Research for a new exploration technique of microtremor survey method through controlling over vertical directivities of sensor arrays

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This research has aimed to develop a new estimation technique that allows us to evaluate subsurface structures including structural boundaries or gradient layers within sensor arrays which used in microtremor survey method (MSM). Such heterogeneity decreases accuracy of the current MSM. We have focused on vertical directivities of sensor arrays, and elucidated some of its characteristics and controllability, and spotted an index function which indicates heterogeneity within arrays. Though we tried to arbitrarily control the vertical directivities through deforming sensor placement, it was found that it is necessary to further consideration.