2015年尼泊尔M_w7.9地震破裂过程:快速反演与初步联合反演

doi:10.6038/cjg20150530

CORC > 北京大学 > 地球与空间科学学院

	2015年尼泊尔M_w7.9地震破裂过程:快速反演与初步联合反演; Rupture process of the 2015 Nepal M(w)7. 9 earthquake: Fast inversion and preliminary joint inversion
	张勇 ; 许力生 ; 陈运泰
刊名	地球物理学报
	2015
关键词	波形反演破裂过程 2015尼泊尔地震 Waveform inversion Rupture process The 2015 Nepal earthquake GREENS-FUNCTIONS GPS
DOI	10.6038/cjg20150530
英文摘要	本文介绍了2015年4月25日尼泊尔M_w7.9(M_s8.1)地震发生后的破裂过程快速反演工作,以及后续开展的地震波与少量GPS资料的初步联合反演工作.两项工作得到的反演结果尽管在最大滑动量估计方面存在一些差别,但都一致地显示此次地震是发生在低倾角俯冲断裂上的一次单侧破裂事件,破裂主要朝东南方向传播;断层滑动主要发生在震中至加德满都一带.在加德满都附近区域,其下方破裂与朝东南传播的地震波的多普勒聚焦效应可能造成较强的震感和较大的破坏.对比历史大地震发现,2015年尼泊尔M_w7.9地震的浅部破裂紧邻1934年M_w8.2地震的地表破裂,余震分布与1833年M7.6地震的宏观震中基本重合,其破裂填补了前两次地震破裂以西100km左右的空区,表明此次地震是1934年M_w8.2地震与1833年M7.6地震向西继续延伸的结果.; As a routine work for earthquake emergency response, we have performed fast inversions of rupture processes for large earthquakes since the 2008 Wenchuan M(w)7. 9 earthquake. About 2. 15 hours after the 2015 Nepal Mw7. 9 earthquake, we determined the rupture model by inverting teleseismic P waves. From the obtained rupture images, the earthquake was a unilateral rupture event and ruptures mainly propagated to the southeast. So we concluded that the earthquake may cause relatively terrible damages around Kathmandu area due to nearby ruptures and Doppler effects of the southeastward rupture propagations. After the fast inversion, we collected more seismic data and a few GPS data (two stations), and carried out a joint inversion of rupture process. The joint model well confirms the major source characteristics, e. g. southeastward rupture propagation, and displays a larger peak slip (about 5. 2 m) than that of the fast estimated model (about 2. 0 m). The source duration is about 80 s, with the major sub-event occurred at 0 similar to 45 s. At 60 similar to 70 s, a small-scale sub-event occurs in very shallow depth about 100 km along the strike direction, and may cause a few surface breakages. From comparisons with historical large earthquakes, the 2015 Nepal M(w)7. 9 earthquake ruptured an area, with a dimension of about 100 km, to the west of the 1833 M7. 6 earthquake and the 1934 M(w)8. 2 earthquake. The shallow ruptures are very close to the surface ruptures of the 1934 M(w)8. 2 earthquake, and the aftershocks are around the macroseismic epicenter of the 1833 M7. 6 earthquake. It is highly probable that ruptures of the three earthquakes have connected. From this perspective, the 2015 Nepal earthquake is the result of the westward rupture extensions of the 1833 and 1934 events.; 国家自然科学基金,地震行业基金; SCI(E); EI; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); zhygn@163.com; 5; 1804-1811; 58
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/414912]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	张勇,许力生,陈运泰. 2015年尼泊尔M_w7.9地震破裂过程:快速反演与初步联合反演, Rupture process of the 2015 Nepal M(w)7. 9 earthquake: Fast inversion and preliminary joint inversion[J]. 地球物理学报,2015.
APA	张勇,许力生,&陈运泰.(2015).2015年尼泊尔M_w7.9地震破裂过程:快速反演与初步联合反演.地球物理学报.
MLA	张勇,et al."2015年尼泊尔M_w7.9地震破裂过程:快速反演与初步联合反演".地球物理学报 (2015).