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<p><strong>Abstract.</strong> Rainfall-triggered fluid flow in a mechanical fracture zone associated with a seismic fault has been estimated (Tanaka et al., 2011) using muon radiography by measuring the water position over time in response to rainfall events. In this report, the data taken by Tanaka et al. (2011) are reanalyzed to estimate the porosity distribution as a function of a distance from the fault gouge. The result shows a similar pattern of the porosity distribution as measured bydoi:10.5194/gi-2-145-2013 fatcat:pumwqwzh5ffftgtbpe5cmkkqrm