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Strong motion station characterization and site effects during the 1999 earthquakes in Turkey

Ellen M. Rathje, Kenneth H. Stokoe and Brent Rosenblad
Strong motion station characterization and site effects during the 1999 earthquakes in Turkey
Earthquake Spectra (August 2003) 19 (3): 653-676

Abstract

The 1999 Kocaeli and Duzce earthquakes in Turkey generated a moderate amount of strong ground motion data. This paper describes the shear-wave velocity profiles measured at a number of strong motion stations in Turkey using the spectral-analysis-of-surface-waves (SASW) method. The shear-wave velocity profiles from SASW testing compare well with deeper profiles developed by microtremor surface wave inversion, but SASW provides more shear-wave velocity resolution near the ground surface. The developed shear-wave velocity profiles are used to define site classifications for each station. For the Kocaeli earthquake, event-specific attenuation relationships are developed. These relationships show considerable amplification of peak ground acceleration and spectral acceleration (at a period of 0.3 s) at deep soil sites in the far field, but no amplification in the near-fault region. For spectral accelerations at longer spectral periods (1.0 and 2.0 s), amplification is indicated in both the near field and far field. Amplification factors derived from the Kocaeli earthquake strong motion data are generally larger than those used in current attenuation relationships and building codes. The short-period amplification factors derived from the regression decrease with increasing rock motion intensity (PGArock), and the derived long-period amplification factors increase with increasing PGArock. These trends are most likely due to soil nonlinearity. The increase in long-period amplification factors with PGArock is not taken into account in current building codes.


ISSN: 8755-2930
EISSN: 1944-8201
Serial Title: Earthquake Spectra
Serial Volume: 19
Serial Issue: 3
Title: Strong motion station characterization and site effects during the 1999 earthquakes in Turkey
Affiliation: University of Texas at Austin, Department of Civil Engineering, Austin, TX, United States
Pages: 653-676
Published: 200308
Text Language: English
Publisher: Earthquake Engineering Research Institute, Berkeley, CA, United States
References: 26
Accession Number: 2020-080050
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables, sketch map
N40°00'00" - N41°30'00", E28°30'00" - E32°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 2020
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