Abstract
To constrain the source of long period tremors (LPTs), we deployed a very dense broadband seismic network consisting of totally twenty-four stations around the active crater of Aso volcano in Kyushu, Japan. The spatial variation of the observed signal amplitudes reveals that the source of LPTs consists of an isotropic expansion (contraction) and an inflation (deflation) of an inclined tensile crack with a strike almost parallel to the chain of craters. The detected crack has a dimension of 1 km and its center is located a few hundred meters southwest of the active crater, at a depth of about 1.8 km. The extension of the crack plane meets the crater chain including the active fumarole at the surface, suggesting that the crack has played an important role in transporting gasses and/or lava to the craters from below. This work also demonstrates a powerful usage of broadband seismometers as geodetic instruments to constrain subsurface structures at active volcanoes.
| Original language | English |
|---|---|
| Pages (from-to) | 3677-3680 |
| Number of pages | 4 |
| Journal | Geophysical Research Letters |
| Volume | 26 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - Dec 15 1999 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Geophysics
- Earth and Planetary Sciences(all)
Cite this
Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan. / Yamamoto, Mare; Kawakatsu, Hitoshi; Kaneshima, Satoshi; Mori, Takehiko; Tsutsui, Tomoki; Sudo, Yasuaki; Morita, Yuichi.
In: Geophysical Research Letters, Vol. 26, No. 24, 15.12.1999, p. 3677-3680.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan
AU - Yamamoto, Mare
AU - Kawakatsu, Hitoshi
AU - Kaneshima, Satoshi
AU - Mori, Takehiko
AU - Tsutsui, Tomoki
AU - Sudo, Yasuaki
AU - Morita, Yuichi
PY - 1999/12/15
Y1 - 1999/12/15
N2 - To constrain the source of long period tremors (LPTs), we deployed a very dense broadband seismic network consisting of totally twenty-four stations around the active crater of Aso volcano in Kyushu, Japan. The spatial variation of the observed signal amplitudes reveals that the source of LPTs consists of an isotropic expansion (contraction) and an inflation (deflation) of an inclined tensile crack with a strike almost parallel to the chain of craters. The detected crack has a dimension of 1 km and its center is located a few hundred meters southwest of the active crater, at a depth of about 1.8 km. The extension of the crack plane meets the crater chain including the active fumarole at the surface, suggesting that the crack has played an important role in transporting gasses and/or lava to the craters from below. This work also demonstrates a powerful usage of broadband seismometers as geodetic instruments to constrain subsurface structures at active volcanoes.
AB - To constrain the source of long period tremors (LPTs), we deployed a very dense broadband seismic network consisting of totally twenty-four stations around the active crater of Aso volcano in Kyushu, Japan. The spatial variation of the observed signal amplitudes reveals that the source of LPTs consists of an isotropic expansion (contraction) and an inflation (deflation) of an inclined tensile crack with a strike almost parallel to the chain of craters. The detected crack has a dimension of 1 km and its center is located a few hundred meters southwest of the active crater, at a depth of about 1.8 km. The extension of the crack plane meets the crater chain including the active fumarole at the surface, suggesting that the crack has played an important role in transporting gasses and/or lava to the craters from below. This work also demonstrates a powerful usage of broadband seismometers as geodetic instruments to constrain subsurface structures at active volcanoes.
UR - http://www.scopus.com/inward/record.url?scp=0033573556&partnerID=8YFLogxK
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U2 - 10.1029/1999GL005395
DO - 10.1029/1999GL005395
M3 - Article
AN - SCOPUS:0033573556
VL - 26
SP - 3677
EP - 3680
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 24
ER -