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Source characteristics of shallow intraslab earthquakes derived from strong-motion simulations

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Abstract

Source modeling of recent shallow intraslab earthquakes is studied using strong-motion data. The total area of strong-motion generation areas obtained is smaller than the prediction from the empirical relationship for inland crustal earthquakes by Somerville and co-workers. Moreover, the ratio between the combined area of strong-motion generation areas obtained in this study and the area predicted by the empirical relationship, tends to decrease with focal depth. The stress drops on strong motion generation areas (or asperities) of shallow intraslab earthquakes increase with focal depth.

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Correspondence to Kimiyuki Asano.

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Asano, K., Iwata, T. & Irikura, K. Source characteristics of shallow intraslab earthquakes derived from strong-motion simulations. Earth Planet Sp 55, e5–e8 (2003) doi:10.1186/BF03351744

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Key words

  • Shallow intraslab earthquake
  • strong-motion generation
  • empirical Green’s function method
  • stress drop