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Geology
Tunnel samples provide evidence of earthquake fault characteristics
June 2nd, 2003
Rock samples taken from a tunnel that runs through an active fault zone in Japan have provided evidence to indicate the structure and hydrogeology of the fault. University of Utah hydrogeologist Craig Forster and colleagues examined rocks from boreholes deep within the Active Fault Survey Tunnel in Japan and used data from the fault's fluid content to infer the permeability and porosity within the Mozumi-Sukenobu fault. Such measurements, including a chlorofluorocarbon analysis to estimate the age of the water entering the tunnel through the zone's porous rocks, can help researchers better understand the fault's hydraulic structure and estimate the...
Source: Science Letter (2003-06-02)
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