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

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

Research output: Contribution to journalArticle

136 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)683-689
Number of pages7
JournalNature
Volume352
Issue number6337
DOIs
Publication statusPublished - 1991 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • General

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