论文部分内容阅读
2010年10月25日印度尼西亚明打威地震(MW7.8),致使苏门答腊近海明打威群岛向海一侧的俯冲带浅部发生破裂,在巴盖群岛西南的沿海地带引发了3～9m高的海啸,并夺去了至少431人的生命。对有限断层震源破裂特征的远震P波、SH波及瑞雷波的分析说明,在倾角为10°的巨大逆冲断层上破裂过程持续了大约90s,破裂速度相对较低,约为1.5km/s,在约为100km长的震源区总滑动量约为2～4m。根据地震矩所计算的能量释放为1.4×10-6,小于2006年7月17日爪哇海啸地震(MW7.8)的能量释放量2.4×10-6。明打威地震致使2007年9月12日群岛地震(MW7.9)的滑动区上倾部位发生破裂,结合沿岛弧锡默卢岛西北方向近海的1907年1月4日(M7.6)海啸地震,说明印度尼西亚和其他地方发生特大俯冲地震的上倾地区的浅层逆冲破裂,特别容易引发海啸灾害。
The Mingwei earthquake in Indonesia (MW 7.8) on 25 October 2010 led to the rupture of the shallow subduction zone to the sea side of the Seaport Islands in the Sumatra offshore Mingui, and triggered a 3-9m high in the coastal zone south-west of the Bagai Islands Tsunami, and claimed the lives of at least 431 people. The analysis of teleseismic P-wave, SH-wave and Rayleigh wave of the rupture features of finite faults shows that the rupture process on the huge thrust with the inclination of 10 ° lasted about 90s and the rupture speed was relatively low, about 1.5km / s, the total slippage in the source area of about 100 km is about 2 ~ 4 m. The energy release calculated according to the seismic moment is 1.4 × 10-6, which is smaller than the energy release amount of 2.4 × 10-6 for the Java Tsunami Earthquake (MW 7.8) on July 17, 2006. The Mingchawei Earthquake caused a rupture of the upwelling area of the slip area on the Seismic Islands of Islands (MW 7.9) on September 12, 2007, in conjunction with the January 4, 1907 (M7.6) offshore north- The tsunami earthquake illustrates the shallow thrusting of the upwelling area where a very large subduction earthquake occurred in Indonesia and elsewhere and is particularly prone to tsunami disasters.