Magnitude 6.6 - SUMBAWA REGION, INDONESIA
2009 November 08 19:41:46 UTC
- This event has been reviewed by a seismologist.
|Depth||32.9 km (20.4 miles)|
|Region||SUMBAWA REGION, INDONESIA|
|Distances||25 km (15 miles) NNW of Raba, Sumbawa, Indonesia|
305 km (190 miles) ENE of Mataram, Lombok, Indonesia
340 km (210 miles) W of Ende, Flores, Indonesia
1335 km (830 miles) E of JAKARTA, Java, Indonesia
|Location Uncertainty||horizontal +/- 7.5 km (4.7 miles); depth +/- 16 km (9.9 miles)|
|Parameters||NST=242, Nph=242, Dmin=380.4 km, Rmss=1.14 sec, Gp= 25°,|
M-type=centroid moment magnitude (Mw), Version=7
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The November 8th, 2009 earthquake in the Sumbawa region of Indonesia occurred as a result of thrust faulting on or near a microplate boundary within the Sunda plate. Eastern Indonesia is characterized by complex tectonics in which motions of numerous small plates are accommodating large-scale convergence between the Australian and Sunda plates. In the region of this earthquake, the Australian plate moves northeastwards with respect to the Sunda plate at a rate of approximately 75 mm/yr. The convergence across this plate boundary has caused two oppositely oriented thrust zones; in the south, Australian plate subducts beneath Sunda towards the north at the Java Trench, while on the northern side of the eastern Sunda Arc near the location of the November 8th earthquake, oceanic crust of the Flores Basin subducts to the south along the Flores Thrust.
Earthquakes are fairly common in the region of this event, where 10 events of a similar size to this earthquake have occurred in the last decade. In December 1992, a large M 7.8 earthquake occurred approximately 350 km to the east of this event, causing over 2,500 fatalities and leaving 90,000 homeless both from earthquake shaking effects and from a resulting large tsunami.
Scientific & Technical 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The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver