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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.
Express Letter

On the change of 3He/4He ratios in hot spring gases after The Iwate-Miyagi Nairiku Earthquake in 2008

KEIKA HORIGUCHI, JUN-ICHI MATSUDA
Geochemical Journal, Vol. 42, No. , P. e1-e4, 2008

ABSTRACT

The Iwate-Miyagi Nairiku Earthquake in 2008 (M7.2) occurred on June 14th 2008 in the northeastern Japan, Iwate Prefecture. We collected water and gas samples in hot springs from seven localities around the epicenter of the earthquake on June 21st and 22nd, one week after the earthquake, and measured the 3He/4He ratio and He and Ne concentrations of the dissolved gases. We found 10-85% increases in 3He/4He ratios in five hot springs, while we found 11-35% decrease in two others. The positive anomalies were interpreted as upwelling of aqueous fluid containing mantle 3He beneath the earthquake region. It is possible that ascending fluids triggered the earthquake.

KEYWORDS

helium isotopes, noble gas, earthquake, epicenter, Japan

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