掲載雑誌（和）： 日本地震工学シンポジウム論文集 Vol： 9-3巻 年： 1994年 頁： E.55-E.60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 THE JAPAN EARTHQUAKE ENGINEERING SYMPOSIUM 著者（英）： Tomotaka IWATA, Kojiro IRIKURA タイトル（英）： ESTIMATION OF SOURCE, PROPAGATION-PATH, AND SITE EFFECTS USING 3-D SEISMIC ARRAY DATA 抄録（英）：
3-D array strong motion seismograms are compared with the synthetics computed by the full wave theory for a multi-layered structure model with a deterministic source. The target earthquake ground motions are from a MJMA 6.6 earthquake that occurred 70km east of the sites at a focal depth of 44km. First, we determine the seismic moment tenser and moment rate function of this earthquake using the direct S-wave part of the ground motions on four hard rock sites. Source parameters given are almost consistent with those from P-wave first motion determination and the CMT solution. Next, we examine the site effects on seismic motions using the vertical array seismograms from 0m to about 1km in depth. At the deepest point in the bed rock, there is a good agreement between the observed and synthetics computed assuming horizontally fiat layers. At shallower points, the direct S-wave portions of the synthetics are in good agreement with those of the observed, but later phases of the synthetics are poorer than those of observed. The arrival direction and apparent velocity of the later phases estimated from a surface small-aperture array data show that these later phases are mainly composed of surface waves that do not always come from the source direction directly. Those later phases can be regarded as secondarily generated waves by an edge of sedimentary basins from the simulation of the simple 2-D SH problem. These results show that one of the most important information required to predict ground motions is the surface geological condition. キーワード（英）： - 記事区分： - 区分 　　　委員会論文集