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.
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Research Article|
August 01, 2003
Strong Motion Station Characterization and Site Effects during the 1999 Earthquakes in Turkey
Ellen M. Rathje, M.EERI
;
Ellen M. Rathje, M.EERI
a,b,c
Dept. of Civil Engineering, University of Texas, Austin, TX 78712
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Kenneth H. Stokoe, II, M.EERI
;
Kenneth H. Stokoe, II, M.EERI
a,b,c
Dept. of Civil Engineering, University of Texas, Austin, TX 78712
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Brent Rosenblad
Brent Rosenblad
a,b,c
Dept. of Civil Engineering, University of Texas, Austin, TX 78712
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Earthquake Spectra (2003) 19 (3): 653–675.
Article history
first online:
01 Jun 2020
Citation
Ellen M. Rathje, Kenneth H. Stokoe, Brent Rosenblad; Strong Motion Station Characterization and Site Effects during the 1999 Earthquakes in Turkey. Earthquake Spectra 2003;; 19 (3): 653–675. doi: https://doi.org/10.1193/1.1596212
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Index Terms/Descriptors
- acceleration
- alluvium
- Asia
- attenuation
- bedrock
- body waves
- building codes
- Cenozoic
- clastic sediments
- Duzce earthquake 1999
- earthquakes
- elastic waves
- experimental studies
- faults
- focus
- geologic hazards
- ground motion
- guided waves
- Holocene
- Istanbul Turkey
- Izmit earthquake 1999
- magnitude
- mechanical properties
- microseisms
- Middle East
- natural hazards
- peak ground acceleration
- Quaternary
- risk assessment
- S-waves
- sediments
- seismic networks
- seismic waves
- soils
- stiffness
- strong motion
- surface waves
- testing
- thickness
- Turkey
- velocity
- wave amplification
- weathering
Latitude & Longitude
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