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Deep structure of the northeastern Japan arc and its relationship to seismic and volcanic activity

Naturevolume 352pages683689 (1991) | Download Citation

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Abstract

Evidence for possible deep-seated magmatic activity beneath northeastern Japan can be obtained from seismic observations. Tomographic inversions of P-wave velocity data show low-velocity zones distributed in the crust and upper mantle beneath active volcanoes. In or around these zones, anomalously low-frequency micro-earthquakes, perhaps caused by magmatic activity, are found at depths of 25–40 km; distinct S-wave reflectors, corresponding to the upper surfaces of magma bodies, are found at depths of 10–18 km. Large crustal earthquakes also occur around the low-velocity zones. These observations reveal the distribution of magma reservoirs at depths and elucidate its relation with shallow seismicity beneath volcanic arcs.

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Author notes

    • Dapeng Zhao

    Present address: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, 99775, USA

Affiliations

  1. Observation Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University, Sendai, 980, Japan

    • Akira Hasegawa
    • , Dapeng Zhao
    • , Shuichiro Hori
    • , Akira Yamamoto
    •  & Shigeki Horiuchi

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https://doi.org/10.1038/352683a0

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