Preliminary Results of Satellite Radar Differential Interferometry for the Co-seismic Deformation of the 12 May 2008 Ms8.0 Wenchuan Earthquake

Abstract Satellite differential SAR interferometry has been widely accepted as a powerful tool to map co-, post- and inter-seismic deformation since its successful application to the 1992 Landers Earthquake. As soon as the Ms8.0 Wenchuan Earthquake occurred on 12 May 2008 in the Sichuan Province of southwestern China, the Japan Aerospace Exploration Agency tasked its Advanced Land Observing Satellite (ALOS) to respond to the disaster by collecting images. This paper presents the preliminary DInSAR results of co-seismic deformation of the quake observed from two satellite paths of the onboard ALOS/PALSAR sensor with post-seismic images acquired on 19 and 24 May. Results from pixel offset analysis and difference of coherence will also be discussed. The radar mapping is still ongoing because the ruptured seismic fault is more than 300km in length. Each swath of the PALSAR fine beam covers only about a 75km segment of the fault, and it takes 46 days for ALOS to revisit the same site.

[1]  Linear Combinations for Differential Radar Interferometry , 2009 .

[2]  Didier Massonnet,et al.  Detection of postseismic fault-zone collapse following the Landers earthquake , 1996, Nature.

[3]  Chris Rizos,et al.  GPS and GIS Assisted Radar Interferometry , 2004 .

[4]  K. Feigl,et al.  Radar interferometric mapping of deformation in the year after the Landers earthquake , 1994, Nature.

[5]  Paul A. Rosen,et al.  3-D surface deformation of the 2000 Usu Eruption measured by matching of SAR images , 2001 .

[6]  Paul Segall,et al.  Post-earthquake ground movements correlated to pore-pressure transients , 2003, Nature.

[7]  J. M. STAGG.  The International Union of Geodesy and Geophysics , 1947, Nature.

[8]  M. Shimada,et al.  Crustal Deformation Caused by Earthquake Detected by InSAR Technique Using ALOS/PALSAR Data , 2007 .

[9]  C. Rizos,et al.  Assessment of digital elevation models using RTK GPS , 2004 .

[10]  Caijun Xu,et al.  3-D coseismic displacement field of the 2005 Kashmir earthquake inferred from satellite radar imagery , 2007 .

[11]  Véronique Prinet,et al.  InSAR coherence estimation , 2004, IGARSS 2004. 2004 IEEE International Geoscience and Remote Sensing Symposium.

[12]  T. Farr,et al.  Shuttle radar topography mission produces a wealth of data , 2000 .

[13]  C. Rizos,et al.  Tropospheric corrections to SAR interferometry from GPS observations , 2004 .

[14]  Chris Rizos,et al.  Mine subsidence monitoring using multi-source satellite SAR images , 2007 .

[15]  Caijun Xu,et al.  Coseismic deformation and slip distribution of the 1997 Mw7.5 Manyi, Tibet, earthquake from InSAR measurements , 2007 .

[16]  K. Feigl,et al.  The displacement field of the Landers earthquake mapped by radar interferometry , 1993, Nature.

[17]  Caijun Xu,et al.  InSAR tropospheric delay mitigation by GPS observations: A case study in Tokyo area , 2006 .

[18]  Yuri Fialko,et al.  Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system , 2006, Nature.

[19]  Masashi Matsuoka.  Use of ALOS/PALSAR imagery for monitoring areas damaged due to recent natural disasters , 2006, SPIE Asia-Pacific Remote Sensing.

[20]  H. Zebker,et al.  Fault Slip Distribution of the 1999 Mw 7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements , 2002 .

[21]  D. Sandwell,et al.  Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit , 2005, Nature.