Download A Study of Ground Motion Attenuation from the August 1999 Kocaeli

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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
I.
II.
III.
IV.
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
NAF
ANATOLIAN
PLATE
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
TURKEY.POIS.IN
-Geographic Coordinates
-Attenuation Relationships
-Fault Segments
3HZ5PCSA.OUT
-Geographic Coordinates
-Spectral Acceleration
3HZ5PCSA.DBF
UTHAZ
.FOR
USING ARCGIS
UTHAZALL
.FOR
SEISMIC HAZARD MAP
SEISMIC HAZARD MAP
(GIS)
(GIS)
TURKEY-POIS-3HZ.CHAR.OUT
-Annual Probability of Exceedance
-Spectral Acceleration
Characteristic Eq.
Turkey-pois-3hz.char.out
Poisson distribution
Period, 0.3 sec.
3hz5pcsa.out
5%
Spectral Acc.
Seismic Hazard Maps for Sa (pga, 0.2, 0.3, 1 sec.)
Airport, Istanbul
Sa, F=m*Sa
5% Probability of Exceedance in 50 yrs
2
T=0.6 sec.
Spectral Acceleration (g)
Airport
1.5
1
0.5
0
0
0.2
0.4
Period (s)
0.6
0.8
1
IV. SEISMIC HAZARD ANALYSIS
Including Soil Effect
Algorithm for 0.3 sec. Sa with 5% Probability of
Exceedance in 50 Years including Site Effect
SOILTYPES.IN
-Geographic Coordinates
-Soil Types
3HZ5PCSA.OUT
-Geographic Coordinates
-New Spectral Acceleration
NEHRP
.FOR
A3HZ5PCSA.OUT
-Geographic Coordinates
-New Spectral Acceleration
A3HZ5PCSA.DBF
A3hz5pcsa.out
Amplified 5 %
Spectral Acc.
USING ARCGIS
SEISMIC HAZARD MAP
SEISMIC HAZARD MAP
(GIS)
(GIS)
Seismic Hazard Maps for Sa (pga, 0.2, 0.3, 1 sec.)
Airport, Istanbul
NewSa, F=m*NewSa
5% Probability of Exceedance in 50 yrs
T=0.6 sec.
Spectral Acceleration (g)
2
Airport
Airport, Site Class D
1.5
1
0.5
0
0
0.2
0.4
Period (s)
0.6
0.8
1
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)
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