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| | Abstract | | It has been happened cave-in accidents in urban areas recently because of cavity occurrences above the decrepit underground infrastructures. Shallow geophysics for cavity explorations in the urban areas cannot show the sufficient performance because of the low S/N ratio by vibration or electromagnetic man-made noises. In this paper we have studied the geophysical exploration method using cosmic ray muons to avoid the man-made noises. Soil density is able to estimate from the muon intensity which is penetrated through the underground. We have conducted the theoretical calculations of the muon intensity in uniform soil preliminary. The calculating condition is as follows, 1. soil covering depths are set up from 5m to 40m, 2. cavity diameters are set up from 0.5m to 4m, 3. zenith angles of the cavities from the detector are set up from 0, 30 and 60 degrees. Cavity is able to detect until the one tenths diameters of soil covering depth using by cosmic ray muons intensity. We will consider the development of the detector and the geotomographic analysis. |
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