Menurut USGS, Gempa kali ini masih merupakan gempa susulan atau gempa terusan dari akibat gempa dec 2004 lalu. Gempa kali ini akibat strike-slip fault. Dengan rupture 15 Km sepanjang 80 Km, bandingkan dengan gempa dec 2004 yang rupture zonenya sepanjang 1200 km dengan lebar 200 Km.
RDP ======================== This earthquake occurred near the western boundary of the aftershock zone of the devastating December 26th, 2004 earthquake. The aftershock zone of the December 26th earthquake continues to be active and forms a crescent-shaped region extending about 1200 km north of Sumatra, Indonesia. The recent event was a strike-slip earthquake in the Burma plate near its boundary with the India plate. Strike-slip earthquakes generate horizontal motion across a fault. This is unlike the motion caused by the December 26th earthquake that was the result of thrust-faulting on the interface of the India plate and the Burma plate, in which the India plate thrust beneath the overriding Burma plate. Given the different mechanisms, the recent event did not occur on the same fault that caused the Great Sumatra-Andaman Islands earthquake. However, the two earthquakes are almost certainly related. A great earthquake can trigger earthquake activity on faults that are distinct from the main-shock fault plane, and separated from it by tens or even hundreds of kilometers. A magnitude 7.2 earthquake is considered a major earthquake, however the size of this recent earthquake pales in comparison to the December 26th earthquake. A 7.2 strike-slip earthquake typically ruptures a 15 km by 80 km patch along a fault, whereas the December, 2004 earthquake ruptured a patch of fault about 1200 km long and 200 km wide. --------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi Komisi Sedimentologi (FOSI) : Ratna Asharina (Ratna.Asharina[at]santos.com)-http://fosi.iagi.or.id Komisi SDM/Pendidikan : Edy Sunardi(sunardi[at]melsa.net.id) Komisi Karst : Hanang Samodra(hanang[at]grdc.dpe.go.id) Komisi Sertifikasi : M. Suryowibowo(soeryo[at]bp.com) Komisi OTODA : Ridwan Djamaluddin(ridwan[at]bppt.go.id atau [EMAIL PROTECTED]), Arif Zardi Dahlius(zardi[at]bdg.centrin.net.id) Komisi Database Geologi : Aria A. Mulhadiono(anugraha[at]centrin.net.id) ---------------------------------------------------------------------
