DEEP SUBSURFACE S-WAVE VELOCITY STRUCTURE OF OKINAWA ISLANDS, JAPAN—FOR NUMERICAL MODELING

Abstract

In this paper, we report the results of an analysis using microtremor array data to estimate a 1D S-wave velocity structure consisting of several layers and an S-wave 3 km/s layer around the Okinawa Islands. The depths of the top of S-wave 3 km/s layer at each site are 0.2 to 0.4 km in northern and western Okinawa Island and Kume Island, and 2.0 to 2.5 km in southern Okinawa Island. The average S-wave velocities of each layer (0.69, 1.10, 2.01, and 3.46 km/s) and the depth of the layer boundary are also presented for the four-layer model based on the estimation results for all locations.