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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Hasegawa, A., Zhao, D., Hori, S. et al. Deep structure of the northeastern Japan arc and its relationship to seismic and volcanic activity. Nature 352, 683–689 (1991). https://doi.org/10.1038/352683a0
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DOI: https://doi.org/10.1038/352683a0
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