Magnitude 7.7 - KEPULAUAN MENTAWAI REGION, INDONESIA

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2010 October 25 14:42:22 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude7.7
Date-Time
Location 3.484°S, 100.114°E
Depth20.6 km (12.8 miles)
RegionKEPULAUAN MENTAWAI REGION, INDONESIA
Distances240 km (150 miles) W of Bengkulu, Sumatra, Indonesia
280 km (175 miles) S of Padang, Sumatra, Indonesia
305 km (190 miles) W of Lubuklinggau, Sumatra, Indonesia
795 km (500 miles) WNW of JAKARTA, Java, Indonesia
Location Uncertaintyhorizontal +/- 5.3 km (3.3 miles); depth +/- 3.4 km (2.1 miles)
ParametersNST=297, Nph=297, Dmin=330.2 km, Rmss=1.16 sec, Gp= 22°,
M-type=surface wave magnitude (Ms), Version=V
Source
  • USGS NEIC (WDCS-D)
Event IDusa00043nx
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Earthquake Summary

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Earthquake Summary Poster

Felt Reports

At least 340 people killed and 330 missing from the earthquake and tsunami with maximum heightof 7meters. Felt (III) at Bukittinggi and Padang, Sumatra. Also felt at Bengkulu. Felt (II) inSingapore. Felt at Bangkok, Thailand.

Tectonic Summary

The Pulau Pagai Selatan, Sumatra earthquake of October 25, 2010 occurred as a result of thrust faulting on or near the subduction interface plate boundary between the Australia and Sunda plates. At the location of this earthquake, the Australia Plate move north-northeast with respect to the Sunda plate at a velocity of approximately 57-69 mm/yr. On the basis of the currently available fault mechanism information and earthquake depth it is likely that this earthquake occurred along the plate interface. The subduction zone adjacent to the region of this event last slipped during the Mw 8.5 and 7.9 earthquakes of September 2007, and today's event appears to have occurred near the rupture zones of those earthquakes. Today's earthquake is the latest in a sequence of large ruptures along the Sunda megathrust, including a M 9.1 earthquake that ruptured to within 800 km north of this earthquake in 2004; a M 8.6 700 km to the north between Nias and Simeulue in 2005; and a M 7.5 300 km to the north near Padang in 2009. Today's earthquake occurred near the southern edge of a Mw 8.7-8.9 rupture in 1797 and within the rupture area of a Mw 8.9-9.1 earthquake in 1833.

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Tsunami Information

The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.

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