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| | Abstract | | In this paper, the objective is to investigate the effect of irregularities on the microtremor wave field. The analysis is based on the 2.5-D thin layered and finite element method. Three-component microtremor observations were conducted at 15 sites in the Tokai area where ground with inclined boundary is estimated from the seismic reflection surveys. From the study, the following conclusions are made: 1) The difference of H/V spectra between 1-D and 2.5-D results is not large in the case of surface (Rayleigh and Love) waves incident from the shallow bedrock side. 2) The difference is large in the case of surface waves incident from the side of the ground with deep bedrock. 3) From the analysis of microtremor wave field due to various incident surface waves, it is found that H/V spectra calculated by 2.5-D analysis are in good agreement with those of observation data. This implies that microtremor H/V spectra are influenced by both body and surface waves generated from the irregularity of the ground. |
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