April 6, 2010 Earthquake: Sumatra, Indonesia

Felt Reports

Felt (V) at Meulaboh and Sibolga; (IV) at Banda Aceh and Medan; (III) at Padangsidempuan, Samosir and Tarutung. Also felt at Belawan, Duri, Lhokseumawe and Padang. Felt at Bandung and Jakarta, Java and at Kuta, Bali. Felt (IV) at Butterworth and Perai; (III) at Ayer Itam, Gelugor Estate, George Town, Sungai Ara and Tanjong Bunga Estate; (II) at Banting, Kuala Lumpur, Petaling Jaya and Tanjong Malim, Malaysia. Felt along the west coast of Peninsular Malaysia and (II) in Singapore. Also felt at Male, Maldives. A tsunami was recorded along the coast of Sumatra with heights (center-to-peak) at the following tide stations: 44 cm at Meulaboh, 19 cm at Sibolga, 17 cm at Telukdalam, 7 cm at Padang and 7 cm on Pulau Tanahbalah.

Tectonic Summary

The Banyak Islands, Sumatra earthquake of April 6, 2010 occurred as a result of thrust faulting on or near the subduction interface plate boundary between the Australia-India and Sunda plates. At the location of this earthquake, the Australia and India Plates move north-northeast with respect to the Sunda plate at a velocity of approximately 60-65 mm/yr. On the basis of the currently available fault mechanism information and earthquake depth, it is likely that this earthquake occurred along the plate interface.

The subduction zone surrounding the immediate region of this event last slipped during the Mw 8.6 earthquake of March 2005, and today's event appears to have occurred within the rupture zone of that earthquake. Today's earthquake is the latest in a sequence of large ruptures along the Sunda megathrust, including two M 7.4 earthquakes beneath Simeulue 125 km to the north in 2002 and 2008; a M 9.1 earthquake that ruptured to within 125 km north of this earthquake in 2004; a M 8.5 375 km to the south in 2007; and a M 7.5 260 km to the south near Padang in 2009.

(above from reference #1053)

Seriously Injured: 5 people; Slightly Injured: 17 people. Houses Damage: In Simeulue Regency: Severely Damaged: 64. Moderately Damaged: 275. Minor Damage: 674 (reference #14350)