Jakarta - An undersea earthquake registering 6.4 on the Richter scale struck the western coast of the Indonesian island of Sumatra early Thursday, but there were no immediate reports of injury or damage, the Indonesian seismologist agency said.
The quake struck at 3:01 am (2001 GMT Wednesday) and was centred in the Indian Ocean, 32 kilometres south-west of Mentawai Islands, off the western coast of Sumatra, Indonesia's National Meteorology and Geophysics Agency said in a statement.
It occurred 50 kilometres beneath the seabed, but the statement did not say if the quake caused a tsunami threat.
Indonesia, the world's largest archipelago nation, sits along the Pacific Ocean's Ring of Fire, where the meeting of continental plates causes high volcanic and seismic activity.
Date-Time Wednesday, April 15, 2009 at 20:01:33 UTC
Time of Earthquake in other Time Zones
Location 3.091°S, 100.496°E
Depth 8.5 km (5.3 miles) (poorly constrained)
Region KEPULAUAN MENTAWAI REGION, INDONESIA
Distances 210 km (130 miles) WNW of Bengkulu, Sumatra, Indonesia
235 km (145 miles) S of Padang, Sumatra, Indonesia
385 km (240 miles) WSW of Jambi, Sumatra, Indonesia
770 km (480 miles) WNW of JAKARTA, Java, Indonesia
Location Uncertainty horizontal +/- 7.7 km (4.8 miles); depth +/- 25.9 km (16.1 miles)
Parameters NST=191, Nph=191, Dmin=849.9 km, Rmss=1.13 sec, Gp= 29°,
M-type=teleseismic moment magnitude (Mw), Version=8
Source USGS NEIC (WDCS-D)
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