基于Sentinel-1A数据的四川长宁MS6.0地震同震形变场分析及断层滑动分布反演

doi:10.12196/j.issn.1000-3274.2020.03.002

摘要/Abstract

摘要： 利用大地测量数据研究2019年6月17日四川长宁M_S6.0地震同震形变场特征和发震断层参数, 基于DInSAR技术处理升降轨Sentinel-1A数据获取干涉相位图, 并考虑大气折射效应和余震形变误差实现同震形变场改正。四叉树采样后的形变数据作为反演数据源, 采用弹性半空间分层模型反演发震断层几何面滑动分布。结果表明本次地震发震机制为兼具逆冲和左旋走滑, 矩震级为M_W5.9, 断层破裂尺度达28 km×20 km, 震源深度约9.4 km。升降轨视线向同震形变场在断层两侧呈现形变特征差异, 最大沉降量分别是8.34 cm(升轨)和4.23 cm(降轨), 最大抬升量分别是5.5 cm(升轨)和7.5 cm(降轨); 发震断层走向为302°, 倾角为43°, 平均滑动角为50°, 断层面最大滑动量达到0.28 m。

关键词: 长宁M_S6.0地震, Sentinel-1A, DInSAR, 同震形变场, 滑动分布

Abstract: This paper uses geodesy method to study the coseismic deformation field characteristics and seismogenic fault parameters of the M_S6.0 earthquake in Changning, Sichuan on June 17, 2019. The ascending and descending Sentinel-1A data are processed to obtain the interferograms based on DInSAR technology, and to achieve coseismic deformation field correction by considering atmospheric refraction effect and deformation error caused by aftershocks. Based on the deformation data after quadtree sampling, the elastic half-space layered model is used to iteratively invert the slip distribution of the fault geometry.The results show a left-lateral strike-slip movement of seismogenic fault,the moment magnitude is M_W5.9, the fault rupture scale is 28 km×20 km, and the focal depth is about 9.4 km. The ascending and descending coseismic deformation fields indicate different deformation characteristics on the two sides of the fault, the maximum settlements are 8.34 cm (ascending) and 4.23 cm (descending), and the maximum uplifts are 5.5 cm (ascending) and 7.5 cm (descending) respectively. The strike of the seismogenic fault is 302°, the dip angle is 43°, the average slip angle is 50°, and the maximum slip of the fault plane is 0.28 m.

Key words: Changning M_S6.0 earthquake, Sentinel-1A, DInSAR, Coseismic deformation field, Slip distribution

中图分类号:

P315.7

孙凯, 孟国杰, 洪顺英, 黄星, 董彦芳. 基于Sentinel-1A数据的四川长宁M_S6.0地震同震形变场分析及断层滑动分布反演[J]. 地震, 2020, 40(3): 15-27.

SUN Kai, MENG Guo-jie, HONG Shun-ying, HUANG Xing, DONG Yan-fang. Coseismic Deformation and Fault Slip Inversion of the M_S6.0 Earthquake Changning, Sichuan Based on Sentinel-1A Data[J]. EARTHQUAKE, 2020, 40(3): 15-27.

