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

2. 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

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

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

5. II. SEISMOTECTONIC OF TURKEY

6. All Faults in Turkey

7. NAF System in Northwest Turkey

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

9. 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

11. 1999 Earthquakes and Damages

12. Strong Ground Motion Stations

13. 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

14. 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.

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

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

18. IV. SEISMIC HAZARD ANALYSIS
Including Soil Effect

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

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

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

22. 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.

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