Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..122..229a&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 122, Issue 3-4, p. 229-239.
Physics
10
Scientific paper
Erzincan basin, eastern Turkey, is seismically very active pull-apart basin and developed in between the eastern segments of the north anatolian fault zone. A study of the regional and site attenuation of seismic waves of earthquakes in this area will contribute in predicting earthquake generated ground-motion and becomes vital in making decisions for earthquake regulations and building codes, especially for the cities on the north anatolian fault zone. In this paper, anelastic and scattering attenuation in Erzincan region is investigated by using of multiple lapse time window (MLTW) method based on the hypothesis of multiple isotropic scattering with uniform distribution of scatters. It is found that the scattering and intrinsic Q-1 are almost equal for 3Hz and lower frequencies and intrinsic attenuation is dominant over scattering attenuation for 6Hz and higher frequencies. Model fitting was quite good for almost all frequencies at long distances, more scattered data and observed poor model fitting at low frequencies (1.5Hz) and short distances (5-15km) may indicate the complexities in the shallower part of crust in Erzincan. The seismic albedo is 0.52 for 1.5Hz and 0.32 for 12Hz. Le-1 value increases slightly with frequency as 0.058 for 1.5Hz and 0.032 for 12Hz. The coda Qc-1 determined from the decay rate of coda waves is similar to Qs-1 for 1.5 and 3Hz and it is close to Qt-1 for frequencies higher than 3Hz. We found that the scattering attenuation is strongly frequency dependent, decreasing proportional to f1.48 whereas intrinsic Qi-1 is considerably less frequency dependent f1.1. A decrease of Qs-1 faster than f1.0 with increasing frequency implies that the medium may be characterized by a Gaussian rather than exponential auto-correlation function.
Akinci Aybige
Eyidoǧan Haluk
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