Estimation of S-wave velocity structures in avcilar-Istanbul from array microtremor measurements

Oguz Ozel, Tsutomu Sasatani, Kazuyoshi Kudo, Hiroshi Okada, Tatsuo Kanno, Seiji Tsuno, Masataka Yoshikawa, Shinako Noguchi, Masakazu Miyahara, Hiroyuki Goto

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)115-129
Number of pages15
JournalJournal of the Hokkaido University, Faculty of Science, Series VII: Geophysics
Volume12
Issue number2
Publication statusPublished - Dec 1 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Geophysics

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