Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan

Mare Yamamoto, Hitoshi Kawakatsu, Satoshi Kaneshima, Takehiko Mori, Tomoki Tsutsui, Yasuaki Sudo, Yuichi Morita

Research output: Contribution to journalArticle

45 Citations (Scopus)

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 languageEnglish
Pages (from-to)3677-3680
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number24
DOIs
Publication statusPublished - Dec 15 1999
Externally publishedYes

Fingerprint

craters
volcanoes
crater
Japan
crack
volcano
cracks
tremors
broadband
fumarole
deflation
seismographs
lava
seismograph
inflation
contraction
spatial variation
stations
detection
expansion

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 journalArticle

Yamamoto, M, Kawakatsu, H, Kaneshima, S, Mori, T, Tsutsui, T, Sudo, Y & Morita, Y 1999, 'Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan', Geophysical Research Letters, vol. 26, no. 24, pp. 3677-3680. https://doi.org/10.1029/1999GL005395
Yamamoto, Mare ; Kawakatsu, Hitoshi ; Kaneshima, Satoshi ; Mori, Takehiko ; Tsutsui, Tomoki ; Sudo, Yasuaki ; Morita, Yuichi. / Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan. In: Geophysical Research Letters. 1999 ; Vol. 26, No. 24. pp. 3677-3680.
@article{07f1ac711d6d43c0bdad50c967098b14,
title = "Detection of a crack-like conduit beneath the active crater at Aso volcano, Japan",
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.",
author = "Mare Yamamoto and Hitoshi Kawakatsu and Satoshi Kaneshima and Takehiko Mori and Tomoki Tsutsui and Yasuaki Sudo and Yuichi Morita",
year = "1999",
month = "12",
day = "15",
doi = "10.1029/1999GL005395",
language = "English",
volume = "26",
pages = "3677--3680",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "24",

}

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

UR - http://www.scopus.com/inward/citedby.url?scp=0033573556&partnerID=8YFLogxK

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 -