Ground uplift detected by precise leveling in the Ontake earthquake swarm area, central Japan in 2002-2004

Fumiaki Kimata; Rikio Miyajima; Masayuki Murase; Dudy Darwaman; Takeo Ito; Yusaku Ohata; Meilano Irwan; Kazutomo Takano; Fauzan Ibrahim; Etsuro Koyama; Hiroshi Tsuji; Teturo Takayama; Kazuya Uchida; Jun Okada; David Solim; Herri Anderson

doi:10.1186/BF03353324

Fumiaki Kimata, Rikio Miyajima, Masayuki Murase, Dudy Darwaman, Takeo Ito, Yusaku Ohata, Meilano Irwan, Kazutomo Takano, Fauzan Ibrahim, Etsuro Koyama, Hiroshi Tsuji, Teturo Takayama, Kazuya Uchida, Jun Okada, David Solim, Herri Anderson

Author information

Fumiaki Kimata
Graduate School of Environmental Studies, Nagoya University
Rikio Miyajima
Graduate School of Environmental Studies, Nagoya University
Masayuki Murase
Graduate School of Environmental Studies, Nagoya University
Dudy Darwaman
Graduate School of Environmental Studies, Nagoya University
Takeo Ito
Graduate School of Environmental Studies, Nagoya University
Yusaku Ohata
Graduate School of Environmental Studies, Nagoya University
Meilano Irwan
Graduate School of Environmental Studies, Nagoya University
Kazutomo Takano
Graduate School of Environmental Studies, Nagoya University
Fauzan Ibrahim
Graduate School of Environmental Studies, Nagoya University
Etsuro Koyama
Earthquake Research Institute, University of Tokyo
Hiroshi Tsuji
Earthquake Research Institute, University of Tokyo
Teturo Takayama
Disaster Prevention Research Institute, Kyoto University
Kazuya Uchida
Graduate Schoo1 of Science, Kyushu University
Jun Okada
Graduate Schoo1 of Science, Hokkaido University
David Solim
Department of Geodesy, Institute of Technology
Herri Anderson
Department of Geodesy, Institute of Technology

Keywords: Ground uplift, precise leveling, Ontake earthquake swarm, shallow seismogenic layer, low resistivity layer, ³He/⁴He ratio, δ¹³C, CO₂

JOURNAL FREE ACCESS

2004 Volume 56 Issue 12 Pages e45-e48

DOI https://doi.org/10.1186/BF03353324

Details

Abstract

Repeated precise leveling in the earthquake swarm area of Ontake, central Japan has revealed uplift of 3-6 mm in proximity to the epicentral region of the most active earthquake cluster in 2002-2004. Although the uplift is small, the vertical displacement is significant even considering leveling error. This uplift is associated with increases in ³He/⁴He ratios and CO₂ δ¹³C values at a mineral spring in the region, indicating an upper mantle contribution. A region of low resistivity at a depth of 2 km beneath the uplift area has also been inferred, suggesting that the observed uplift is related to changes in a shallow seismogenic layer due to increased hydrothermal input from the earthquake swarm area.

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