Magnitude 7.2 - NORTHERN SUMATRA, INDONESIA

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2010 May 09 05:59:42 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude7.2
Date-Time
Location 3.747°N, 96.013°E
Depth45 km (28.0 miles) set by location program
RegionNORTHERN SUMATRA, INDONESIA
Distances200 km (125 miles) SW of Lhokseumawe, Sumatra, Indonesia
215 km (135 miles) SSE of Banda Aceh, Sumatra, Indonesia
630 km (395 miles) W of KUALA LUMPUR, Malaysia
1620 km (1010 miles) NW of JAKARTA, Java, Indonesia
Location Uncertaintyhorizontal +/- 3.6 km (2.2 miles); depth fixed by location program
ParametersNST=532, Nph=532, Dmin=193.9 km, Rmss=0.91 sec, Gp= 25°,
M-type=teleseismic moment magnitude (Mw), Version=A
Source
  • USGS NEIC (WDCS-D)
Event IDus2010wbaq
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Earthquake Summary

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Earthquake Summary Poster

Felt Reports

Reports of slight damage and a power outage on Simeulue island. Felt (V) at Banda Aceh and Meulaboh; (IV) at Medan, Nias and Padang and (III) at Riau and Sibolga. Felt (III) at Alor Setar, Ayer Itam and Tanjong Bunga; (II) at Bukit Mertajam, Butterworth, Gelugor, Georgetown, Kuala Lumpur, Nibong Tebal and Tanjong Tokong, Malaysia. Felt (II) in Singapore. Felt (III) at Phuket, Thailand.

Tectonic Summary

The northern Sumatra earthquake of May 9, 2010 occurred as a result of thrust faulting on or near the subduction interface plate boundary between the Australia-India and Sunda plates. At the location of this earthquake, the Australia and India Plates move north-northeast with respect to the Sunda plate at a velocity of approximately 60-65 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 surrounding the immediate region of this event slipped during the devastating Mw 9.1 earthquake of December 2004, and today's event appears to have occurred within the rupture zone of that earthquake. Today's earthquake is the latest in a sequence of large ruptures along the Sunda megathrust, including a M 7.8 in April of this year, approximately 200 km to the south of today's event; two M 7.4 earthquakes beneath Simeulue approximately 100 km to the south in 2002 and 2008; a M 8.6 210 km to the south in 2005; a M 7.5 650 km to the south near Padang in 2009; and two events of M8.5 and M7.9 approximately 1000 km to the south in 2007.

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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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