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 |
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Pages (from-to) | 3677-3680 |
Number of pages | 4 |
Journal | Geophysical Research Letters |
Volume | 26 |
Issue number | 24 |
DOIs | |
Publication status | Published - 1999 Dec 15 |
Externally published | Yes |
ASJC Scopus subject areas
- Earth and Planetary Sciences (miscellaneous)
- Earth and Planetary Sciences(all)
- Geophysics