THE 2008 AND 2009 QAIDAM, CHINA EARTHQUAKES:INSAR ANALYSIS FOR COSEISMIC DISPLACEMENTS AND INVERSION FOR FAULT MODELS

doi:10.3969/j.issn.0253-4967.2017.03.004

SEISMOLOGY AND GEOLOGY ›› 2017, Vol. 39 ›› Issue (3): 485-496.DOI: 10.3969/j.issn.0253-4967.2017.03.004

THE 2008 AND 2009 QAIDAM, CHINA EARTHQUAKES:INSAR ANALYSIS FOR COSEISMIC DISPLACEMENTS AND INVERSION FOR FAULT MODELS

XU Xiao-bo^1,2, SHAN Xin-jian¹, QU Chun-yan¹, ZHANG Guo-hong¹, MA Chao³, SONG Xiao-gang¹, ZHANG Gui-fang¹, WEN Shao-yan¹

1 State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2 School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
3 School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China

Received:2015-06-24 Revised:2017-02-12 Online:2017-06-20 Published:2017-07-20

2008、2009年柴达木盆地地震群InSAR分析及同震形变场反演

徐小波^1,2, 单新建¹, 屈春燕¹, 张国宏¹, 马超³, 宋小刚¹, 张桂芳¹, 温少妍¹

1 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029;
2 苏州科技大学, 环境科学与工程学院, 苏州 215009;
3 河南理工大学, 测绘与国土信息工程学院, 焦作 454000

通讯作者: 单新建,男,研究员,E-mail:xjshan@163.com
作者简介:徐小波,男,1988年生,2015年于中国地震局地质研究所获固体地球物理学博士学位,主要从事InSAR干涉形变场分析及形变场反演等研究,E-mail:Tim-xxb@163.com。
基金资助:
地震动力学国家重点实验室自主研究课题（LED2013A02，LED2015A03）、国家自然科学基金（41140386，41374105）与中国地震局地质研究所基本科研业务专项（DFIGCEA201217）共同资助

Abstract

Abstract: This study focuses on four moderate-sized earthquakes in the northern margin of the Qaidam Basin, northeastern Tibet Plateau, China, of which one occurred in 2008, and three in 2009, respectively. We obtain coseismic displacement fields of these four events using Envisat descending ASAR data and D-InSAR technology. The results show that the 2008 earthquake has only one deformation center and the 2009 earthquakes have three deformation centers in their fields. The maximum displacement of 2008 and 2009 earthquakes are 0.097m and 0.41m in the LOS(line of sight), respectively. We invert ground displacements of these earthquakes based on elastic dislocation models to estimate slip distribution on fault planes. For the 2008 event, using a one-segment fault model, the inversion reveals peak slip of about 0.47m occurring at a depth of 19km. For the 2009 earthquakes, the ground displacement pattern observed by InSAR can be fitted by a three-segment fault model with smallest RMS of residuals. The three sectional fault model is considered the most reliable.

Key words: Qaidam Basin, InSAR deformation, slip inversion

摘要： 对发生在青藏高原东北缘-柴达木盆地北缘的4个中等震级地震分别做了研究，其中1个地震发生在2008年，另外3个发生在2009年。利用D-InSAR技术采用Envisat ASAR降轨数据获得了这4个地震的同震形变场。结果显示，2008年地震形变场只有1个形变中心，而2009年地震有3个形变中心。2008、2009年地震引起的卫星视线向最大形变分别为0.097m和0.41m。基于弹性半空间模型和InSAR获得的地表形变场，反演了断层面滑动分布。对于2008年地震，采用了一分段断层模型，反演结果得出最大滑动为0.47m，发生在地下19km处。对于2009年发生的3个地震，结合分析InSAR同震形变场后分别采用了一分段断层、两分段断层和三分段断层模型反演，结果得出三分段断层模型模拟的形变场最符合观测到的InSAR地表形变场且残差最小，认为三分段断层模型最可靠。

关键词: 柴达木盆地, InSAR形变, 滑动反演

CLC Number:

P315.2

XU Xiao-bo, SHAN Xin-jian, QU Chun-yan, ZHANG Guo-hong, MA Chao, SONG Xiao-gang, ZHANG Gui-fang, WEN Shao-yan. THE 2008 AND 2009 QAIDAM, CHINA EARTHQUAKES:INSAR ANALYSIS FOR COSEISMIC DISPLACEMENTS AND INVERSION FOR FAULT MODELS[J]. SEISMOLOGY AND GEOLOGY, 2017, 39(3): 485-496.

徐小波, 单新建, 屈春燕, 张国宏, 马超, 宋小刚, 张桂芳, 温少妍. 2008、2009年柴达木盆地地震群InSAR分析及同震形变场反演[J]. 地震地质, 2017, 39(3): 485-496.

