Co-seismic and Post-seismic Gravity Changes of the Japan Mw9.0 Earthquake from GRACE RL05 Data

doi:10.13474/j.cnki.11-2246.2018.0007

Abstract

Abstract:

Based on the RL05 earth gravity field model released by GFZ,considering the influence of the terrestrial water reserves in the global land data assimilation system,the co-seismic and post-seismic gravity changes caused by the 2011 Japan Mw9.0 earthquake is successfully extracted by using the method of stacking and 300 km fan filter.The gravity annual variation rate of the two characteristic points around the epicenter is calculated as well by using the method of least squares fitting in 85 months before and after the earthquake.The results show that the gravity change caused by the soil moisture content and accum snow is -0.34~0.09 μgal; the co-seismic gravity changes from the GRACE RL05 data is -5.3~4.2 μgal,which is consistent well with the result based on the PSGRN/PSCMP model in spatial distribution and order of magnitude; the gravity increasing trend is showed in the area around the epicenter in 5 years after the earthquake,the maximum increase in gravity of the Sea of Japan the upper plate locates and the Pacific Ocean the subduction area locates is 2.6 μgal and 4.5 μgal,respectively,the gravity of the subduction area increases greater,indicating that the viscosity of the subduction area is relatively lower than that of the up-lift zone.

Key words: GRACE, gravity change, Japan Mw9.0 earthquake

CLC Number:

P228

YIN Peng, ZHANG Yongzhi, JIAO Jiashuang, NAN Kangkang, WANG Huiling. Co-seismic and Post-seismic Gravity Changes of the Japan Mw9.0 Earthquake from GRACE RL05 Data[J]. 测绘通报, 2018, 0(1): 38-43.

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