Comparison of Different Site Response Estimation Techniques Using Aftershocks of the 1999 Izmit Earthquake

摘要: On 17 August 1999, the M W 7.4 Izmit earthquake occurred in northwestern Turkey. A temporary seismic network was installed to improve geometry of a previously network. In this study, 262 aftershocks with magnitude L ranging between 0.4 and 4.5 were analyzed using digital recordings from stations these networks. S -wave P spectral records, corrected for path attenuation function, inverted by means generalized inversion technique (GIT). The GIT site responses compared those calculated horizontal-to-vertical (H/V) ratios applied both data pre-event noise. most cases, H/V provided shapes consistent obtained GIT. However, level amplification occasionally found be different. general, discrepancies can explained either affecting vertical component ground motion that we detected or waves having propagation almost direction. Using ratio noise, not only peaks fundamental resonance frequencies, but similar amplifications showed tendency exceed inversion. Finally, up factor 5 are placed over complex topography. For sites, always correctly identified technique, earthquakes