In September, 2003, we conducted array measurements of microtremors at two sites (AVC and DHM) in Avcilar, the west part of Istanbul, Turkey, to estimate the S-wave velocity structures; this is a continuation of the same type observations carried out just after the 17 August 1999 Izmit earthquake. Heavy damage occurred around the AVC site due to the Izmit earthquake and a permanent strong-motion station is deployed at DHM. We used the SP AC method in estimation of phase velocities of Rayleigh waves within microtremors, and the genetic algorithm in estimation of the S-wave velocity structures from the phase velocities. Then the empirical amplification functions derived from aftershock records were compared with the theoretical ones calculated based on the structures. We obtained reasonably a good agreement between them, except one site of the tripartite array stations in AVC. The S-wave velocity structures estimated in this study provide basic data for prediction of strong-ground motion in Istanbul.
|Number of pages||15|
|Journal||Journal of the Hokkaido University, Faculty of Science, Series VII: Geophysics|
|Publication status||Published - Dec 1 2004|
All Science Journal Classification (ASJC) codes
- Ocean Engineering