模擬常時微動に関するパラメトリックスタディーおよび常時微動記録への適用

概要

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The paper attempts to illustrate the potential application of simulation technique for interpretation and characterization of microtremors. The simulation model involves a large number of Difac wave type sources randomly distributed on the surface of a horizontally layered ground underlain by the half-space. Simulation technique is utilized for the interpretation of microtremors at two sites. One of the sites, denoted as JMA and located in Kushiro city, has a shallow base layer and strong impedance contrast, while the other in Chiba prefecte and denoted as KASAI has a deep base layer and weak impedance contrast. The parameter R_F, defined as the ratio between horizontal and vertical input forces at the source, is introduced as a measure of the proportion of Love wave components in combination with Rayleigh waves contained in simulated microtremors The microtremor records at JMA site are found to correspond to the simulation with R_F=0 7 indicating large proportion of Love waves, while that at KASAI corresponds to the simulation with R_F = 0.1, indicating the dominance of Rayleigh wave components.
社団法人日本建築学会の論文
2000-09-30