Acta Geodaetica et Cartographica Sinica >

2015 , Vol. 44 >Issue 6: 649 - 654

DOI: https://doi.org/10.11947/j.AGCS.2015.20140349

The 2007 Ali Earthquake Inversion from Ascending and Descending InSAR Observations

  • WEN Yangmao ,
  • XU Caijun ,
  • LIU Yang ,
  • FENG Wanpeng ,
  • LI Zhicai
Expand
  • 1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
    2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China;
    3. School of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, UK;
    4. Department of Geodesy, National Geomatics Center of China, Beijing 100048, China

Received date: 2014-07-16

  Revised date: 2014-12-20

  Online published: 2015-07-28

Supported by

The National Basic Research Program of China(973 Program) (No.2013CB733304);The National Natural Science Foundation of China (Nos.41204010;41274032;41274030;41404007;41431069);The Special Earthquake Industry Research Project (No.201308009);The China Postdoctoral Science Foundation (No.2013M542062);The Fundamental Research Funds for the Central Universities (No.2042014kf0055)

Fold

Abstract

On 5th May, 2007, a Mw6.1 earthquake occurred in the Ali region, China. In this study, ascending and descending tracks of ASAR images collected by Envisat satellite are employed to derive the precise coseismic surface displacements, then nonlinear MPSO algorithm and linear least-square method with elastic half-space dislocation model are used to estimate the fault geometry and coseismic slip distribution. Our model suggests that the distributed slip mode can fit the observations very well. The earthquake fault is a normal fault with a strike of 158°, a dip of 43° and dipping to southwest. The slip mainly occurs within 7~12 km along the orientation, with a maximum slip of 0.3 m at a depth of 9 km. The determined geodetic moment is 1.24×1018 Nm, which is consistent with seismological results.

Key words： Ali earthquake; InSAR; slip distribution inversion; focal mechanism

Cite this article

WEN Yangmao , XU Caijun , LIU Yang , FENG Wanpeng , LI Zhicai . The 2007 Ali Earthquake Inversion from Ascending and Descending InSAR Observations[J]. Acta Geodaetica et Cartographica Sinica, 2015 , 44(6) : 649 -654 . DOI: 10.11947/j.AGCS.2015.20140349

