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2016年印尼苏门答腊岛海域M

本站小编 Free考研考试/2022-01-03

赵旭,
姚振兴
中国科学院地质与地球物理研究所, 地球与行星物理重点实验室, 北京 100029

基金项目: 国家自然基金项目(41390455,41504046)共同资助


详细信息
作者简介: 赵旭, 博士, 主要从事数字地震学方面的研究工作.E-mail:zhaox@mail.iggcas.ac.cn
中图分类号: P315

收稿日期:2016-11-09
修回日期:2017-02-25
上线日期:2018-03-05



The kinematic characteristics of the 2016 MW7.8 offshore Sumatra, Indonesia earthquake

ZHAO Xu,
YAO ZhenXing
Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China



MSC: P315

--> Received Date: 09 November 2016
Revised Date: 25 February 2017
Available Online: 05 March 2018


摘要
根据中国和全球地震台网记录的波形记录,采用W震相矩张量反演、反投影分析及有限断层模型反演方法,研究了2016年3月2日印尼7.8级地震破裂过程,分析讨论印尼地震震源运动学特征.结果表明:此地震为一次对称的双侧破裂走滑型事件,北北东─南南西向的断层节面(走向5°/倾角85°)为发震断层面.标量地震矩约6.19×1020 Nm,矩震级为7.79,最大的滑动量约11 m,位于破裂起始点北东,沿着断层走向约30 km处.破裂平均速度2.0~2.2 km·s-1,破裂持续时间35 s,破裂在5~25 s内释放的能量,约占总能量的97%.最终形成了总长度90 km左右的断层.印尼地震具有破裂持续时间短、破裂速度慢、高滑动能量带相对集中等显著特点.本研究对进一步增进海洋岩石圈地震的震源特性认识有重要参考意义.
2016年印尼MW7.8地震/
震源机制解/
反投影分析/
破裂过程/
震源时间函数

We infer the rupture history of the March 2, 2016, MW7.8 Indonesia earthquake, and further analyze its kinematic characteristics, using seismic waveform inversions, which include W-phase centroid moment tensor inversion, back projection analysis, and finite fault modeling. The selected waveforms are recorded by the China Digital Seismic Network and Global Seismographic Network. The results indicate that this event is considered as a symmetric bilateral rupture source, showing a strike slip faulting. This earthquake occurs on a NNE-SSW trending rupture plane (strike=5°/dip=85°). The total scalar moment is estimated to be 6.19×1020 Nm (or moment magnitude MW7.79). The peak slip is about 11 m, which is located nearly 30 km northeast of the rupture initiation along the strike direction. The average rupture velocity ranges from 2.0 to 2.2 km·s-1 and the total duration is about 35 s. The rupture releases majority of the energy during 5~25 s, which is about 97% of the total energy. The rupture develops a fault plane over a length of about 90 km. The Indonesia earthquake has a smaller total duration, a lower rupture velocity and a relatively more compact slip area. This study is helpful to understand the source characteristics of the oceanic lithosphere earthquake.
The 2016 MW7.8 Indonesia earthquake/
Focal mechanism solution/
Back projection analysis/
Rupture history/
Source time function



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