Theoretical Simulation of Co-Seismic and Post-Seismic Deformations and Gravity Changes of Lushan Earthquake
Deng Mingli
Sun Heping
Xu Jianqiao
Zhu Yiqing
Abstract：This paper aims at studying the seismogenic process and long-term tectonic process of the source area and explain the post-seismic deformation and gravity data in Lushan earthquake.Based on the layered half-space model,we calculate the co-and post-seismic surface deformations and gravity changes and their time series gained by the GPS and gravity stations ,consid-ering regional rheological coefficients,and using the numerical simulation method.It is found that the surface co-seismic deformation shows seismogenic fault is of obvious thrusting characteristics The range of influence of viscoelastic relaxation is significantly enlarged than that of the co-seismic,but changes gradually reduce with the increase of viscousity coefficients.The time-variable curves of the stations show that post-seismic deformation and gravity changes are significant in 50 years after the earthquake,become gentle after 100 years and tend to be stable.The post-seismic observations of the GPS stations are convinced to consider the effect of viscoelastic relaxation except for the MEIG and the MYAN.
Keywords：Lushan earthquakeground deformationgravity changeviscoelastic relaxationgeophysics
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1373-1382 )