Estimation of Subsurface Structure Based on Microtremor and Gravity Survey in the Shikano Area, Tottori Prefecture, Japan

Abstract eng:
Shikano and Yoshioka earthquake fault occurred on the surface by the 1943 Tottori earthquake. In this study, subsurface structures were determined and we grasped characteristics of ground motion by microtremor and gravity survey in the Shikano area, Tottori Prefecture. Microtremor single-point 3-components observations and array observations were carried out at 304 and 34 sites respectively. As analysis of microtremor surveys data, we estimated S-wave velocity structures by using phase velocities obtained from array observations and predominant periods of H/V spectrum obtained from singlepoint 3-components observation records. Gravity observations were carried out at 38 sites. As analysis of gravity surveys data, gravity anomalies with assumed density in 2.4g/cm3 were obtained by using gravity databases, existing data in the east-part of Tottori Prefecture and this study data. 3D density structures from the distribution of gravity anomalies were estimated. We simulated strong ground motions at 3 seismic stations where subsurface structures are different. Then we could evaluate difference of characteristics of seismic ground motion.

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