Akademik Veri Yönetim Sistemi
3 th Bilsel International World Science and Research Congress, İstanbul, Türkiye, 17 - 18 Şubat 2024, ss.617-625, (Tam Metin Bildiri)
In this study; Site amplifications were determined for Eastern Marmara
Region by using Peak Ground Horizontal Acceleration (PGA) values.
Acceleration
records used in the study are the waveforms of the 17 August 1999 Kocaeli (Mw:7.4),
12 November 1999 Düzce (Mw:7.2) earthquakes and the earthquake
records from the time of these earthquake to to 2022 with a magnitude of larger
Mw>4.0. The
time of occurrence, epicenter, depth and magnitude of earthquakes were
downloaded from the ftp achieve of Kandilli Observatory and Earthquake Research
Institute (KOERI). Each earthquake types given by different organizations were
converted to moment magnitude. The peak acceleration values used in the
attenuation relationship were taken from permanent and temporary strong groun
motion stations installed by various national and international organizations
from 1999 Kocaeli Earthquake. In order to eliminate the noise from the
non-earthquake effects, a high pass cut-off frequency filters which is critical
to processing strong ground motion records were applied. The site
classifications for each strong ground motion stations were divided into ZA, ZB,
ZC, ZD, ZE classes specified in the Turkish Building Code. The equations were derived by dummy
variable approach in order to separate the effect of various soil
classifications named rock, soft rock, stiff soil and soft soil. Comparison
of ground motion predictions at station of interest to a nearby rock site is
considered a “reference” motion. The soil amplifications are 1.4 for soft rock
(ZC), 1.7 for stiff soil (ZD) and 2.2 for soft soil (ZE) were determined by
using residual acceleration approach.
Keywords: Peak ground
accelerations, residual acceleration, dummy variable.