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Volume 56 Supplement 3

Special Issue: Special section for the 2003 Tokachi-oki earthquake

Low frequency events occurred during the sequence of aftershock activity of the 2003 Tokachi-Oki earthquake; a dynamic process of the tectonic erosion by subducted seamount

Earth, Planets and Space volume 56, pages 347–351 (2004)Cite this article

Abstract

During the sequence of aftershock activity of the 2003 Tokachi-Oki earthquake, anomalous events predominant in low-frequency components occurred very close to a subducted seamount around the junction between the Kuril Trench and the Japan Trench. The low-frequency wave train in the coda part reflects the strong excitation of surface waves and the source depth is considered to be very shallow. The focal mechanism of the low-frequency event is a type of the reverse fault. Considering with the source depth and the mechanism, the low-frequency event might have occurred on the plate boundary as a dynamic process of the tectonic erosion by the subducted seamount.

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Authors and Affiliations

  1. National Research Institute for Earth Science and Disaster Prevention, 3-1 Tenno-dai, Tsukuba, Ibaraki, 305-0006, Japan

    Kazushige Obara, Yoshikatsu Haryu, Yoshihiro Ito & Katsuhiko Shiomi

Authors
  1. Kazushige Obara
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  2. Yoshikatsu Haryu
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  3. Yoshihiro Ito
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  4. Katsuhiko Shiomi
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Correspondence to Kazushige Obara.

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Obara, K., Haryu, Y., Ito, Y. et al. Low frequency events occurred during the sequence of aftershock activity of the 2003 Tokachi-Oki earthquake; a dynamic process of the tectonic erosion by subducted seamount. Earth Planet Sp 56, 347–351 (2004). https://doi.org/10.1186/BF03353063

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  • DOI: https://doi.org/10.1186/BF03353063

Key words

  • Low-frequency earthquake
  • 2003 Tokachi-Oki earthquake
  • subduction zone
  • tectonic erosion
  • seamount
  • plate boundary