| 2016年日本熊本地震破裂时空过程联合反演 |
| |
| 引用本文： | 蒋生淼,易磊,张旭,温扬茂.2016年日本熊本地震破裂时空过程联合反演[J].地震学报,2018,40(1):13-23. |
| |
| 作者姓名： | 蒋生淼 易磊 张旭 温扬茂 |
| |
| 作者单位： | 1.中国北京 100081中国地震局地球物理研究所 |
| |
| 摘 要： | 为了深入认识2016年4月15日日本熊本地震破裂的复杂性，利用远场体波资料和同震InSAR资料联合反演了此次地震的震源破裂时空过程. 联合反演结果表明:熊本地震的震源破裂持续时间约为25 s，整个破裂过程释放的总标量矩为6.03×1019 N·m，对应于矩震级MW7.1；同震滑动主要集中分布于浅部，破裂以右旋走滑为主，但在沿倾向0—5 km范围内，破裂呈较强的正断特征；此次地震破裂的最大同震滑动量约为4.9 m，且最大同震位错区位于背离断层走向上、距离起始破裂点约5—10 km的区域；破裂前期（0—7 s），在倾向上向浅表发生破裂，在走向上向东北和西南两侧扩展；大约7 s后，破裂背离断层走向主要向东北方向扩展. 根据有限断层联合反演结果推测，此次熊本地震破裂可能出露至地表.
|
| 关 键 词： | 2016年熊本地震 远场体波 同震InSAR资料 地震破裂过程 联合反演 |
| 收稿时间： | 2017-04-17 |
Joint inversion of teleseismic and co-seismic InSAR data for the rupture process of the 2016 Kumamoto earthquake in Japan |
| |
| Affiliation: | 1.Institute of Geophysics，China Earthquake Administration，Beijing 100081，China2.School of Geodesy and Geomatics，Wuhan University，Wuhan 430079，China |
| |
| Abstract: | On April 15, 2016, a disastrous earthquake struck Kumamoto county in Japan. Aiming to further understand the complexity of the earthquake rupture in detail, we conduct a joint inversion of teleseismic waveforms and co-seismic InSAR data for the spatio-temporal rupture process of this earthquake. The results show that, the whole process lasted for about 25 s and released scalar moment up to 6.03×1019 N·m, corresponding to moment magnitude MW7.1. The major co-seismic slip distribution was centered in shallow region, and it was dominated by dextral strike. But the rupture had strong normal characteristics in the range of 0?5 km along the dip direction. The maximum co-seismic slip is about 4.9 m, and the major rupture patch was about 5?10 km away from the initial rupture point opposite to the strike direction. In the early stage （0?7 s）, it ruptured toward to the shallow region along the dip direction, and ruptured bilaterally along strike direction; about 7 s later, it ruptured toward to the northeast opposite to the strike direction. The joint inversion results suggest that the Kumamoto earthquake may rupture to the earth surface. |
| |
| Keywords: | |
|
| 点击此处可从《地震学报》浏览原始摘要信息 |
|
点击此处可从《地震学报》下载全文 |
|
