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| | Abstract | | In order to estimate damages caused by strong ground motions from a mega-thrust earthquake, it is important to evaluate broadband ground-motion features in wide area. To realize it, it is necessary to sophisticate subsurface structure models, on which shallow and deep subsurface structures are integrated. In this study, at first, we collected as many records as possible obtained by microtremor and earthquake observation in Gunma and Tochigi Prefecture. And then, using geological models based on the results of boring surveys as reference, subsurface structure model from seismic bedrock to ground surface was improved based on records of microtremor and earthquake observation in those areas. |
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