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The January 17, 1995 Hyogoken-Nanbu Earthquake caused catastrophic disaster, especially on the eastern part of Kobe area. I measured natural radioactivity from the ground surface of Higashinada, Ashiya and the south-west part of Nishinomiya for the purpose of detection of the buried faults in this region. I found several sites where the total gamma-ray dose rate was anomalously high compared to the surrounding area. A part of these sites delinates the hypothetical line which can be considered the southwest extension of Koyo Fault. Another hypothetical line parallel to this line can be obtained by anomalous points. These two imaginary lines are considered as buried fault lines. As a result of nuclide analysis, the activity of either daughters of Uand Th-series from the high radioactivity points is stronger than that from their surrounding normal level radioactivity points. The excess of both daughters of Uand Th-series on the high radioactivity points cannot be elucidated by the phenomena of up-welling Rn. One possibility of explanation on this excess is by the immigration of dissolved Ra through the fracture of surrounding rocks along faults.

Measurement of Ground Surface Gamma-ray on the Urban Area of Eastern Kobe