Magnitude 7.3 - SOUTHERN SUMATRA, INDONESIA
2004 July 25 14:35:18 UTC
- This event has been reviewed by a seismologist.
|Depth||576 km (357.9 miles) set by location program|
|Region||SOUTHERN SUMATRA, INDONESIA|
|Distances|| 105 km (65 miles) NW of Palembang, Sumatra, Indonesia|
105 km (65 miles) SSE of Jambi, Sumatra, Indonesia
415 km (255 miles) S of SINGAPORE
510 km (315 miles) NW of JAKARTA, Java, Indonesia
|Location Uncertainty||horizontal +/- 5.1 km (3.2 miles); depth fixed by location program|
|Parameters||NST=334, Nph=334, Dmin=201.3 km, Rmss=0.86 sec, Gp= 40°,|
M-type=teleseismic moment magnitude (Mw), Version=S
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Felt (IV) at Bengkulu and (III) at Padangpanjang. Felt (III) at Bandung, Bogor, Sawahan and Sukabumi; (II) at Jakarta, Java. Also felt (III) at Mataram, Lombok. Felt throughout Bali, Java, Lombok and Sumatra. Also felt in southern Johor, Malaysia and on Singapore.
The earthquake occurred deep beneath the island of Sumatra, which is one of many islands in the large Indonesian island-arc system. Off the southwest coast of Sumatra, the Indo-Australian Plate subducts northwards beneath the Eurasian Plate at a rate of about 6 cm/yr. At the earth's surface, the boundary between the plates is marked by the 3400 km long Java (Sunda) Trench. The subducted Indo-Australian plate has previously been known to be seismically active to a depth of about 650 km beneath Java, but this magnitude 7.3 earthquake is one of the few to occur below 300 km beneath the island of Sumatra. Due to the earthquake's depth it was felt over a large area, but caused little damage.
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver