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Declustering of Iran earthquake catalog (1983–2017) using the epidemic-type aftershock sequence (ETAS) model

  • Research Article - Solid Earth Sciences
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Abstract

The main goal of this article is to decluster Iranian plateau seismic catalog by the epidemic-type aftershock sequence (ETAS) model and compare the results with some older methods. For this purpose, Iranian plateau bounded in 24°–42°N and 43°–66°E is subdivided into three major tectonic zones: (1) North of Iran (2) Zagros (3) East of Iran. The extracted earthquake catalog had a total of 6034 earthquakes (Mw > 4) in the time span 1983–2017. The ETAS model is an accepted stochastic approach for seismic evaluation and declustering earthquake catalogs. However, this model has not yet been used to decluster the seismic catalog of Iran. Until now, traditional methods like the Gardner and Knopoff space–time window method and the Reasenberg link-based method have been used in most studies for declustering Iran earthquake catalog. Finally, the results of declustering by the ETAS model are compared with result of Gardner and Knopoff (Bull Seismol Soc Am 64(5):1363–1367, 1974), Uhrhammer (Earthq Notes 57(1):21, 1986), Gruenthal (pers. comm.) and Reasenberg (Geophys Res 90:5479–5495, 1985) declustering methods. The overall conclusion is difficult, but the results confirm the high ability of the ETAS model for declustering Iranian earthquake catalog. Use of the ETAS model is still in its early steps in Iranian seismological researches, and more parametric studies are needed.

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Abbreviations

Re:

Reasenberg

Uh:

Uhrhammer

G-K:

Gardner and Knopoff

Gr:

Gruenthal method

ETAS:

Epidemic-type aftershock sequence model

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Acknowledgements

The authors acknowledge the funding support of Babol Noshirvani University of Technology through Grant No. BUT/388011/97. We wish to appreciate Mohammad Shahvar for his help in providing the earthquake catalog and magnitude conversation relations used in this article.

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Authors and Affiliations

  1. Department of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

    Nader Davoudi & Hamid Reza Tavakoli

  2. Department of Seismology, International Institute of Earthquake Engineering and Seismology, Tehran, Iran

    Mehdi Zare

  3. Department of Statistics, Razi University, Kermanshah, Iran

    Abdollah Jalilian

Authors
  1. Nader Davoudi
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  2. Hamid Reza Tavakoli
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  3. Mehdi Zare
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  4. Abdollah Jalilian
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Contributions

HRT proposed the initial idea and guided us in the analysis. ND analyzed the data completed all experiments and wrote the manuscript. 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.

Corresponding author

Correspondence to Hamid Reza Tavakoli.

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The authors declare that they have no conflict of interest.

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Davoudi, N., Tavakoli, H.R., Zare, M. et al. Declustering of Iran earthquake catalog (1983–2017) using the epidemic-type aftershock sequence (ETAS) model. Acta Geophys. 66, 1359–1373 (2018). https://doi.org/10.1007/s11600-018-0211-5

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  • DOI: https://doi.org/10.1007/s11600-018-0211-5

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