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Powerful earthquake, small tsunamis hit Sumatra JAKARTA - A small tsunami was recorded after a powerful earthquake struck off the western coast of Sumatra, officials said, but there were no immediate reports of damage or casualties. The 7.2-magnitude earthquake at 9.42 p.m. local time (1442 GMT) was centered just off the Mentawai Islands, about 240 kilometers south of Padang, the capital and largest city of West Sumatra.

It struck about 10 kilometers (6.2 miles) deep, making it a shallow earthquake, according to the country's seismological agency. The Indonesian agency immediately issued a tsunami warning for nearby coastlines, prompting residents in the region to flee coastlines in fear of a tsunami. The Pacific Tsunami Warning Center issued a tsunami watch, but both alerts were canceled about an hour later.

While no destructive widespread tsunami was generated, the Pacific Tsunami Warning Center said it recorded several small tsunamis. While relatively small, the tsunami was large enough to travel hundreds of kilometers (miles) from the earthquake epicenter.

"A significant tsunami was generated by this earthquake," the Honolulu-based agency said. "However, sea level readings now indicate that the threat has diminished or is over for most areas. Therefore the tsunami watch issued by this center is now cancelled." A tsunami expert at the agency told BNO News that the largest tsunami recorded was about half a meter high, which is measured relative to normal sea level and is not crest-to-trough wave height.

According to the center, small tsunamis were recorded in Tanahbalah, Padang and Enggano in Indonesia. Additionally, a small 11 centimeters (0.4 feet) tsunami was recorded on the Cocos Islands of Australia, indicating the tsunami traveled hundreds of kilometers (miles) across the ocean.

There were no immediate reports of damage or casualties as a result of both the tsunamis as well as the earthquake, which the United States Geological Survey (USGS) measured at 7.5 on the Richter scale, considerably stronger than Indonesia's estimate.

But both the USGS and the United Nations Office for the Coordination of Humanitarian Affairs said no severe damage or casualties were expected from the earthquake. "There is a low likelihood of casualties and damage," the USGS said.

The agency estimated that approximately 11,000 people may have perceived 'very strong' shaking, which could result in moderate to heavy damage. Another 6.5 million people may have felt 'weak' to 'strong' shaking, which is unlikely to result in damage.

Six aftershocks were recorded in the hours after the earthquake, with the strongest being a 6.2 on the Richter scale that struck at 2.37 a.m. local time on Tuesday. The other aftershocks had magnitudes of 5.5, 5.0, 5.0, 5.0 and 5.1.


Related link Related link:
78 km S.W. of Pagai, Mentawai, Western Sumatra

Related blog entries (category 'Earthquake') Related blog entries (category 'Earthquake'):
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12 October 2010 · Strong earthquake hits eastern Indonesia, no damage expected
30 September 2010 · No tsunami after 7.4 magnitude quake off Papua
21 August 2010 · 5.0 magnitude quake shakes Yogyakarta
18 June 2010 · Districts in Yapen Waropen isolated by earthquakes
16 June 2010 · Three dead, damage after Papua earthquakes

Related blog entries (category 'Earthquake') Tags: Mentawai, tsunami


Posted in Earthquake @ 26 October 2010 04:10 CET by Jeroen · 'Blog' RSS feed · permalink

indahnesia.com lists all earthquakes that occur in Indonesia. For your convenience we display them in a list and a Google Map. It is as accurate and recent as you can imagine as we check for updates every few minutes. If an earthquake occurs in Indonesia, this is the place to check it out in the first place.






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