微動の水平上下スペクトル比と震源特性を考慮した震度分布に関する研究 : 1997年愛知県東部の地震(M5.8)を例として

概要

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The 1997 Aichiken-Tobu Earthquake (M5.8) occured in 39 km depth beneath Mikawa region. By questionnaire survey method seismic intensitiy distribution was investigated to about 250 elementary schools in Mikawa region. And microtremor measurement have been carried out at the same schools. The purpose of this study is to interpretate the seismic intensity distribution from microtremor characteristics and souce effects. Seismic intensity increment is defined to be difference of seismic intensity of equivalent hypocentral distance in which source effects are excluded. In conclusion the period of peak horizontal-to-vertical spectral ratio of short-period microtremors is found to be in good agreement with seismic intensity increase. And the average of horizontal-to-vertical amplitude ratio of microtremors is better agreement with seismic intensity increase.
1999-05-30