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    Which Fault Segments Ruptured in the 2008 Wenchuan Earthquake and Which Did Not? New Evidence from Near-Fault 3D Surface Displacements Derived from SAR Image Offsets

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    Type
    Article
    Authors
    Feng, Guangcai
    Jonsson, Sigurjon cc
    Klinger, Yann
    KAUST Department
    Crustal Deformation and InSAR Group
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2017-03-14
    Online Publication Date
    2017-03-14
    Print Publication Date
    2017-06
    Permanent link to this record
    http://hdl.handle.net/10754/623046
    
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    Abstract
    The 2008 Mw 7.9 Wenchuan earthquake ruptured a complex thrust-faulting system at the eastern edge of the Tibetan plateau and west of Sichuan basin. Though the earthquake has been extensively studied, several details about the earthquake, such as which fault segments were activated in the earthquake, are still not clear. This is in part due to difficult field access to the fault zone and in part due to limited near-fault observations in Interferometric Synthetic Aperture Radar (InSAR) observations because of decorrelation. In this study, we address this problem by estimating SAR image offsets that provide near-fault ground displacement information and exhibit clear displacement discontinuities across activated fault segments. We begin by reanalyzing the coseismic InSAR observations of the earthquake and then mostly eliminate the strong ionospheric signals that were plaguing previous studies by using additional postevent images. We also estimate the SAR image offsets and use their results to retrieve the full 3D coseismic surface displacement field. The coseismic deformation from the InSAR and image-offset measurements are compared with both Global Positioning System and field observations. The results indicate that our observations provide significantly better information than previous InSAR studies that were affected by ionospheric disturbances. We use the results to present details of the surface-faulting offsets along the Beichuan fault from the southwest to the northeast and find that there is an obvious right-lateral strike-slip component (as well as thrust faulting) along the southern Beichuan fault (in Yingxiu County), which was strongly underestimated in earlier studies. Based on the results, we provide new evidence to show that the Qingchuan fault was not ruptured in the 2008 Wenchuan earthquake, a topic debated in field observation studies, but show instead that surface faulting occurred on a northward extension of the Beichuan fault during or immediately following the mainshock.
    Citation
    Feng G, Jónsson S, Klinger Y (2017) Which Fault Segments Ruptured in the 2008 Wenchuan Earthquake and Which Did Not? New Evidence from Near-Fault 3D Surface Displacements Derived from SAR Image Offsets. Bulletin of the Seismological Society of America. Available: http://dx.doi.org/10.1785/0120160126.
    Sponsors
    The authors would like to thank Associate Editor Bill Hammond and two anonymous reviewers for critical comments and suggestions. The Advanced Land Observing Satellite (ALOS) data were provided by the Japan Aerospace Exploration Agency (JAXA) through projects P1229002 and P1390002, and the Envisat data were obtained through the GEO Geohazards Supersites project (C1P.14838 and C1P.16734). Figures were prepared using the Generic Mapping Tools (GMT) software (Wessel and Smith, 1998). The research was supported by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Seismological Society of America (SSA)
    Journal
    Bulletin of the Seismological Society of America
    DOI
    10.1785/0120160126
    Additional Links
    http://www.bssaonline.org/content/early/2017/03/09/0120160126
    ae974a485f413a2113503eed53cd6c53
    10.1785/0120160126
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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