Estimation of Ground Structure Based on Shallow Underground Structure Survey Using Microtremor Array Method

Abstract eng:
It is well known that seismic motions and earthquake damages varied greatly depending on the characteristic of the soil involved and the propagation characteristics of the seismic motions. Furthermore, advances in IT technologies and analysis technologies have been improving the accuracy of seismic motion estimation on a daily basis, making it ever more important to assess ground structure in greater detail to provide the basic information for estimating seismic motions. We selected some of the site as the study target and used the miniature array proposed by Cho et al. (2013)［1］ to estimate 1D and 2D velocity profiles. We compared the result with the s-wave velocity profile obtained from boring survey and the existing single-point microtremor observation results. And also we performed the drawing of estimated 2D velocity structures at the target sites where there have specific configuration of the ground. Based on this model, we were able to confirm the distribution of the loam layer near the ground surface and also to infer the existence of several gaps in the velocity structure inside the Basin.

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