参考文献 33

[1]	汪一鹏, 马瑾, 李传友. 南北地震带强震迁移特征及其与南亚地震带的联系[J]. 地震地质, 2007, 29(1): 1-14.
	WANG Yi-peng, MA Jin, LI Chuan-you. The Migration Characteristics of Strong Earthquakes on the North-South Seismic Belt and Its Relation with the South Asia Seismic Belt[J]. Seismology and Geology, 2007, 29(1): 1-14 (in Chinese).
[2]	中国地震局震害防御司. 中国近代地震目录[M]. 北京: 中国科学技术出版社, 1999.
	Department of Disaster Prevention, China Earthquake Administration. Catalog of Chinese Earthquakes[M]. Beijing: China Science and Technology Press, 1999 (in Chinese).
[3]	尹欣欣, 郭安宁, 赵韬, 等. 四川长宁MS6.0地震区域构造应力场特征分析[J]. 地震工程学报, 2019, 41(5): 1215-1220.
	YIN Xin-xin, GUO An-ning, ZHAO Tao, et al. Characteristics of the Regional Tectonic Stress Field of the Changning MS6.0 Earthquake, Sichuan Province[J]. China Earthquake Engineering Journal, 2019, 41(5): 1215-1220 (in Chinese).
[4]	李艳娥, 陈学忠. 长宁地震前应力变化及震前触发过程探索研究[J]. 国际地震动态, 2019, (8): 182.
	LI Yan-e, CHEN Xue-zhong. Study on stress change and triggering process before Changning earthquake[J]. Recent Developments in World Seismology, 2019, (8): 182 (in Chinese).
[5]	廖洪月, 朱林, 唐好丛. 电离层TEC中长期微观异常与宜宾地震[J]. 国际地震动态, 2019, (8): 181-182.
	LIAO Hong-yue, ZHU Lin, TANG Hao-cong. Medium- and long-term microscopic anomalies of ionospheric TEC and Yibin earthquake[J]. Recent Developments in World Seismology, 2019, (8): 181-182 (in Chinese).
[6]	刘洁, 赵小茂, 王新, 等. 西安毛西井水位对长宁6.0级地震的同震响应特征分析[J]. 国际地震动态, 2019, (8): 177-178.
	LIU Jie, ZHAO Xiao-mao, WANG Xin, et al. Analysis of the Coseismic Response Characteristics of the Water Level of Maoxi Well in Xi'an to the Changning M6.0 Earthquake[J]. Recent Developments in World Seismology, 2019, (8): 177-178 (in Chinese).
[7]	万永革, 胡晓辉, 刘敬光, 等. 2019四川长宁6.0级地震震源机制中心解及震源区应力场[J]. 国际地震动态, 2019, (8): 174-175.
	WAN Yong-ge, HU Xiao-hui, LIU Jing-guang, et al. The focal mechanism center solution of the 2019 Sichuan Changning M6.0 earthquake and the stress field in the earthquake zone[J]. Recent Developments in World Seismology, 2019, (8): 174-175 (in Chinese).
[8]	易桂喜, 龙锋, 梁明剑, 等. 2019年6月17日四川长宁MS6.0地震序列震源机制解与发震构造分析[J]. 地球物理学报, 2019, 62(9): 3432-3447.
	YI Gui-xi, LONG Feng, LIANG Ming-jian, et al. Focal mechanism solutions and seismogenic structure of the 17 June 2019 MS6.0 Sichuan Changning earthquake sequence[J]. Chinese Journal of Geophysics, 2019, 62(9): 3432-3447 (in Chinese).
[9]	黄辅琼, 田雷. 宜宾长宁6.0级地震的同震及临震流体异常变化及其动力学意义初析[J]. 国际地震动态, 2019, (8): 176-177.
	HUANG Fu-qiong, TIAN Lei. Analysis of co-seismic and imminent fluid anomalies of the MS6.0 earthquake Changning, Yibin, and its dynamic significance[J]. Recent Developments in World Seismology, 2019, (8): 176-177 (in Chinese).
[10]	童崇光. 四川盆地断褶构造形成机制[J]. 天然气工业, 1992, (5): 1-6.
	TONG Chong-guang. Mechanism of forming fault-folded structure in Sichuan Basin[J]. Natural Gas Industry, 1996, (5): 1-6 (in Chinese).
[11]	郭正吾, 邓康龄, 韩永辉. 四川盆地形成与演化[M]. 北京: 地质出版社, 1996.
	GUO Zheng-wu, DENG Kang-lin, HAN Yong-hui. Formation and evolution of Sichuan Basin[M]. Beijing: Geological Publishing House, 1996 (in Chinese).
[12]	覃作鹏, 刘树根, 邓宾, 等. 川东南构造带中新生代多期构造特征及演化[J]. 成都理工大学学报(自然科学版), 2013, 40(6): 703-711.
	QIN Zuo-peng, LIU Shu-gen, DENG Bin, et al. Multiphase structural features and evolution of Southeast Sichuan tectonic belt in China[J]. Journal of Chengdu University of Technology (Science & Technology Edition), 2013, 40(6): 703-711 (in Chinese).
[13]	常祖峰, 王光明. 2019年6月17日长宁M6.0地震的构造背景[J]. 国际地震动态, 2019, (8): 179-181.
	CHANG Zu-feng, WANG Guang-ming. The tectonic setting of the Changning M6.0 earthquake on June 17, 2019[J]. Recent Developments in World Seismology, 2019, (8): 179-181 (in Chinese).
[14]	何登发, 鲁人齐, 黄涵宇, 等. 长宁页岩气开发区地震的构造地质背景[J]. 石油勘探与开发, 2019, 46(5): 993-1006.
