Akademik Veri Yönetim Sistemi
Yerbilimleri/ Earth Sciences, cilt.30, sa.1, ss.1-10, 2009 (Scopus)
In this study, a method for determining the safe distance from a fault is proposed. The method is based on quantitative evaluations related to field measurements. Those evaluations are not based on any artificial (building) or natural (geological) materials. The principle of the method is to measure the absorptivity of the environment close to the fault. The absorptivity of an environment between two receivers (the source and at least two receivers should have the same profile) is calculated from the natural logarithms of the spectral ratios of seismic waves (surface waves) recorded at these stations. Because of this linear relationship, absorptivity can be calculated from slope of the line. In other words, parameter A, which depends on seismic quality factor (Q) and seismic wave velocity (v), is determined from one or more seismic measurements carried out on the fault. A decrease in amplitude, (r), which depends on the spectral ratio of vibration amplitudes measured on the fault and the perpendicular x distance to the fault. Therefore, using the proposed method, a buffer zone width, x, may be computed for a desired earthquake with a known dominant frequency f, and an amplitude ratio r. In this study, the measurements were done along the fault line and on each block of the fault. If the vibration amplitude ratio,(r), is desired to be 0.1 for a 1 Hz dominant earthquake frequency, safe distances on the south and north blocks of the fault were calculated as 56 m and 73 m, respectively.