DETERMINATION OF SUBSURFACE STRUCTURE OF THE SEASIDE AREA OF KURAYOSHI PLAIN, TOTTORI PREFECTURE BY MICROTREMOR AND GRAVITY EXPLORATION

Abstract

 Microtremor and gravity surveys have been carried out in the Kurayoshi plain to obtain information of subsurface structures for prediction of earthquake strong ground motion. In this study, to add explorations data, 3-components single site observation and array observation were carried out at 65 sites and 5 sites respectively as microtremor exploration. And gravity surveys were carried out at 80 sites. Subsurface structures were determined by adding new data to exiting data. In the results, subsurface structures were obtained newly as follows. S-wave velocity models and distribution of predominant period from microtremor exploration and gravity anomaly distribution and density subsurface structure from gravity exploration were determined.