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Volume 56 Supplement 8

Special Issue: IUGG Hagiwara Symposium

Repeating earthquakes and quasi-static slip on the plate boundary east off northern Honshu, Japan

Abstract

We have investigated spatio-temporal variation in small repeating earthquake activity in the 1989 earthquake swarm and used them to infer quasi-static slip distribution on the plate boundary off Sanriku, northern Honshu, Japan. Seismicity and inferred quasi-static slip accelerations propagated to the west and to the south during the swarm activity to trigger the occurrence of the largest earthquake (M7.1). To explain the migration of the seismicity and inferred quasi-static slip acceleration, we propose a conceptual model named the ‘chain reaction model’ in which large earthquakes generate large afterslips and then the afterslips accelerate the ruptures of the nearby asperities to generate the next earthquakes which are also followed by large afterslips, and so on. The model is applicable to a plate boundary where asperities are located sparsely but the afterslip associated with the rupture of an asperity can reach nearby asperities. Aftershock area expansion, which is conspicuous off Sanriku, is also explained by the model. If we can evaluate the slip deficit of a large asperity correctly, we will be able to issue a warning of large earthquake occurrence in some areas when we detect the acceleration of quasi-static slip near the asperity although the prediction is inevitably probabilistic.

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Correspondence to Toru Matsuzawa.

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Matsuzawa, T., Uchida, N., Igarashi, T. et al. Repeating earthquakes and quasi-static slip on the plate boundary east off northern Honshu, Japan. Earth Planet Sp 56, 803–811 (2004). https://doi.org/10.1186/BF03353087

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  • DOI: https://doi.org/10.1186/BF03353087

Keywords

  • Large Earthquake
  • Plate Boundary
  • Earthquake Swarm
  • Interplate Earthquake
  • Swarm Activity