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The precursory earthquake swarm in Japan: hypothesis test

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Abstract

A formal performance test of the hypothesis that swarms are long-term precursors to major shallow earthquakes is in progress in the region of Pacific-plate subduction in Japan. The likelihood of the major earthquakes (JMA magnitude ≥6.8) that occurred in the region during the test period (1983–1998) was 5.04 times higher under the swarm hypothesis than under the stationary Poisson model; this result is inconclusive in terms of the proposed acceptance level of 20. The earthquakes were the Hokkaido-Toho-Oki earthquake (M8.1) of 4 October 1994, and the Sanriku-Haruka-Oki earthquake (M7.5) of 28 December 1994. The significance of the performance has been evaluated by a Monte Carlo study of the results since mid-1991. This shows that the Poisson model can be rejected at the 1% level, and that the results are consistent with the swarm hypothesis. The test is continuing.

References

  1. Aki, K., A probabilistic synthesis of precursory phenomena, in Earthquake Prediction, edited by D. W. Simpson and P. G. Richards, pp. 566–574, American Geophysical Union, Washington, D.C., 1981.

  2. Evison, F. F., Multiple earthquake events at moderate-to-large magnitudes in Japan, J. Phys. Earth, 29, 327–339, 1981.

  3. Evison, F. F., Earthquake forecasting and countermeasures planning, Earthquake Prediction Research, 1, 115–124, 1982a.

  4. Evison, F. F., Generalised precursory swarm hypothesis, J. Phys. Earth, 30, 155–170, 1982b.

  5. Evison, F. F. and D. A. Rhoades, The precursory earthquake swarm in New Zealand: hypothesis tests, New Zealand J. Geol. Geophys., 36, 51–60, 1993.

  6. Evison, F. F. and D. A. Rhoades, The precursory earthquake swarm in New Zealand: hypothesis tests II, New Zealand J. Geol. Geophys., 40, 537–547, 1997.

  7. Evison, F. F. and D. A. Rhoades, Long-term seismogenic process for major earthquakes in subduction zones, Phys. Earth Planet. Inter., 108, 185–199, 1998.

  8. Evison, F. F. and D. A. Rhoades, The precursory earthquake swarm and the inferred precursory quarm, New Zealand J. Geol. Geophys., 42, 229–236, 1999.

  9. IUGG, Code of practice for earthquake prediction, Int. Union Geod. Geophys. Chronicle, 165, 27–28, 1984.

  10. Kasahara, K. and T. Kato, Aseismic faulting following the 1973 Nemuro-Oki earthquake, Hokkaido, Japan (a retrospective study), Pure Appl. Geophys., 119, 392–403, 1980/81.

  11. Kawasaki, I., Y. Asai, Y. Tamura, T. Sagiya, N. Mikami, Y. Okada, M. Sakata, and M. Kasahara, The 1992 Sanriku-Oki, Japan, ultra-slow earthquake, J. Phys. Earth, 43, 105–116, 1995.

  12. Mogi, K., Earthquake prediction research in Japan, J. Phys. Earth, 43, 533–561, 1995.

  13. Rhoades, D. A. and F. F. Evison, Long-range earthquake forecasting based on a single predictor, Geophys. J. R. Astron. Soc., 59, 43–56, 1979.

  14. Rhoades, D. A. and F. F. Evison, Long-range earthquake forecasting based on a single predictor with clustering, Geophys. J. Int., 113, 371–381, 1993.

  15. Suzuki, Z., Earthquake prediction, Ann. Rev. Earth Planet. Sci., 10, 235–256, 1982.

  16. Utsu, T., Seismicity of Japan from 1885 through 1925, Bull. E.R.I., 54, 253–308, 1979.

  17. Utsu, T., Seismicity of Japan from 1885 through 1925 (Correction and supplement), Bull. E.R.I., 57, 111–117, 1982.

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Correspondence to F. F. Evison.

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Evison, F.F., Rhoades, D.A. The precursory earthquake swarm in Japan: hypothesis test. Earth Planet Sp 51, 1267–1277 (1999) doi:10.1186/BF03351600

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Keywords

  • Performance Factor
  • Poisson Model
  • Earthquake Prediction
  • Acceptance Level
  • Performance Graph