Magnitude 7.2 - OFF THE WEST COAST OF NORTHERN SUMATRA
2012 January 10 18:36:59 UTC
- This event has been reviewed by a seismologist.
|Depth||20.5 km (12.7 miles)|
|Region||OFF THE WEST COAST OF NORTHERN SUMATRA|
|Distances||423 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 Uncertainty||horizontal +/- 13.1 km (8.1 miles); depth +/- 4.8 km (3.0 miles)|
|Parameters||NST=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
- Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.
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.
Scientific & Technical Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver