Strong ground motion during the largest aftershock (Mw=5.8) of the 1999 Izmit earthquake, Turkey |
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Authors: | Nurcan Meral
zel Tsutomu Sasatani Ouz
zel |
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Institution: | aKandilli Observatory and Earthquake Research Institute of Boğazici University, 81220 Çengelköy, Istanbul, Turkey;bDivision of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, N10 W8 Sapporo 060-0810, Japan |
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Abstract: | We present a preliminary study of strong ground motion during the largest aftershock (Mw 5.8) of the 1999 Izmit earthquake (Mw 7.4), Turkey, at 11:55 on 13 September 1999. The peak ground acceleration observed near the epicentre of this aftershock was in agreement with that predicted by standard empirical prediction equations. Its spectral source parameters of the largest aftershock are also typical for a Mw 5.8 earthquake. At greater epicentral distances, there is an order-of-magnitude in scatter in peak ground acceleration values for this aftershock, which is attributed to site effects. The presence of thick layers of low-velocity sediments caused significant amplification of S-waves in the Avcılar district of Istanbul, at frequencies of 1 Hz, explaining the observed concentration of damage there as a result of the Izmit mainshock. |
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Keywords: | 1999 Izmit (Kocaeli) earthquake Peak ground acceleration Attenuation Source parameters Site effects |
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