References

邓涛, 王晓鸣. 2004. 柴达木盆地晚中新世三趾马化石［J］. 古脊椎动物学报, 42(4):316-333.
DENG Tao, WANG Xiao-ming. 2004. Late Miocene hipparion(Equidae, Mammalia)of eastern Qaidam Basin in Qinghai, China［J］. Vertebrata Palasiatica, 42(4):316-333(in Chinese).
冯万鹏, 许力生, 许忠淮等. 2009. 利用InSAR资料反演2008年西藏改则M_W6.4和M_W5.9地震的断层参数［J］. 地球物理学报, 52(4):983-993.
FENG Wan-peng, XU LI Si-sheng, XU Zhong-huai, et al. 2009. Source parameters of the 2008 GêrzêGerze M_W6.4 and M_W5.9 earthquakes from InSAR measurements［J］. Chinese Journal of Geophysics, 52(4):983-993(in Chinese).
李智敏, 屠泓为, 田勤俭, 等. 2010. 2008年青海大柴旦6.3级地震及发震背景研究［J］. 地球物理学进展, 25(3):768-774.
LI Zhi-min, TU Hong-wei, TIAN Qin-jian, et al. 2010. The 2008 M_S6.3 earthquake in the Dacaidan region, Qinghai Province and its seismotectonic setting［J］. Progress in Geophysics, 25(3):768-774(in Chinese).
张桂芳, 屈春燕, 单新建, 等. 2011. 2010年青海玉树M_S7.1地震地表破裂带和形变特征分析［J］. 地球物理学报, 54(1):121-127.
ZHANG Gui-fang, QU Chun-yan, SHAN Xin-jian, et al. 2011. The surface rupture and coseismic deformation characteristics of the M_S7.1 earthquake at Qinghai Yushu in 2010［J］. Chinese Journal of Geophysics, 54(1):121-127(in Chinese).
Elliott J R, Parsons B, Jackson J A, et al. 2011. Depth segmentation of the seismogenic continental crust:The 2008 and 2009 Qaidam earthquakes［J］. Geophysical Research Letters, 38(6):L06305.
Fang X M, Zhang W L, Meng Q Q, et al. 2007. High-resolution magnetostratigraphy of the Neogene Huaitoutala section in the eastern Qaidam Basin on the NE Tibetan plateau, Qinghai Province, China and its implication on tectonic uplift of the NE Tibetan plateau［J］. Earth and Planetary Science Letters, 258(1-2):293-306.
Feng G C, Hetland E A, Ding X L, et al. 2010. Coseismic fault slip of the 2008 M_W7.9 Wenchuan earthquake estimated from InSAR and GPS measurements［J］. Geophysical Research Letters, 37(1):L01302.
Funning G J, Parsons B, Wright T J. 2007. Fault slip in the 1997 Manyi, Tibet earthquake from linear elastic modelling of InSAR displacements［J］. Geophysical Journal International, 169(3):988-1008.
Funning G J, Parsons B, Wright T J, et al. 2005. Surface displacements and source parameters of the 2003 Bam(Iran)earthquake from Envisat advanced synthetic aperture radar imagery［J］. Journal of Geophysical Research, 110(B9):B09406.
Gan W J, Zhang P Z, Shen Z K, et al. 2007. Present-day crustal motion within the Tibetan plateau inferred from GPS measurements［J］. Journal of Geophysical Research, 112(B8):B08416.
Lin J, Stein R S. 2004. Stress triggering in thrust and subduction earthquakes and stress interaction between the southern San Andreas and nearby thrust and strike-slip faults［J］. Journal of Geophysical Research, 109(B2):B02303.
Lohman R B, Simons M. 2005. Some thoughts on the use of InSAR data to constrain models of surface deformation:Noise structure and data downsampling［J］. Geochemistry, Geophysics, Geosystems, 6(1):Q01007.
Okada Y. 1985. Surface deformation due to shear and tensile faults in a half-space［J］. Bulletin of the Seismological Society of America, 75(4):1135-1154.
Okada Y. 1992. Internal deformation due to shear and tensile fault in a half-space［J］. Bulletin of the Seismological Society of America, 82(2):1018-1040.
Shan X J, Zhang G H, Wang C S, et al. 2011. Source characteristics of the Yutian earthquake in 2008 from inversion of the co-seismic deformation field mapped by InSAR［J］. Journal of Asian Earth Sciences, 40(4):935-942.
Sun Z M, Yang Z Y, Pei J L, et al. 2005. Magnetostratigraphy of Paleogene sediments from northern Qaidam Basin, China:Implications for tectonic uplift and block rotation in northern Tibetan plateau［J］. Earth and Planetary Science Letters, 237(3-4):635-646.
Taylor M, Yin A. 2009. Active structures of the Himalayan-Tibetan orogen and their relationships to earthquake distribution, contemporary strain field, and Cenozoic volcanism［J］. Geosphere, 5(3):199-214.
Wang R, Motagh M, Walter T R. 2008. Inversion of slip distribution from co-seismic deformation data by a sensitivity-based iterative fitting method//EGU General Assembly. Geophysical Research Abstracts. EGU.
Xia W C, Zhang N, Yuan X P, et al. 2001. Cenozoic Qaidam Basin, China:A stronger tectonic inversed, extensional rifted basin［J］. AAPG Bulletin, 85(4):715-736.
Zhang G H, Qu C Y, Shan X J, et al. 2011. Slip distribution of the 2008 Wenchuan M_S7.9 earthquake by joint inversion from GPS and InSAR measurements:A resolution test study［J］. Geophysical Journal International, 186(1):207-220.

