Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j.121k&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 121-1, CiteID 1483, DOI 10.1029/2001GL014030
Physics
5
Hydrology: Groundwater Hydrology, Physical Properties Of Rocks: Fracture And Flow, Physical Properties Of Rocks: Permeability And Porosity, Structural Geology: Fractures And Faults
Scientific paper
Three boreholes with depths of 500, 800, and 1800 m were drilled near the Nojima fault, which is one of the 1995 Hyogoken-Nanbu earthquake faults. In order to research the structure and its temporal change of the active fault, the water injection experiments were conducted from the 1800-m borehole in 1997 and 2000. Then, the discharge changes at the 800-m borehole were observed during the water injections. Considering the permeable zone near the fault as simple two-dimensional layer with an uniform thickness, we estimated the permeability of the permeable zone near the Nojima fault from the discharge changes associated with the water injections. It is found that the permeability of the permeable zone in 2000 became lower than that in 1997.
Fujimori Kunio
Kitagawa Yuuichi
Koizumi Naoji
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