References

[1] ELLIOTT J R, WALTERS R J, ENGLANDP C, et al. Extension on the Tibetan Plateau: Recent Normal Faulting Measured by InSAR and Body Wave Seismology[J]. Geophysics Journal International, 2010, 183(2): 503-535.
[2] HAN Tonglin. Active Tectonic of Xizang[M]. Beijing: The Geological Publishing House, 1987. (韩同林. 西藏活动构造[M]. 北京: 地质出版社, 1987.)
[3] WEN Yangmao, XU Caijun. Ms 7.9 Mani Earthquake Slip Distribution Inversion by a Sensitivity-based Iterative Fitting Method[J]. Geomatics and Information Science of Wuhan University, 2009, 34(6): 732-735. (温扬茂, 许才军. 基于敏感度的迭代拟合法反演玛尼Ms 7.9级地震滑动分布[J]. 武汉大学学报: 信息科学版, 2009, 34(6): 732-735.)
[4] WEN Yangmao, XU Caijun, LIU Yang, et al. Source Parameters of 2008 Qinghai Dachaidan Mw 6.3 Earthquake from InSAR Inversion and Automated Fault Discretization Method[J]. Geomatics and Information Science of Wuhan University, 2012, 37(4): 458-462. (温扬茂, 许才军, 刘洋, 等. 利用断层自动剖分技术的2008年青海大柴旦Mw 6.3级地震InSAR反演研究[J]. 武汉大学学报: 信息科学版, 2012, 37(4): 458-462.)
[5] WANG Leyang, XU Caijun, WEN Yangmao. Fault Parameters of 2008 Qinghai Dacaidan Mw 6.3 Earthquake from STLN Inversion and InSAR Data[J]. Acta Geodaetica et Cartographica Sinica, 2013, 42(2): 168-176. (王乐洋, 许才军, 温扬茂. 利用STLN和InSAR数据反演2008年青海大柴旦Mw 6.3级地震断层参数[J]. 测绘学报, 2013, 42(2): 168-176.)
[6] 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.
[7] WERNER C, WEGMULLER, STROZZI T, et al. GAMMA SAR and Interferometric Processing Software[C]//Proceedings of the ERS-ENVISAT Symposium. Gothenburg:[s.n.], 2000.
[8] MASSONNET D, ROSSI M, CARMONA C, et al. The Displacement Field of the Landers Earthquake Mapped by Radar Interferometry[J]. Nature, 364(6433): 138-142.
[9] FARRT G, ROSENP A, CARO E, et al. The Shuttle Radar Topography Mission[J]. Reviews of Geophysics, 2007, 45(2): 20-24.
[10] WEN Y, XU C, LIU Y, et al. Coseismic Slip in the 2010 Yushu Earthquake (China), Constrained by Wide-swath and Strip-map InSAR[J]. Natural Hazards and Earth System Sciences, 2013, 13: 35-44.
[11] HANSSEN R F. Radar Interferometry: Data Interpretation and Error Analysis[M]. New York: Kluwer Academic Publishers, 2001.
[12] LOHMAN R B, SIMONS M. Some Thoughts on the Use of InSAR Data to Constrain Models of Surface Deformation: Noise Structure and Data Down Sampling[J]. Geochemistry, Geophysics, Geosystems, 2005, 6(1), doi: 10.1029/2004GC000841.
[13] WRIGHT T J, LU Z, WICKS C. Source Model for the Mw 6.7, 23 October 2002, Nenana Mountain Earthquake (Alaska) from InSAR[J]. Geophysical Research Letters, 2003, 30(18), doi: 10.1029/2003GL018014.
[14] WEN Yangmao, HE Ping, XU Caijun, et al. Source Parameters of the 2009 L'Aquila Earthquake, Italy from ENVISAT and ALOS Satellite SAR Images[J]. Chinese Journal of Geophysics, 2012, 55(1): 53-65. (温扬茂, 何平, 许才军, 等. 联合ENVISAT和ALOS卫星影像确定 L'Aquila地震震源机制[J]. 地球物理学报, 2012, 55(1): 53-65.)
[15] OKADA Y. Surface Deformation due to Shear and Tensile Faults in a Half-space[J]. Bulletin of the Seismological Society of America, 1985, 75(4): 1135-1154.
[16] BVRGMANN R, AYHAN M E, FIELDING E J, et al. Deformation during the 12 November 1999 Düzce, Turkey, Earthquake, from GPS and InSAR Data[J]. Bulletin of the Seismological Society of America, 2002, 92(1): 161-171.
[17] FENG W P, LI Z H, ELLIOTT J R, et al. The 2011 Mw 6.8 Burma Earthquake: Fault Constraints Provided by Multiple SAR Techniques[J]. Geophysics Journal International, 2013, 195(1): 650-660.
[18] FENG Wanpeng, LI Zhenhong. A Novel Hybrid PSO/Simplex Algorithm for Determining Earthquake Source Parameters Using InSAR Data[J]. Progress in Geophysics, 2010, 25(4): 1189-1196. (冯万鹏, 李振洪. InSAR资料约束下震源参数的PSO混合算法反演策略[J]. 地球物理学进展, 2010, 25(4): 1189-1196.)
[19] JONSSON S, ZEBKER H, SEGALL P, et al. Fault Slip Distribution of the 1999 Mw7.1 Hector Mine, California Earthquake, Estimated from Satellite Radar and GPS Measurements[J]. Bulletin of the Seismological Society of America, 2002, 92(4): 1377-1389.
[20] PARSONS B, WRIGHT T, ROWE P, et al. The 1994 Sefidabeh (Eastern Iran) Earthquakes Revisited: New Evidence from Satellite Radar Interferometry and Carbonate Dating about the Growth of an Active Fold above a Blind Thrust Fault[J]. Geophysics Journal International, 2006, 164(1): 202-217.
Options
Outlines

/

〈 〉