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Feasibility study on the potential of satellite altimetry for detecting seismic geoid changes due to the 2004 Sumatra-Andaman earthquake

Abstract

Sea surface height data obtained by satellite altimetry from Jason-1 and TOPEX/Poseidon were analyzed to explore the possibility of a seismic geoid change due to the 2004 Sumatra-Andaman earthquake. This analysis identified a weakly positive geoid change in a region between the trench and outer arc. A subsequent investigation of the characteristics of this coseismic geoid change based on the dislocation theory revealed that a positive peak should indicate the upper edge of the high-slipped area or asperity and that a negative peak is responsible for the lower edge of the earthquake fault. An attempt at modeling the difference in the sea level anomaly failed to explain the observation since a large scatter in the original dataset obstructed its confirmation.

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Correspondence to Yutaka Hayashi.

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Hayashi, Y., Hirata, K., Kuragano, T. et al. Feasibility study on the potential of satellite altimetry for detecting seismic geoid changes due to the 2004 Sumatra-Andaman earthquake. Earth Planet Sp 59, 1149–1153 (2007). https://doi.org/10.1186/BF03352062

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Key words

  • Asperity
  • coseismic geoid change
  • Jason-1
  • satellite altimetry
  • sea surface height
  • TOPEX/Poseidon
  • 2004 Sumatra-Andaman earthquake