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

本研究的目的是开发一种新的估计技术，使我们能够评估地下结构，包括结构边界或梯度层内的传感器阵列中使用的微动调查方法（MSM）。这种异质性降低了当前MSM的准确性。我们集中在传感器阵列的垂直方向性，并阐明了它的一些特性和可控性，并发现了一个指标函数，表明阵列内的异质性。虽然我们试图通过改变传感器的位置来任意控制垂直方向性，但发现有必要进一步考虑。

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.