Low‐velocity zones in the crust beneath Aso caldera, Kyushu, Japan, derived from receiver function analyses

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  • Yuki Abe
    Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Minamiaso Japan
  • Takahiro Ohkura
    Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Minamiaso Japan
  • Takuo Shibutani
    Disaster Prevention Research Institute Kyoto University Uji Japan
  • Kazuro Hirahara
    Division of Earth and Planetary Sciences, Graduate School of Science Kyoto University Kyoto Japan
  • Shin Yoshikawa
    Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Minamiaso Japan
  • Hiroyuki Inoue
    Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science Kyoto University Minamiaso Japan

書誌事項

公開日
2017-03
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016jb013686
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Aso volcano, in central Kyushu Island in southwest Japan, has a large caldera (18 × 25 km) that formed by the ejection of more than 600 km<jats:sup>3</jats:sup> of deposits 89 thousand years ago. We calculated receiver functions from teleseismic waveform data obtained from densely distributed stations in and around the caldera. We estimated the crustal <jats:italic>S</jats:italic> wave velocity structure from the receiver functions by using genetic algorithm inversion. We detected a low‐velocity zone (<jats:italic>Vs</jats:italic> > 2.2 km/s) at a depth of 8–15 km beneath the eastern flank of the central cones. A sill‐like deformation source has been detected at a depth of 15.5 km by analyses of GPS data, and a swarm of low‐frequency earthquakes exists at depths of 15–25 km just beneath this low‐velocity zone. Magma may be newly generated and accumulated in this low‐velocity zone as a result of hot intrusions coming from beneath it. Except for the region beneath the eastern flank of the central cones, a second low‐velocity zone (<jats:italic>Vs</jats:italic> > 1.9 km/s) extends in and around the caldera at a depth of 15–23 km, although phenomena representing intrusions have not been detected below it. From the estimated velocity structure, these low‐velocity zones are interpreted to contain a maximum of 15% melt or 30% water.</jats:p>

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