Characteristics of subsurface density variations before the 4.20 Lushan M S7.0 earthquake in the Longmenshan area: inversion results

• DOI: 10.1007/s11589-015-0109-0
• Publication Date: 2015-02-06T07:46:14Z
• Authors: Songbai Xuan; Chongyang Shen; Hui Li; Hongtao Hao
• Keywords: Geophysics; Geology; Geotechnical Engineering and Engineering Geology; 01 natural sciences; 0105 earth and related environmental sciences

The 4.20 Lushan M S7.0 earthquake occurred on the southwest segment of Longmenshan fault 20 April 2013. Some meaningful information preparation and occurrence this was found based dynamic variation gravity (DVG). To examine great progress earthquake, we obtained density (DENV) derived from DVG using compact inversion method in article. results reveal three main findings: (1) DENV crust Jinshajiang area changed positive 2010–2011 to negative 2011–2012. (2) Xianshuihe decreased continuously 2010 2012. (3) uppermost mantle South China increased We propose that flow/expansion middle-lower beneath Bayan Har block Moho subsidence margin Chuan-Dian may have been major causes earthquake.