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Post-2004 mega-earthquake temporal velocity variation at Andaman Islands from GPS measurements

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  • S. Som
  • Ashim Saha
  • Vijay Shivgotra

Abstract

Post-mega-earthquake velocity adjustment at Andaman region was found to vary with time. Coordinate repeatability for 5-year span shows changeover from post-seismic to inter-seismic period in between 900 and 1,000 days from the mega-earthquake. Excluding Havlock Island, all sites move from south to north and from east to west. Velocity vectors gradually rotated from the nearly perpendicular orientation after the mega-earthquake to parallel orientation with the subduction interface in later phase. Velocities in India 2005 reference frame indicate the presence of a structural discontinuity between Bedonabad and Chidiatapu at south Andaman, between Padmanavapuram and Kaushalyanagar at middle Andaman and between Aerial Bay and Radhanagar at north Andaman. Copyright Springer Science+Business Media Dordrecht 2014

Suggested Citation

  • S. Som & Ashim Saha & Vijay Shivgotra, 2014. "Post-2004 mega-earthquake temporal velocity variation at Andaman Islands from GPS measurements," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 72(2), pages 1051-1062, June.
    • Handle: RePEc:spr:nathaz:v:72:y:2014:i:2:p:1051-1062
    DOI: 10.1007/s11069-014-1051-5
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    References listed on IDEAS

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    1. O. Mishra & D. Zhao & Chandan Ghosh & Z. Wang & O. Singh & Biman Ghosh & K. Mukherjee & D. Saha & G. Chakrabortty & S. Gaonkar, 2011. "Role of crustal heterogeneity beneath Andaman–Nicobar Islands and its implications for coastal hazard," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 57(1), pages 51-64, April.
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      Keywords

      Andaman; GPS; Velocity;
      All these keywords.

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