumatra
island October 1, 2009.  REUTERS/Muhammad Fitrah/Singgalang Newspaper

Regional Economy

West Sumatra, a major producer of crude palm oil, is also affected economically.

Indonesia’s finance minister Sri Mulyani said: “This region has been damaged seriously, including its infrastructure,” adding that her government has allocated $25 million over two month for emergency operations.

Related Links:

• Another Strong Quake Hits Sumatra
• Disaster Update: Indonesia Quake

• Powerful Earthquake Strikes Southern Sumatra, Indonesia
• Deadly Earthquake Strikes Java, Indonesia
• Magnitude 8.3 Quake Strikes Samoa Islands Region
• The Largest Earthquake
• Earthquakes [Main Index Page]

• Reuters Photo Gallery