[1]	DONG Jin-yuan, LI Chuan-you, ZHENG Wen-jun, LI Tao, LI Xin-nan, REN Guang-xue, LUO Quan-xing. TECTONIC GEOMORPHIC FEATURES AND GEOLOGICAL SIGNIFICANCE OF THE SHIDIQUAN ANTICLINE IN THE NORTHERN MARGIN OF THE QAIDAM BASIN [J]. SEISMOLOGY AND GEOLOGY, 2021, 43(3): 521-539.
[2]	YAO Sheng-hai, GAI Hai-long, YIN Xiang, LIU Wei, ZHANG Jia-qing, YUAN Jian-xin. TECTONIC GEOMORPHOLOGY AND QUATERNARY SLIP RATE OF THE XITIESHAN SECTION OF THE NORTHERN MARGIN FAULT OF QAIDAM BASIN [J]. SEISMOLOGY AND GEOLOGY, 2020, 42(6): 1385-1400.
[3]	LIU Xiao-dong, SHAN Xin-jian, ZHANG Ying-feng, YIN Hao, QU Chun-yan. COSEISMIC DISPLACEMENT FIELD OF THE WENCHUAN EARTHQUAKE DERIVED FROM STRONG MOTION RECORDS AND APPLICATION IN SLIP INVERSION [J]. SEISMOLOGY AND GEOLOGY, 2019, 41(4): 1027-1041.
[4]	FU Qiang, LIU Tian-you, MA Long, YANG Yu-shan, YAN Mao-du. WAVELET TRANSFORM ANALYSES OF FAULTS DETECTION ON ISOSTATIC GRAVITY ANOMALIES: A CASE STUDY FROM THE QAIDAM BASIN AND ITS ADJACENT AREAS [J]. SEISMOLOGY AND GEOLOGY, 2019, 41(4): 960-978.
[5]	DONG Jin-yuan, LI Chuan-you, ZHENG Wen-jun, LI Tao, LI Xin-nan, ZHANG Pei-zhen, REN Guang-xue, DONG Shao-peng, LIU Jin-rui. GEOMORPHIC FEATURES AND LATE QUATERNARY SLIP RATE OF THE SOUTHERN ZONGWULONG SHAN FAULT [J]. SEISMOLOGY AND GEOLOGY, 2019, 41(2): 341-362.
[6]	LIU Yun-hua, SHAN Xin-jian, ZHANG Ying-feng, ZHAO De-zheng, QU Chun-yan. USE OF SEISMIC WAVEFORMS AND INSAR DATA FOR DETERMINATION OF THE SEISMOTECTONICS OF THE MAINLING M_S6.9 EARTHQUAKE ON NOV.18, 2017 [J]. SEISMOLOGY AND GEOLOGY, 2018, 40(6): 1254-1275.
[7]	XU Jian-hong, HUI Xu-hui, CHENG Hong-bin, ZHANG Xiao-liang, SHANG Si-qi. PALEOSEIMOLOGY AND LATE QUATERNARY SLIP RATE OF THE YOUSHASHAN FAULT AT SOUTHWESTERN MARGIN OF QAIDAM BASIN [J]. SEISMOLOGY AND GEOLOGY, 2018, 40(2): 465-479.
[8]	ZHANG Ying-feng, ZHANG Guo-hong, SHAN Xin-jian, WEN Shao-yan. THE COSEISMIC SOURCE SLIP AND COULOMB STRESS TRIGGERING OF 2015 NEPAL GORKHA M_W7.9 AND KODARIM_W7.3 EARTHQUAKE BASED ON InSAR MEASUREMENTS [J]. SEISMOLOGY AND GEOLOGY, 2017, 39(1): 104-116.

THE 2008 AND 2009 QAIDAM, CHINA EARTHQUAKES:INSAR ANALYSIS FOR COSEISMIC DISPLACEMENTS AND INVERSION FOR FAULT MODELS

2008、2009年柴达木盆地地震群InSAR分析及同震形变场反演

RichHTML

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 8

Recommended Articles

Metrics

Comments