SEGJ Technical Conference

Estimation of fundamental mode Rayleigh wave attenuation coefficient using surface wave method.

Abstract To accurately evaluate the amplification characteristics of seismic motion in the surface layer, the estimation of both the S-wave velocity structure and the attenuation characteristics (e.g., Q value) of the surface layer is important. The Q value is associated with the damping coefficient, and therefore, it is necessary to precisely estimate the damping coefficient in order to accurately estimate the Q value. We used surface wave exploration data to determine the damping coefficient of the shallow surface. Since the damping coefficient assumes the fundamental mode, the estimation accuracy of the damping coefficient may decrease if the higher-order mode is predominant in the recorded surface wave exploration data. Therefore, after separating the higher-order mode from the surface wave exploration data, the attenuation coefficient was estimated.