Coseismic and postseismic deformation of the 2008 Wenchuan Earthquake from InSAR

被引:13
作者
Wen Yang-Mao [1 ,2 ,3 ]
Xu Cai-Jun [1 ]
Li Zhen-Hong [2 ]
Liu Yang [1 ]
Feng Wan-Peng [3 ,4 ]
Shan Xin-Jian [5 ]
机构
[1] Wuhan Univ, Sch Geodesy & Geomat, Wuhan 430079, Peoples R China
[2] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[3] Univ Glasgow, Sch Geog & Earth Sci, Glasgow G12 8QQ, Lanark, Scotland
[4] China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
[5] China Earthquake Adm, Inst Geol, Beijing 100029, Peoples R China
来源
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION | 2014年 / 57卷 / 06期
关键词
Wenchuan earthquake; InSAR; Coseismic deformation; Postseismic deformation; Joint inversion; Viscosity; FAULT SLIP; TIBET EARTHQUAKE; SATELLITE RADAR; 1997; MANYI; GPS; INTERFEROMETRY; PLATEAU; RUPTURE; CHINA; RATES;
D O I
10.6038/cjg20140613
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
On 12 May 2008, an M(w)7. 9 earthquake occurred on the Longmenshan fault system at the eastern margin of the Qinghai-Tibet Plateau near Wenchuan City. Here we obtained the ionospheric perturbations in Japanese ALOS/PALSAR images covering the epicenter of Wenchuan earthquake from the corresponding azimuth offsets, and determined highly precise and continuous InSAR surface displacements using those that are not strongly affected by ionospheric perturbations. Combing with the GPS coseismic deformation, a joint model considering both coseismic and postseismic phases is constructed to study the coseismic slip distribution of the Wenchuan earthquake and the viscous structure of the Longmenshan region. The best-fitting slip model suggests that the earthquake is an event with very complex fault rupture. The slips of Hongkou, Yuejiashan, Beichuan, and Hanwang segments are dominated by the thrust movement and the Qingchuan segment experiences a dominant right-lateral strike slip. The major slip occurred mainly at the depth of less than 10 km, with a maximum slip, of 10. 7 m on the northeastern Hongkou segment. The determined geodetic moment is approximately 9. 28 X 10(20) N . m (M(w)7. 91), which is consistent with the results of seismology. The mid to lower crustal viscosity derived from the joint model in a Maxwell half-space is 2X10(18) Pa . s, which places a strong low bound on viscosity in the Longmenshan region. Postseismic displacements time series covering a longer time span might have the potential to improve this constraint.
引用
收藏
页码:1814 / 1824
页数:11
相关论文
共 34 条
  • [1] Topography associated with crustal flow in continental collisions, with application to Tibet
    Bendick, R.
    McKenzie, D.
    Etienne, J.
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2008, 175 (01) : 375 - 385
  • [2] Phase unwrapping for large SAR interferograms: Statistical segmentation and generalized network models
    Chen, CW
    Zebker, HA
    [J]. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2002, 40 (08): : 1709 - 1719
  • [3] Clark MK, 2000, GEOLOGY, V28, P703, DOI 10.1130/0091-7613(2000)28<703:TOBTEM>2.0.CO
  • [4] 2
  • [5] The role of crustal strength variations in shaping orogenic plateaus, with application to Tibet
    Cook, Kristen L.
    Royden, Leigh H.
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2008, 113 (B8)
  • [6] The CATDAT damaging earthquakes database
    Daniell, J. E.
    Khazai, B.
    Wenzel, F.
    Vervaeck, A.
    [J]. NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, 2011, 11 (08) : 2235 - 2251
  • [7] The shuttle radar topography mission
    Farr, Tom G.
    Rosen, Paul A.
    Caro, Edward
    Crippen, Robert
    Duren, Riley
    Hensley, Scott
    Kobrick, Michael
    Paller, Mimi
    Rodriguez, Ernesto
    Roth, Ladislav
    Seal, David
    Shaffer, Scott
    Shimada, Joanne
    Umland, Jeffrey
    Werner, Marian
    Oskin, Michael
    Burbank, Douglas
    Alsdorf, Douglas
    [J]. REVIEWS OF GEOPHYSICS, 2007, 45 (02)
  • [8] Coseismic fault slip of the 2008 Mw 7.9 Wenchuan earthquake estimated from InSAR and GPS measurements
    Feng, GuangCai
    Hetland, Eric A.
    Ding, XiaoLi
    Li, ZhiWei
    Zhang, Lei
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2010, 37
  • [9] Kinematic fault slip evolution source models of the 2008 M7.9 Wenchuan earthquake in China from SAR interferometry, GPS and teleseismic analysis and implications for Longmen Shan tectonics
    Fielding, Eric J.
    Sladen, Anthony
    Li, Zhenhong
    Avouac, Jean-Philippe
    Buergmann, Roland
    Ryder, Isabelle
    [J]. GEOPHYSICAL JOURNAL INTERNATIONAL, 2013, 194 (02) : 1138 - 1166
  • [10] Stress-dependent power-law flow in the upper mantle following the 2002 Denali, Alaska, earthquake
    Freed, Andrew M.
    Burgmann, Roland
    Calais, Eric
    Freymueller, Jeff
    [J]. EARTH AND PLANETARY SCIENCE LETTERS, 2006, 252 (3-4) : 481 - 489