Near-Field Probabilistic Seismic Hazard Analysis of Metropolitan Tehran Using Region-Specific Directivity Models

Ground motions are affected by directivity effects at near-fault regions which result in low-frequency cycle pulses at the beginning of the velocity time history. The directivity features of near-fault ground motions can lead to significant increase in the risk of earthquake-induced damage on engine...

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Bibliographic Details
Published in:Pure and applied geophysics 2017, Vol.174 (1), p.117-132
Main Authors: Yazdani, Azad, Nicknam, Ahmad, Dadras, Ehsan Yousefi, Eftekhari, Seyed Nasrollah
Format: Article
Language:English
Subjects:
Computer simulation
Directivity
Earth and Environmental Science
Earth Sciences
Earthquake engineering
Earthquakes
Fault lines
Geophysics/Geodesy
Ground motion
Plate tectonics
Probabilistic methods
Probability
Probability theory
Risk assessment
Seismic hazard
Seismology
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Summary:Ground motions are affected by directivity effects at near-fault regions which result in low-frequency cycle pulses at the beginning of the velocity time history. The directivity features of near-fault ground motions can lead to significant increase in the risk of earthquake-induced damage on engineering structures. The ordinary probabilistic seismic hazard analysis (PSHA) does not take into account such effects; recent studies have thus proposed new frameworks to incorporate directivity effects in PSHA. The objective of this study is to develop the seismic hazard mapping of Tehran City according to near-fault PSHA procedure for different return periods. To this end, the directivity models required in the modified PSHA were developed based on a database of the simulated ground motions. The simulated database was used in this study because there are no recorded near-fault data in the region to derive purely empirically based pulse prediction models. The results show that the directivity effects can significantly affect the estimate of regional seismic hazard.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-016-1389-6