Magnitude 7.2 - OFF THE WEST COAST OF NORTHERN SUMATRA

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2012 January 10 18:36:59 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Magnitude7.2
Date-Time
Location 2.452°N, 93.209°E
Depth20.5 km (12.7 miles)
RegionOFF THE WEST COAST OF NORTHERN SUMATRA
Distances423 km (262 miles) SW of Banda Aceh, Sumatra, Indonesia
537 km (333 miles) SW of Lhokseumawe, Sumatra, Indonesia
951 km (590 miles) W of KUALA LUMPUR, Malaysia
1789 km (1111 miles) WNW of JAKARTA, Java, Indonesia
Location Uncertaintyhorizontal +/- 13.1 km (8.1 miles); depth +/- 4.8 km (3.0 miles)
ParametersNST=440, Nph=453, Dmin=502.1 km, Rmss=0.96 sec, Gp= 18°,
M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=B
Source
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event IDusc0007ir5
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Earthquake Summary

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Tectonic Summary

The January 10, 2012 earthquake off the west coast of northern Sumatra, Indonesia, occurred as a result of strike-slip faulting within the oceanic lithosphere of the Indo-Australia plate, approximately 100 km to the southwest of the major subduction zone that defines the plate boundary between the Indo-Australia and Sunda plates offshore Sumatra. At the location of this earthquake, the Indo-Australia plate moves north-northeast with respect to the Sunda plate at a velocity of approximately 52 mm/yr.

While they are rare, large strike-slip earthquakes are not unprecedented in this region of the Indo-Australian plate. Since the massive M 9.1 earthquake that ruptured a 1300 km long segment of the Sumatran megathrust plate boundary in December of 2004, two Mw 6.2 strike-slip events have occurred within 50 km of the January 10 2012 event, on April 19 2006, and October 4 2007. These events seem to align with fabric of the sea floor in the diffuse boundary zone between the Indian and Australian plates.