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Aftershock probabilistic seismic hazard analysis for Bushehr province in Iran using ETAS model

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Abstract

Aftershock probabilistic seismic hazard analysis (APSHA) has a key role in risk management after a major earthquake. The main goal of the current study is to assess aftershock hazard in a strategic and earthquake-prone region of Iran (Bushehr province). Bushehr province is a strategic region in the Middle East due to its major petroleum export facilities, industrial corridors and the Bushehr nuclear power plant. To prepare APSHA for Bushehr province, a seismic source is selected which surrounds the active faults in the study area. A uniform earthquake catalog is collected which contains information on a total of 1143 earthquakes (Mw > 4) occurred in the study area from 1900 to 2018. Aftershock parameters are calculated using the epidemic-type aftershock sequence model. Aftershock sequences follow a non-homogenous Poisson’s process, and their magnitude and location depend on the size and location of the mainshock. In this study, APSHA is performed for the intervals of 1, 7 and 30 days after the mainshock, by assuming occurrence of mainshocks with return periods of 475 and 2475 years. The results show that the aftershock hazard curve is greater than that of the mainshock hazard curve.

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Availability of data and materials

The R package ETAS is available at http://CRAN.R-project.org/package=ETAS and GitHub at https://github.com/jalilian/ETAS (under GPL 2 license). The earthquake catalog is extracted from the data center of International Institute of Earthquake Engineering and Seismology (http://www.iiees.ac.ir/fa/eqcatalog/).

Abbreviations

ETAS:

Epidemic-type aftershock sequence

APSHA:

Aftershock probabilistic seismic hazard analysis

Mw:

Moment magnitude scale

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Acknowledgements

We wish to thank Mohammad Shahvar for his help in providing the magnitude conversation relations. We also acknowledge the help of R. Goodarzi and S.M. Hosseini in editing of figures.

Funding

This research was funded by the Babol Noshirvani University of Technology under the Grant No. BUT/388011/97.

Author information

ND analyzed the data, completed all experiments and wrote the manuscript. HRT proposed the initial idea and guided us in the analysis. MZ directed us to create a seismic catalog and seismic zoning. AJ developed the ETAS model code. All authors read and approved the final manuscript.

Correspondence to Hamid Reza Tavakoli.

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Davoudi, N., Tavakoli, H.R., Zare, M. et al. Aftershock probabilistic seismic hazard analysis for Bushehr province in Iran using ETAS model. Nat Hazards 100, 1159–1170 (2020). https://doi.org/10.1007/s11069-020-03854-8

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Keywords

  • Aftershock
  • Mainshock
  • Seismic hazard analysis
  • Bushehr province of Iran
  • ETAS model