Release of mantle and crustal helium from a fault following an inland earthquake

Umeda, Koji; Asamori, Koichi; Kusano, Tomohiro

This study was undertaken to elucidate spatial and temporal changes of $^{3}$ He/ $^{4}$ He ratios around a source region before and after an inland earthquake using both new and existing helium isotope data from hot spring and drinking water wells. Most gas samples near the seismic source region are characterized by increase in postseismic $^{3}$ He/ $^{4}$ He ratios. In contrast, the postseismic ratios decrease by up to about 30% away from the seismic source region. Episodic faulting could release accumulated radiogenic helium from host rocks, or enhance the transfer of mantle volatiles through permeable fault zones, such that subsequent fluid flow proximal to the source region could then explain the spatio-temporal variations in $^{3}$ He/ $^{4}$ He ratios.

Language	:	English
Journal	:	Applied Geochemistry
Volume	:	37
Number	:
Pages	:	p.134 - 141
Publication Year/Month	:	2013/10
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Paper URL	:	https://doi.org/10.1016/j.apgeochem.2013.07.018
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Keywords	:	no keyword
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Article of JAEA R&D Review	:	Large Inland Earthquake Triggered by Latent Magmatism; Helium Isotopes as a Tool for Detecting Concealed Active Faults[/]
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Registration No. : AA20120982
JAEA Abstracts No. : 41001368
Paper Submission No. : 13348

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