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The September 2007 Sumatra earthquakes were a series of megathrust earthquakes that struck the Sunda Trench off the coast of Sumatra, Indonesia, three greater than magnitude 7. A series of tsunami bulletins was issued for the area. The most powerful of the series had a magnitude of 8.5, which makes it in the top 20 of the largest earthquakes ever recorded on a seismograph. == Timeline == The first earthquake occurred at 11:10:26 UTC (18:10 local time) on 12 September 2007, and was an 8.5 Mw〔〔 earthquake on the moment magnitude scale. It was centered about 34 km underground, at , about 130 km southwest of Bengkulu on the southwest coast of Sumatra, Indonesia, and some 600 km west-northwest of Indonesia's capital city, Jakarta. It was followed by several earthquakes of magnitude 5 through 6 along the same fault, west of Sumatra. The second largest earthquake, 7.9 Mw,〔(KEP. MENTAWAI REGION, INDONESIA ), USGS〕 occurred later the same day at 23:49:04 UTC (06:49:04 local time the following day). It was centred about 10 km underground, at , some south-southeast of Padang, Indonesia and about 205 km northwest of Bengkulu (about 225 km northwest of the magnitude 8.5 earthquake). After further aftershocks above magnitude 5, a third earthquake, 7.0 Mw,〔(Magnitude 7.0 - KEPULAUAN MENTAWAI REGION, INDONESIA ), USGS〕 occurred at 03:35:26 UTC (10:35:26 local time) on 13 September. It was centred about 10 km underground, at , some 165 km south-southwest of Padang and 345 km west-northwest of Bengkulu. Aftershocks continued into 13 September and 14 September, with more earthquakes ranging up to magnitude 6.4.〔(Latest Quakes +5.0M ) USGS〕 Most of the aftershocks have been northwest of the original magnitude 8.5 earthquake. A 6.7 struck Southern Sumatra on Sept 20, 2007. Tidal buoys〔(DART Buoy Station 23401 - 600 NM West-Northwest of Phuket, Thailand )〕 positioned in the Indian Ocean and other seismic tools have led scientists to issue a series of tsunami bulletins.〔(Message indian.2007.09.13.002807 Pacific Tsunami Warning Center, NWS ), NWS PTWC〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「September 2007 Sumatra earthquakes」の詳細全文を読む スポンサード リンク
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