Variations of Instrumental Seismic Intensity by Installation Conditions

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  • 地盤-建物アレー観測による震度の設置環境変動

Abstract

Nowadays seismic intensity scale has become important information for real time counter-measures soon after disastrous earthquakes. However, some investigations of damage due to recent earthquakes such as the 2003 Miyagiken Hokubu Earthquake revealed problems over how and where to set an instrument for measuring seismic intensity. The difference in seismic intensity between at the ground surface and in buildings has especially drawn attention form engineers. This paper deals with the variations of seismic intensity using records due to an array observation system for ground and building motions. The array observation system, which was installed at the campus of Tohoku Inst. of Tech. 15 years ago, has obtained some 90 motion records simultaneously at different sites of the free ground surface, the first floor and fourth floor of a 4-story building. The instrumental intensity scales were obtained from the records to compare their values at the different sites. The results made it statistically clear that the intensity at the first floor is smaller by about 0.2 than the one at the ground surface. This difference was also found in array observation of microtremors, leading to a conclusive remark so that microtremors are useful to predict a difference of seismic intensity depending on installation sites.

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