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| | Abstract | | Recent increase of the troubles caused by aging of social infrastructure is a pressing challenge for our society. Takaiwa water tunnel, 275m long underground waterway dug in the late Edo Period, supplies water to 152ha paddy field. But recently some spring waters from the crack of the tunnel are found at a nearby village, which may cause to induce landslides. We carried out combined geophysical survey, seismic refraction and resistivity survey, in this tunnel. As a result, near surface structures up to 20m back of the tunnel wall were clearly imaged. Combined seismic velocity (P-wave velocity) and resistivity survey turned out to be possible to evaluate the geological condition and the degree of the long-term deterioration of water tunnels. |
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