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Volume 58 Supplement 2

Special Issue: The 2004 Great Sumatra Earthquake and Tsunami

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

Abstract

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 et al., 1996). Theoretical calculations are performed with a heterogeneous slip distribution fault model based on Ammon et al. (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 et al., 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.

References

  • Ammon, C. J., J. Chen, H. Thio et al., Rupture process of the 2004 Sumatra-Andaman earthquake, Science, 308, 1133–1139, 2005.

    Article  Google Scholar 

  • Banerjee, P., F. F. Pollitz, and R. Burgmann, The size and duration of the Sumatra-Andaman earthquake from far-field static offsets, Science, 308, 1769–1772, 2005.

    Article  Google Scholar 

  • Fu, G. and W. Sun, Effects of spatial distribution of fault slip on calculating co-seismic displacement: case studies of the Chi-Chi earthquake (Mw7.6) and the Kunlun earthquake (Mw 7.8), Geophys. Res. Lett., 31, L21601, doi:10.1029/2004GL020841, 2004.

    Article  Google Scholar 

  • Khan, S. A. and O. Gudmundsson, GPS analyses of the Sumatra-Andaman earthquake, EOS Transaction American Geophysical Union, 86(9), 2005.

    Google Scholar 

  • Okada, Y, Surface deformation due to shear and tensile faults in a half-space, Bull. Seismol. Soc. Am., 75(4), 1135–1154, 1985.

    Google Scholar 

  • Okubo, M., Y. Asai, H. Ishii et al., Thousand kilometres breaking of the 2004 Sumatra earthquake proved by dynamic strain analysis, (http://www.tries.gr.jp/topix/TRIES-report101.pdf), 2005.

    Google Scholar 

  • Okubo, S., Gravity and potential changes due to shear and tensile faults in half-space, J. Geophys. Res., 97(B5), 7137–7144, 1992.

    Article  Google Scholar 

  • Sun, W. and S. Okubo, Effects of the earth’s spherical curvature and radial heterogeneity in dislocation studies for a point dislocation, Geophys. Res. Lett., 29(12), 1605, doi:10.1029/2001GL014497, 2002.

    Article  Google Scholar 

  • Sun, W., S. Okubo, and P. Vanicek, Global displacement caused by dislocations in a realistic earth model, J. Geophys. Res., 101, 8561–8577, 1996.

    Article  Google Scholar 

  • Vigny, C., W. J. F Simons, S. Abu et al., Insight into the 2004 Sumatra-Andaman earthquake from GPS measurements in Southeast Asia, Nature, 436, 201–206, 2005.

    Article  Google Scholar 

  • Yamanaka, Y, 04/12/26 Off west coast of northern Sumatra, Earthquake information centre seismological note No. 161, Earthquake Res. Instit., Univ. Tokyo. (http://www.eri.u-tokyo.ac.jp/sanchu/Seis.Note/2004/EIC161e.html), 2004.

    Google Scholar 

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Correspondence to Guangyu Fu.

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Fu, G., Sun, W. Global co-seismic displacements caused by the 2004 Sumatra-Andaman earthquake (Mw 9.1). Earth Planet Sp 58, 149–152 (2006). https://doi.org/10.1186/BF03353371

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  • DOI: https://doi.org/10.1186/BF03353371

Key words

  • The 2004 Sumatra-Andaman earthquake
  • co-seismic displacement
  • dislocation theory