Mechanism of phreatic eruptions at Aso volcano inferred from near- field broadband seismic observations

Satoshi Kaneshima, Hitoshi Kawakatsu, Hirotoshi Matsubayashi, Yasuaki Sudo, Tomoki Tsutsui, Takao Ohminato, Hisao Ito, Koichi Uhira, Hitoshi Yamasato, Jun Oikawa, Minoru Takeo, Takashi Iidaka

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Abstract

Broadband seismometers deployed at Aso volcano in Japan have detected a hydrothermal reservoir 1 to 1.5 kilometers beneath the crater that is continually resonating with periods as long as 15 seconds. When phreatic eruptions are observed, broadband seismograms elucidate a dynamic interplay between the reservoir and discharging flow along the conduit: gradual pressurization and long-period (-20 seconds) pulsations of the reservoir during the 100 to 200 seconds before the initiation of the discharge, followed by gradual deflation of the reservoir concurrent with the discharging flow. The hydrothermal reservoir, where water and heat from the deeper magma chamber probably interact, appears to help control the surface activity at Aso volcano.

Original languageEnglish
Pages (from-to)642-645
Number of pages4
JournalScience
Volume273
Issue number5275
Publication statusPublished - Aug 2 1996
Externally publishedYes

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Cite this

Kaneshima, S., Kawakatsu, H., Matsubayashi, H., Sudo, Y., Tsutsui, T., Ohminato, T., ... Iidaka, T. (1996). Mechanism of phreatic eruptions at Aso volcano inferred from near- field broadband seismic observations. Science, 273(5275), 642-645.