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Experimental evidence on formation of imminent and short-term hydrochemical precursors for earthquakes

Authors :
Jianguo Du
Youlian Zhang
Kazuhiro Amita
Makoto Yamada
Shinji Ohsawa
Chunli Kang
Source :
Applied Geochemistry. 25:586-592
Publication Year :
2010
Publisher :
Elsevier BV, 2010.

Abstract

The formation of imminent hydrochemical precursors of earthquakes is investigated by the simulation for water–rock reaction in a brittle aquifer. Sixty-one soaking experiments were carried out with granodiorite and trachyandesite grains of different sizes and three chemically-distinct waters for 6 to 168 h. The experimental data demonstrate that water–rock reaction can result in both measurable increases and decreases of ion concentrations in short times and that the extents of hydrochemical variations are controlled by the grain size, dissolution and secondary mineral precipitation, as well as the chemistry of the rock and groundwater. The results indicate that water–rock reactions in brittle aquifers and aquitards may be an important genetic mechanism of hydrochemical seismic precursors when the aquifers and aquitards are fractured in response to tectonic stress.

Details

ISSN :
08832927
Volume :
25
Database :
OpenAIRE
Journal :
Applied Geochemistry
Accession number :
edsair.doi...........ee0a553febcc675d272a8d248821859e
Full Text :
https://doi.org/10.1016/j.apgeochem.2010.01.015