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  • Open Access

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 Space201456:BF03353063

https://doi.org/10.1186/BF03353063

  • Received: 30 November 2003
  • Accepted: 16 February 2004
  • Published:

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.

Key words

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

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