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| depth = | magnitude = 6.8 | countries affected = Japan | casualties = 40 killed, 3,183 injured }} The occurred in Niigata Prefecture, Japan, at 17:56 local time (08:56 UTC) on Saturday, October 23, 2004. The Japan Meteorological Agency (JMA) named it the . Niigata Prefecture is located in the Hokuriku region of Honshu, the largest island of Japan. The initial earthquake had a magnitude of 6.8 and caused noticeable shaking across almost half of Honshu, including parts of the Tōhoku, Hokuriku, Chūbu, and Kantō regions. == Details == The first quake struck the Chuetsu area of Niigata Prefecture, Japan with a reading of 7 on the Japanese ''shindo'' intensity scale at Kawaguchi, Niigata. The moment magnitude of the earthquake is estimated at 6.8. For comparison, the Great Hanshin earthquake, which devastated much of Kobe, measured 7 on the ''shindo'' scale, with a magnitude of 7.2. The earthquake occurred at a depth of 15.8 km. The JMA gave the coordinates of the earthquake as . A second earthquake occurred at 18:12, 16 minutes after the first. This one, at a much shallower depth, had a ''shindo'' intensity of 6+ and a magnitude of 5.9. A third, at 6:34, had a ''shindo'' intensity of 6−. At 19:46, another intensity 6− earthquake occurred. Intervening and subsequent earthquakes of lesser intensity also shook the region. During the first 66 hours, 15 earthquakes with intensities of ''shindo'' 5− or higher rocked the Chuetsu region. In a press release, the Geographical Survey Institute (GSI) of the Government of Japan published preliminary estimates that a fault having a length of 22 km and a width of 17 km moved approximately 1.4 m. This was the deadliest earthquake to strike Japan since the January 1995 Great Hanshin earthquake. 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「2004 Chūetsu earthquake」の詳細全文を読む スポンサード リンク
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