S-Wave Velocity Distribution of the Northern Isparta Urban Area With the Method of Seismic Refraction Microtremor (ReMi).

The refraction-microtremor (ReMi) method has been recently developed to obtain average shear wave velocity (Vs30) at the depth of 30 m. In both UBC (Uniform Building Code) and EC8 (Eurocode 8), soil classification is carried out by analyzing the Vs30 values. The Isparta urban area, under high earthquake risk, has been growing on the basin deposits, therefore identification of Vs30 parameters in this area is very important for engineering surveys. The ReMi method ,which uses microtremor noise generated by heavy traffic, is the most reliable way to obtain information on the shallow shear wave velocities in densely populated areas. In this work, the method was applied to about 4 km² of the northern edge of the Isparta urban area. From this application, it is aimed to determine Vs30 velocity distribution and velocity-depth information up to 100 m depth in the study area. Totally 54 ReMi data have been collected in the area. These data were processed, converted to velocity-depth information, and then Vs30 velocity distribution map was prepared. The soil classification has been done according to UBC and EC8. Vs30 velocity distribution map implies the presence of two distinct soil classifications (C and D) in area. In addition, soil amplification and predominant periods have been determined at the points where the velocity reaches 760 m/s as seismic basement within the depth of 100 m. [ABSTRACT FROM AUTHOR]