Co-seismic Earth's rotation caused by the 2012 Sumatra earthquake 被引量：1

Co-seismic Earth's rotation caused by the 2012 Sumatra earthquake

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摘要 Earthquakes heavily deform the crust in the vicinity of the fault, which leads to mass redistribution in the earth interior. Then it will produce the change of the Earth＇s rotation （ polar motion and length of day） due to the change of Earth inertial moment. This paper adopts the elastic dislocation to compute the co-seismic polar motion and variation in length of day （LOD） caused by the 2011 Sumatra earthquake. The Earth＇s rota- tional axis shifted about 1 mas and this earthquake decreased the length of day of 1 p,s, indicating the tendency of earthquakes make the Earth rounder and to pull the mass toward the centre of the Earth. The result of varia- tion in length of day is one order of magnitude smaller than the observed results that are available. We also compared the results of three fault models and find the co-seismic change is depended on the fault model. Earthquakes heavily deform the crust in the vicinity of the fault, which leads to mass redistribution in the earth interior. Then it will produce the change of the Earth＇s rotation （ polar motion and length of day） due to the change of Earth inertial moment. This paper adopts the elastic dislocation to compute the co-seismic polar motion and variation in length of day （LOD） caused by the 2011 Sumatra earthquake. The Earth＇s rota- tional axis shifted about 1 mas and this earthquake decreased the length of day of 1 p,s, indicating the tendency of earthquakes make the Earth rounder and to pull the mass toward the centre of the Earth. The result of varia- tion in length of day is one order of magnitude smaller than the observed results that are available. We also compared the results of three fault models and find the co-seismic change is depended on the fault model.

作者 Xu Changyi Sun Wenke

机构地区 Key Laboratory of Computational Geodynamics

出处《Geodesy and Geodynamics》 2012年第4期28-31,共4页 大地测量与地球动力学（英文版）

基金 supported by the National Natural Science Foundation of China(41174063)

关键词 EARTHQUAKE Earth rotation polar motion variation in LOD earthquake Earth rotation polar motion variation in LOD

分类号 P315 [天文地球—地震学]

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