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| | Abstract | | The 2011 off the Pacific coast of Tohoku Earthquake damaged many small earth dams. Aftershocks and heavy rain might cause further damage. Especially, it was necessary to understand the range of the crack to prevent such secondary disaster, and to decrease the reservoir water level. Therefore, we executed the electrical prospecting before and after the salt water injection into the crack, and presumed the range of the crack from the difference of the resistivity distribution. The validity of the presumption depth of cracks was confirmed by the subsequent digging investigation. It is thought that such an investigation method using the electrical prospecting is effective for the crack investigation immediately after the earthquake. |
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