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

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

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ep%26s...56e..45k&link_type=abstract

Earth, Planets and Space, Volume 56, p. e45-e48.

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Scientific paper

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 d13C 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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