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  • Article
  • Open Access

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

  • 14Email author,
  • 14,
  • 24,
  • 34,
  • 14,
  • 44 and
  • 44
Earth, Planets and Space200759:BF03352062

  • Received: 22 July 2005
  • Accepted: 2 October 2007
  • Published:


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.

Key words

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