| Institute of Geomechanics, Chinese Academy of Geological Sciences | Host |
| Citation: |
YAO Xin, ZHANG Yong-shuang, YANG Nong, XIONG Tan-yu. D-INSAR OBSERVATION OF EARTH SURFACE DEFORMATION IN THE MS7.1 YUSHU EARTHQUAKE[J]. Journal of Geomechanics, 2010, 16(2): 129-136.
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D-INSAR OBSERVATION OF EARTH SURFACE DEFORMATION IN THE MS7.1 YUSHU EARTHQUAKE
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Abstract
A "Two Paths+DEM" interferometric process was made for the PALSAR SAR data before (Jan. 15, 2010) and after (Apr. 17, 2010) the Yushu MS7.1 Earthquake, which yielded a high-quality co-seismic InSAR strip image and absolutely surface deformation. Based on the deformation scale, deformation magnitude and deformation gradient, in combination with tectonic setting of the area, the following conclusions can be drawn: (1) Yushu earthquake triggered a 70-km NWW-extending mutation belt, with a southern section Showing greater dislocation and deformation gradient, which will induce surface raptures, and No. 4 segment in northwestern part showing weaker deformation and no ruptures on the ground surface. (2) The SAR motive directions from both sides of mutation belt indicate a dominant sinistral movement of seisgenic faults. (3) The macro-epicenter is located on the mutation belt 16km northwest of Yushu County. The present InSAR interpretations match well with the seismic mechanics, field investigations and geomorphology features from the China Earthquake Networks Center, and can provide better support for rapid evaluation to earthquake hazard and accurately ing surface track of seismogenic fault.
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Keywords:
- Yushu Earthquake /
- InSAR /
- Surface Rupture /
- Coseismal seismic Deformation
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References
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YAO Xin, ZHANG Yong-shuang, YANG Nong, XIONG Tan-yu. D-INSAR OBSERVATION OF EARTH SURFACE DEFORMATION IN THE MS7.1 YUSHU EARTHQUAKE[J]. Journal of Geomechanics, 2010, 16(2): 129-136.
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Figure 1.
A map showing the distribution map of Gznai-Yushu active fault zone (after Zhou Rongjun, 1997) and InSAR covering area
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Figure 2.
Wrapped InSAR strip image of Yushu earthquake co-seismic deformation
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Figure 3.
InSAR LOS Deformation of Yushu earthquake
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Figure 4.
Surface ruptures based on InSAR (Background is the 90m SRTM hillshade map)