	HE Deng-fa, LU Ren-qi, HUANG Han-yu, et al. Tectonic geological background of the earthquake in Changning shale gas development area[J]. Petroleum Exploration and Development, 2019, 46(5): 993-1006 (in Chinese).
[15]	Massonnet D, Rossi M, Carmona, et al. The displacement field of the Landers earthquake mapped by radar interferometry[J]. Nature, 1993, 364(6433): 138-142.
[16]	Dong Y, Meng G, Hong S. Coseismic and Postseismic Deformation of the 2016 MS6.6 Aketao Earthquake from InSAR Observations and Modelling[J]. Pure and Applied Geophysics, 2019, (B3).
[17]	Chlieh M, Chabalier J B D, Ruegg J C, et al. Crustal deformation and fault slip during the seismic cycle in the North Chile subduction zone, from GPS and InSAR observations[M]. 2004.
[18]	Rocca F. Perspectives of Sentinel-1 for InSAR applications[C]//Geoscience and Remote Sensing Symposium (IGARSS), 2012 IEEE International. IEEE, 2012.
[19]	Fialko Y, Sandwell D, Simons M, et al. Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit[J]. Nature, 2005, 435(7040): 295-299.
[20]	Rosen P A, Gurrola E, Sacco G F, et al. The InSAR scientific computing environment[C]//EUSAR 2012; 9th European Conference on Synthetic Aperture Radar. VDE, 2012.
[21]	Farr T G, Rosen P A, Caro E, et al. The Shuttle Radar Topography Mission[J]. Reviews of Geophysics, 2007, 45(2): RG2004.
[22]	Goldstein R M, Werner C L. Radar interferogram filtering for geophysical applications[J]. Geophysical Research Letters, 1998, 25(21): 4035-4038.
[23]	于勇, 王超, 张红, 等. 基于不规则网络下网络流算法的相位解缠方法[J]. 遥感学报, 2003, 7(6): 472-477.
	YU Yong, WANG Chao, ZHANG Hong, et al. A Phase Unwrapping Method Based on Network Flow Algorithm in Irregular Network[J]. Journal of Remote Sensing, 2003, 7(6): 472-477 (in Chinese).
[24]	李陶. 重复轨道星载SAR差分干涉监测地表形变研究[D]. 湖北: 武汉大学, 2004.
	LI Tao. Study on Surface Deformation Monitoring by Repeat Pass Spaceborne SAR Differential Interferograms[D]. Hubei: Wuhan University, 2004 (in Chinese).
[25]	Li Z, Fielding E J, Cross P, et al. Interferometric synthetic aperture radar atmospheric correction: Medium Resolution Imaging Spectrometer and Advanced Synthetic Aperture Radar integration[J]. Geophysical Research Letters, 2006, 33(6): 272-288.
[26]	Li Z, Fielding E J, Cross P, et al. Interferometric synthetic aperture radar atmospheric correction: GPS topography-dependent turbulence model[J]. Journal of Geophysical Research Solid Earth, 2006, 111(B2).
[27]	Yu C, Penna N T, Li Z. Generation of real-time mode high-resolution water vapor fields from GPS observations[J]. Journal of Geophysical Research: Atmospheres, 2017, 122(3): 2008-2025.
[28]	Wells B D L, Coppersmith K J. New Empirical Relationships among Magnitude, Rupture Length, Rupture Width, Rupture Area, and Surface Displacement[J]. Bulletin of the Seismological Society of America, 1994, 84(4): 974-1002.
[29]	Seth S, Dominic L, Michael W, et al. An Introduction to Seismology, Earthquakes, and Earth Structure[M]//An introduction to seismology, earthquakes, and earth structure. Blackwell Pub. 2003.
[30]	Wang R, Lorenzo-Martín F, Roth F. PSGRN/PSCMP—a new code for calculating co- and post-seismic deformation, geoid and gravity changes based on the viscoelastic-gravitational dislocation theory[J]. Computers & Geosciences, 2006, 32(4): 527-541.
[31]	Okada Y. 1992. Surface deformation due to shear and tensile faults in a half-space[J]. Bulletin of the Seismological Society of America, 82(2): 1018-1040.
[32]	Jonsson S. Fault Slip Distribution of the 1999 MW7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements[J]. Bull.seismol.soc.am, 2002, 92(4): 1377-1389.
[33]	Wang R, Diao F, Hoechner A. SDM-A geodetic inversion code incorporating with layered crust structure and curved fault geometry[C]//Egu General Assembly Conference. 2013.