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| Effects of sedimentary layer on earthquake source modeling from geodetic inversion |
| Weiwen Chen1, Sidao Ni2, Shengji Wei3, Zhenjie Wang1, Jun Xie1 |
1 Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei 230026, China
2 CAS Key Laboratory of Geodynamical Geodesy, Institute of Geodesy and Geophysics, Wuhan 430077, China
3 Seismological Laboratory, California Institute of Technology, Pasadena CA 91125, USA |
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Abstract Ground deformation as observed with GPS or InSAR has been broadly inverted in constraining source parameter of earthquakes. However, for earthquakes occurring beneath sedimentary basins, the very slow sub-surface shear velocity (vS, down to 200 m/s) may cause substantial bias to earthquake source inversion if simple crustal models are used. For Bohai basin, Sichuan basin and rock-sites, we test effects of sub-surface shear velocity structure on ground deformation, and find that up to a factor of 2 overestimate of seismic moment could be generated by the basin structures. Therefore, the very slow sub-surface velocity has to be taken into account before accurate source inversion can be applied.
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Received: 28 November 2010
Published: 10 April 2011
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| Fund:National Natural Science Foundation of China (Nos. 40821160549 and 41074032), Chinese Academy of Sciences fund (No. KZCX2-YW-116-1) and Joint Seismological Science Foundation of China (200808078) |
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Corresponding Authors:
Sidao Ni
E-mail: sdni@whigg.ac.cn
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