联合地震波和大地测量数据反演2015年皮山MW6.4地震的同震破裂分布

doi:10.3969/j.issn.0253-4967.2019.01.009

地震地质 ›› 2019, Vol. 41 ›› Issue (1): 137-149.DOI: 10.3969/j.issn.0253-4967.2019.01.009

联合地震波和大地测量数据反演2015年皮山M_W6.4地震的同震破裂分布

陈云锅¹, 何平¹, 丁开华^1,2,3, 李水平¹, 王琪¹

1. 中国地质大学(武汉)地球物理与空间信息学院, 地球内部多尺度成像湖北省重点实验室, 武汉 430074;
2. 中国地质大学(武汉)信息工程学院, 武汉 430074;
3. 武汉大学地球空间环境与大地测量教育部重点实验室, 武汉 430079

收稿日期:2018-04-10 修回日期:2018-09-27 出版日期:2019-02-20 发布日期:2019-03-27
通讯作者: 何平,男,1985年生,中国地质大学(武汉)地球物理与空间信息学院固体地球物理系副教授,主要研究方向为构造大地测量与地震活动,E-mail:phe@cug.edu.cn
作者简介:陈云锅,男,1992年生,中国地质大学(武汉)地球物理与空间信息学院地球物理学专业在读硕士研究生,主要从事地震形变与地震活动的研究,电话:18202792541,E-mail:18202792541@163.com。
基金资助:
国家自然科学基金项目（41704005）和中央高校基本科研业务费专项（CUGL160225，G1323531878）共同资助

GEODETIC AND TELESEISMIC CONSTRAINTS ON SLIP DISTRIBUTION OF 2015 M_W6.4 PISHAN EARTHQUAKE

CHEN Yun-guo¹, HE Ping¹, DING Kai-hua^1,2,3, LI Shui-ping¹, WANG Qi¹

1. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;
2. Faculty of Information Engineering, China University of Geosciences, Wuhan 430074, China;
3. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China

Received:2018-04-10 Revised:2018-09-27 Online:2019-02-20 Published:2019-03-27

摘要/Abstract

摘要： 2015年7月3日在西昆仑推覆构造带前缘发生了M_W6.4新疆皮山地震，是近40a以来该区域发生的最大的一次中强地震。文中利用近场大地测量数据，包括4个高精度GPS点和一景高空间分辨率ALOS-2 InSAR干涉数据，联合IRIS/USGS提供的25个远震台网P波数据，基于有限断层理论，采取多参数非线性模拟退火算法反演了此次地震的同震破裂模型。联合反演的断层滑移模型显示皮山地震的主破裂区深度集中于9~16km，最大滑移量为95cm，释放的矩能量相当于M_W6.42，且沿断层走向N302°W单侧破裂，与余震分布吻合。通过与单一数据源反演结果进行对比分析，文中采用的多源数据可以同时约束地震矩能量和断层破裂分布，有效解决了远震台网波形数据模型空间分辨率低（尤其对中强地震而言）和近场大地测量数据在地震矩评估方面不够精确的问题。

关键词: GPS, InSAR, 远震地震波, 同震破裂反演

Abstract: On July 3^rd, 2015, a M_W6.4 earthquake occurred on Pishan County, Xinjiang, located in the front of western Kunlun thrust belt, which is the largest earthquake(M_W6.0~7.0)in the past 40 years in this region. In this study, we collected both the near-filed geodetic coseismic deformation observations including 4 GPS sites and one high-resolution ALOS-2 InSAR imagery, and far-field teleseismic P waveforms from 25 stations provided by IRIS/USGS, to invert the fault parameters(strike and dip)and coseismic rupture model of 2015 M_W6.4 Pishan earthquake. Using the finite fault theory, a non-linear simulated annealing algorithm was employed to resolve our joint inversion problem. The strike (120°~130°) and dip angle(35°~40°)of optimal models are different from that of some previous studies, and the dip change is strongly constrained by combined data than that of strike. In fixing the geometric parameters of optimal fault model, we also considered data weight(5)(geodetic data/teleseismic P waveforms)and constrained weight from moment and smooth factor(2.5). Clearly, our results indicate that the slip distribution mainly concentrates in the depth range from 9 to 16km and a length range of 20km along the strike direction, which is similar to the spatial distribution of the relocated aftershocks. The maximum slip is~95cm. The seismic moment release is 5.45×10¹⁸N·m, corresponding to M_W6.42. Compared with the single data set, geodetic data or teleseismic waveform, our joint inversion model could simultaneously constrain the seismic moment and slip distribution well, thus avoiding effectively a lower-resolution rupture distribution determined by teleseismic-only inversion and a bias released moment estimated by the geodetic-only inversion. Importantly, we should consider both the near-field geodetic data and far-field teleseismic data in retrieving the rupture model for accurately describing the seismogenic structure of active fault in western Kunlun region.

Key words: GPS, InSAR, teleseismic waveform, coseismic rupture inversion

中图分类号:

P315.2

陈云锅, 何平, 丁开华, 李水平, 王琪. 联合地震波和大地测量数据反演2015年皮山M_W6.4地震的同震破裂分布[J]. 地震地质, 2019, 41(1): 137-149.

CHEN Yun-guo, HE Ping, DING Kai-hua, LI Shui-ping, WANG Qi. GEODETIC AND TELESEISMIC CONSTRAINTS ON SLIP DISTRIBUTION OF 2015 M_W6.4 PISHAN EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2019, 41(1): 137-149.

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联合地震波和大地测量数据反演2015年皮山M_W6.4地震的同震破裂分布

GEODETIC AND TELESEISMIC CONSTRAINTS ON SLIP DISTRIBUTION OF 2015 M_W6.4 PISHAN EARTHQUAKE

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联合地震波和大地测量数据反演2015年皮山M_W6.4地震的同震破裂分布

GEODETIC AND TELESEISMIC CONSTRAINTS ON SLIP DISTRIBUTION OF 2015 M_W6.4 PISHAN EARTHQUAKE