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Application of Mwp to the Great December 26, 2004 Sumatra Earthquake

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Abstract

A great earthquake of Mw9.0 (Harvard) occurred off of northwestern Sumatra on December 26, 2004 (UTC), causing an unprecedented tsunami disaster. An earthquake of Mw8.6 (Harvard) then occurred on March 28, 2005 (UTC), about 160 km to the southeast of the December event’s epicenter. The Matsushiro Seismological Observatory of Japan Meteorological Agency determined magnitudes of M8.8 and M8.7 respectively for these events using the Global Seismic Network’s (GSN) Live Internet Seismic Server (LISS) data. The West Coast/Alaska Tsunami Warning Center (WC/ATWC), and the Pacific Tsunami Warning Center (PTWC) both use Mwp to rapidly evaluate moment magnitude. The WC/ATWC calculated a mean Mwp of 8.0 for the multiple event on Decmber 26, 2004. Using data from the IRIS station MAJO, we determined an Mwp of 8.5 by using a distance-dependent apparent P-wave velocity (α = 0.16Δ + 7.9 km/sec.) instead of a constant apparent P wave velocity (α = 7.9 km/sec), for α in the original equation for Mwp. The corrected Mwp value of 8.5 is much closer to the total moment magnitude of the multiple ruptures of the complex December 26 main-shock, and is useful as a first magnitude estimation to evaluate possible tsunami generation.

References

  1. Ammon, J. C., C. Ji, H.-K. Thio, D. Robinson, S. Ni, V. Hjorleifsdottir, H. Kanamori, T. Lay, S. Das, D. Helmberger, G. Ichinose, J. Polet, and D. Wald, Rupture process of the 2004 Sumatra-Andaman Earthquake, Science, 303, 1133–1139, 2005.

  2. Dziewonski, A., M., T.-A. Chou, and J. H. Woodhouse, Determination of earthquake source parameters from waveform data for studies of global and regional seismicity, J. Geophys. Res., 86, 2825–2852, 1981.

  3. Furudate, T., Utilization of LISS data, Tech. Rep. M.S.O.JMA, 19, 3–6, 2002.

  4. Furudate, T., Utilization of LISS data and epicenter determination, Tech. Rep. M.S.O., JMA, 20, 17–22, 2003.

  5. Goldstein, P., SAC (Seismic Analysis Code), http://www.llnl.gov/sac/, 2005.

  6. Ishii, M., P. M. Shearer, H. Houston, and J. E. Vidale, Extent, duration and speed of the 2004 Sumatra-Andaman earthquake imaged by the Hi-net array, Nature, 435, 933–936, 2005.

  7. Kanamori, H., The energy release in great earthquakes, J. Geophys. Res., 82, 2981–2987, 1977.

  8. Lay, T., H. Kanamori, C. J. Ammon, M. Nettles, S. N. Ward, R. C. Aster, S. L. Beck, S. L. Bilek, M. R. Brudzinski, R. Butler, H. R. DeShon, G. Ekstrom, K. Satake, and S. Sipkin, The great Sumatra-Andaman earthquake of 26 December 2004, Science, 308, 1127–1133, 2005.

  9. Ni, S., H. Kanamori, and D. Helmberger, Energy radiation from the Sumatra earthquake, Nature, 582, 2005.

  10. Ogahara, T., T. Furudate, and M. Okada, Preliminary empirical formula to estimate moment magnitude of tele-seismic event by using LISS data, Tech. Rep. M.S.O., JMA, 21, 75–82, 2004.

  11. Park, J., T. A. Song, J. Tromp, E. Okal, S. Stein, G. Roult, E. Clevede, G. Laske, H. Kanamori, P. Davis, J. Berger, C. Braitenberg, M. V. Camp, X. Lei, H. Sun, H. Xu, and S. Rosat, Earth’s free oscillations excited by the 26 December 2004 Sumatra-Andaman earthquake, Science, 308, 1139–1144, 2005.

  12. Stein, S. and E. Okal, Ultra-long period seismic moment of the great December 26, 2004 Sumatra earthquake and implication for the slip process, http://www.earth.northwestern.edu/people/seth/research/sumatra.html, 2005.

  13. Tsuboi, S., K. Abe, K. Takano, and Y. Yamanaka, Rapid determination of Mw from broadband P waveforms, Bull. Seism. Soc. Am., 83, 606–613, 1995.

  14. Tsuboi, S., P. M. Whitmore, and T. J. Sokolowski, Application of Mwp to deep and teleseismic earthquakes, Bull. Seism. Sic. Am., 89, 1345–1351, 1999.

  15. Whitmore, P. M., S. Tsuboi, B. Hirshorn, and T. J. Sokolowski, Magnitude-dependent correction for Mwp, Science of Tsunami Hazards, 20,4, 187–192, 2002.

  16. Yagi, Y., Preliminary results of rupture process for December 26, 2004 off coast of northern Sumatra giant earthquake (M9.0) (ver. 1), http://iisee.kenken.go.jp/staff/yagi/eq/Sumatra2004/Sumatra2004.html, 2005a.

  17. Yagi, Y., Preliminary results of rupture process for March 28,2004 off coast of northern Sumatra giant earthquake (M8.7), http://iisee.kenken.go.jp/staff/yagi/eq/Sumatra2005/Sumatra20050328-j.html, 2005b (in Japanese).

  18. Yamanaka, Y., EIC Seismological note No.161+: Off the west coast of northern Sumatra earthquake (M9.0), http://www.eri.u-tokyo.ac.jp/topics/SUMATRA2004/index.html, 2005a.

  19. Yamanaka, Y., EIC Seismological note No.164:Northern Sumatra earthquake (M8.7), http://www.eri.u-tokyo.ac.jp/topics/indonesia200503/index-e.html, 2005b.

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Correspondence to Kenji Kanjo.

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Kanjo, K., Furudate, T. & Tsuboi, S. Application of Mwp to the Great December 26, 2004 Sumatra Earthquake. Earth Planet Sp 58, 121–126 (2006) doi:10.1186/BF03353368

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Key words

  • Mw9.0 Sumatra earthquake of 2004
  • tsunami disaster
  • tsunami information
  • Mwp
  • distance-dependent correction