GIS APPLICATIONS IN EARTHQUAKE ENGINEERING: NORTHWEST TURKEY

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Presentation transcript:

GIS APPLICATIONS IN EARTHQUAKE ENGINEERING: NORTHWEST TURKEY by Ali Sari Dept. of Civil Engineering, University of Texas at Austin

Main Topics of the Project Seismicity of Turkey Seismotectonic of Turkey 1999 Turkey Earthquakes Seismic Hazard Analysis - Seismic Hazard Mapping (Input Energy, Spectral Acceleration) - Site Effects

I. SEISMICITY OF TURKEY Historical and recent Earthquakes Epicenters Magnitudes or Intensities

B.C. 550-A.D. 2001, Turkey and Adjacent Areas ANATOLIAN PLATE NAF

II. SEISMOTECTONIC OF TURKEY

All Faults in Turkey

NAF System in Northwest Turkey

III. 1999 TURKEY EARTHQUAKES Kocaeli Earthquake, August 17, 1999 Duzce Earthquake, November 12, 1999

Kocaeli Earthquake, M7.4 Caused death of more than 30,000 people and damaged 50,000 buildings One of the largest recent earthquakes on record to hit a modern industrialized area Duzce Earthquake, M7.2 Caused death of more than 1,000 people and damaged 2,000 buildings

1999 Earthquakes and Damages

Strong Ground Motion Stations

IV. SEISMIC HAZARD ANALYSIS Spectral Acceleration (Sa), input Energy (Ai); for four different periods Beside ArcGIS software; uthaz.for, uthazall.for, nehrp.for, fortran programs are used during analysis

Algorithm for 0.3 sec. Sa with 5% Probability of Exceedance in 50 Years Characteristic Eq. Turkey-pois-3hz.char.out 3hz5pcsa.out Poisson distribution 5 % Period, 0.3 sec. Spectral Acc.

Seismic Hazard Maps for Sa (pga, 0.2, 0.3, 1 sec.)

Airport, Istanbul Sa, F=m*Sa T=0.6 sec.

IV. SEISMIC HAZARD ANALYSIS Including Soil Effect

Algorithm for 0.3 sec. Sa with 5% Probability of Exceedance in 50 Years including Site Effect A3hz5pcsa.out Amplified 5 % Spectral Acc.

Seismic Hazard Maps for Sa (pga, 0.2, 0.3, 1 sec.)

Airport, Istanbul NewSa, F=m*NewSa T=0.6 sec.

Conclusions Northwest region of Turkey has high seismicity NAF system causes severe earthquakes in this region Seismic hazard analysis shows that the Sa and Ai values for Istanbul are high with 5 % probability of exceedance in 50 years Soft soil amplifies the Sa and Ai values.

Acknowledges Dr. D. Maidment, Dr. L. Manuel (UT Austin) Mark Peterson (USGS, Colorado) Yesim Biro, M. Cem Ozbey (Kandilli Observatory, Turkey)