Coseismic displacement estimate of the 2013 Ms7.0 Lushan, China earthquake based on the simulation of near-fault displacement field

作者：Hong Zhou

摘要：Usually, GPS observation provides direct evidence to estimate coseismic displacement. However, GPS stations are scattered, sparse and cannot provide a detailed distribution of coseismic displacement. Strong ground motion records share the same disadvantages as GPS in estimating coseismic displacement. Estimations from In SAR data can provide displacement distributions; however, the resolution of such methods is limited by the analysis techniques. The paper focuses on estimating the coseismic displacement of the M_S7.0 Lushan earthquake on April 20, 2013 using a simulation of the wave field based on the elastic wave equation instead of a quasi-static equation. First, the media and source models were constructed by comparing the simulated velocity and the record velocity of the ground motion. Then simulated static displacements were compared with GPS records. Their agreement validates our results. Careful analysis of the distribution of simulated coseismic displacements near the fault reveals more details of the ground motion. For example, an uplift appears on the hanging wall of the fault,rotation is associated with the horizontal displacement, the fault strike and earthquake epicenter provide the main control on motion near the faults, and the motion on the hanging wall is stronger than that on the footwall. These results reveal additional characteristics of the ground motion of the Lushan earthquake.

發文機構：Institute of Geophysics

關鍵詞：位移估計地震震中近斷層模擬蘆山位移場強地面運動GPS觀測Lushan earthquake. Coseismic displacementSimulation of the wave field . Spectral element method

分類號： P316.2[天文地球—地震學][天文地球—固體地球物理學][天文地球—地球物理學]TU196.1[建筑科學—建筑理論]