掲載雑誌（和）： 日本地震工学シンポジウム講演集 Vol： 5巻 年： 1978年 頁： 297-304頁 著者（和）： - タイトル（和）： - 抄録（和）：
- キーワード（和）： - 掲載雑誌（英）： PROCEEDINGS OF JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM 著者（英）： Kojiro IRIKURA, Taku KAWANAKA タイトル（英）： CHARACTERISTICS OF MICROTREMORS IN A GROUND WITH STEEPLY VARYING STRUCTURE 抄録（英）：
The reports of the earthquake damages have been frequently noted that damage regions are sometime confined small zones, where the local geological configulations have steeply lateral variations. This shows it is necessary for the engineering-seismological study to estimate amplification effects of earthquake motions by lateral interference associated with the geological irregularity as well as vertical interference within the flat surfacelayers. In this paper, the characteristics of microtremors are examined, observed at an area where the underground structure is estimated to contain horizontally irregular interfaces. The spatial correlation characteristics of microtremors are significantly affected by the horizontal irregularity of surface layers, and the lateral variations of the amplitudes of microtremors are explainable by transmission and reflection of surface waves at vertical discontinuity. Observation on a horizontal array of microtremors is one of efficient methods to detect the zones with lateral irregularity of the local gelolgy and give a helping means to predict the spatial variations of the responses of seismic waves by lateral interference. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集