Abstract
Combined geological and geophysical surveys are effective in finding hidden active faults and estimating the dimensions of their fracture zones in the northern part of the Kinki District, southwest Japan. The magnetotelluric method using electromagnetic energy in the ELF frequency band can define the dimensions of a fault and suggest whether it is active or not. The results of the survey show that individual active strike-slip faults may be linked through new faults found in unexposed areas. The distribution of major active faults suggest that they form conjugate sets defining boundaries to tectonic blocks. At least seven tectonic blocks are recognized with different patterns of occurrence of microearthquakes and distributions of active faults. Historically large earthquakes, magnitude >5 as determined by maximum velocity amplitude, occur at the boundaries of the blocks. These patterns are caused by the different stress fields applied to each block.
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