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