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

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

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.352..683h&link_type=abstract

Nature, Volume 352, Issue 6337, pp. 683-689 (1991).

Physics

39

Scientific paper

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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