Global co-seismic displacements caused by the 2004 Sumatra-Andaman earthquake (Mw 9.1)

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概要

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• This paper presents and discusses the global co-seismic displacements caused by the 2004 Sumatra-Andaman earthquake, using quasi-static dislocation theory for a spherically symmetric earth model (Sun <I>et al</I>., 1996). Theoretical calculations are performed with a heterogeneous slip distribution fault model based on Ammon <I>et al</I>. (2005). Results show that the co-seismic horizontal displacements are large to the north-east and southwest of the fault plane. Even as far as 6000 km from the epicenter, more than 1 millimeter co-seismic horizontal displacements raised from the earthquake. This paper has three contributions: to validate the fault model (Ammon <I>et al</I>., 2005) by geodetic data; to interpret the displacements observed by GPS; and to provide a reference for other researchers or for other geodetic applications. Overall, the modelled and observed displacements basically agree with each other in both the near field and far field. The calculated displacements are a generally smaller than the observed ones, since considerable moment is released by slow-slips and/or aftershocks which has not been included in the fault model.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Sun Wenke

  Earthquake Research Institute University Of Tokyo

• FU Guangyu

  Earthquake Research Institute, University of Tokyo

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• Global co-seismic displacements caused by the 2004 Sumatra-Andaman earthquake (Mw 9.1)

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