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Seismologic applications of GRACE time-variable gravity measurements |
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| Authors: | Jin Li Jianli Chen Zizhan Zhang |
| Affiliation: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China 2. Center for Space Research, University of Texas at Austin, Austin, TX, USA 3. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan, China |
| Abstract: | The Gravity Recovery and Climate Experiment (GRACE) has been measuring temporal and spatial variations of mass redistribution within the Earth system since 2002. As large earthquakes cause significant mass changes on and under the Earth’s surface, GRACE provides a new means from space to observe mass redistribution due to earthquake deformations. GRACE serves as a good complement to other earthquake measurements because of its extensive spatial coverage and being free from terrestrial restriction. During its over 10 years mission, GRACE has successfully detected seismic gravitational changes of several giant earthquakes, which include the 2004 Sumatra–Andaman earthquake, 2010 Maule (Chile) earthquake, and 2011 Tohoku-Oki (Japan) earthquake. In this review, we describe by examples how to process GRACE time-variable gravity data to retrieve seismic signals, and summarize the results of recent studies that apply GRACE observations to detect co- and post-seismic signals and constrain fault slip models and viscous lithospheric structures. We also discuss major problems and give an outlook in this field of GRACE application. |
| Keywords: | GRACE Time-variable gravity Coseismic Postseismic Deformation Earthquake |
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