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Three-dimensional P and S wave velocity structures beneath the Hokkaido corner, Japan-Kurile arc-arc junction

Earth, Planets and Space volume 58, pages e37–e40 (2006)Cite this article

Abstract

We applied an inverse method developed by Zhao et al. (J. Geophys. Res., 97, 19909–19928, 1992) to 42,834 P and 18,263 S wave arrival time data observed at 152 seismographic stations for 1143 local earthquakes at depths between 0 and 200 km in order to estimate three-dimensional P and S wave velocity structures beneath the Hokkaido corner, Japan-Kurile arc-arc junction. High- and low-velocity zones were clearly imaged in the Hidaka Mountain Range at depths shallower than 35 km. The low-velocity anomalies of P and S waves were found to be distributed in the mantle wedge at depths between 35 and 100 km beneath the volcanic front, as also observed in the Tohoku region. Another low-velocity zone was found to exist in the fore-arc region at depths of 50–70 km above the plate boundary; this zone was not detected in Tohoku, suggesting that the dehydration process in the fore-arc region is different from that in the Tohoku region.

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Authors and Affiliations

  1. Institute of Seismology and Volcanology, Hokkaido University, Sapporo, 060-0810, Japan

    Kei Katsumata, Naoto Wada & Minoru Kasahara

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  1. Kei Katsumata
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  2. Naoto Wada
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  3. Minoru Kasahara
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Correspondence to Kei Katsumata.

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Katsumata, K., Wada, N. & Kasahara, M. Three-dimensional P and S wave velocity structures beneath the Hokkaido corner, Japan-Kurile arc-arc junction. Earth Planet Sp 58, e37–e40 (2006). https://doi.org/10.1186/BF03352595

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  • DOI: https://doi.org/10.1186/BF03352595

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