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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Review of the source characteristics of the Great Sumatra-Andaman Islands earthquake of 2004
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Review of the source characteristics of the Great Sumatra-Andaman Islands earthquake of 2004

机译：2004年苏门答腊-安达曼群岛大地震的震源特征回顾

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摘要

The December 26, 2004 Sumatra - Andaman Island earthquake, which ruptured the Sunda Trench subduction zone, is one of the three largest earthquakes to occur since global monitoring began in the 1890s. Its seismic moment was M-0 = 1.00 x 10(23) - 1.15 x 10(23) Nm, corresponding to a moment-magnitude of M-w = 9.3. The rupture propagated from south to north, with the southerly part of fault rupturing at a speed of 2.8 km/s. Rupture propagation appears to have slowed in the northern section, possibly to similar to 2.1 km/s, although published estimates have considerable scatter. The average slip is similar to 5 m along a shallowly dipping (8 degrees), N31 degrees W striking thrust fault. The majority of slip and moment release appears to have been concentrated in the southern part of the rupture zone, where slip locally exceeded 30 m. Stress loading from this earthquake caused the section of the plate boundary immediately to the south to rupture in a second, somewhat smaller earthquake. This second earthquake occurred on March 28, 2005 and had a moment-magnitude of M-w = 8.5.
机译：自从1890年代开始全球监测以来，苏门答腊-安达曼岛地震（2004年12月26日）破裂，是zone他海沟俯冲带的破裂。其地震矩为M-0 = 1.00 x 10（23）-1.15 x 10（23）Nm，对应于M-w = 9.3的矩震级。断裂从南向北传播，断裂的南端以2.8 km / s的速度破裂。尽管已公布的估计值有相当大的分散性，但北部地区的破裂传播似乎已经放缓，可能接近2.1 km / s。沿一个浅倾角（N8，W31）撞击的冲断层，平均滑动量类似于5m。大部分的滑移和弯矩释放似乎集中在破裂带的南部，那里的滑移局部超过30 m。这次地震带来的应力负荷导致板块边界的部分立即向南破裂，而第二次地震规模较小。第二次地震发生在2005年3月28日，矩震级M-w = 8.5。

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