The 1995 Hyogo-Ken Nambu Earthquake caused a large scale of damage on wooden dwellinghouses in Japan. This damage showed us necessity of the new seismic design proceduresconsidering the severe earthquake and investigation on dynamic behavior of wooden structures.Our research group conducted the field survey with microtremor measurement for seismicretrofitting Japanese timber dwelling houses on a part of Tokai district, which is afraid ofdamage by an expected Tokai earthquake or To-Nankai earthquake. We measured microtremormeasurement to compare between before and after vibration characteristics on seismic retrofiteffect.As a result of these investigations, it was grasped that the natural frequency after seismicretrofit construction was higher than before.
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