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Temporal Variations of Seismic Parameters in Tehran Region

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Abstract

The study of earthquake precursors can lead to deliver an entirely measurable, time varying estimation of the coming events which is strongly based on physical and geological principals and fully responsive to any future examination. The temporal variation of the seismic parameters such as “b” values, in the Gutenberg–Richter formula logN = a − bM, some details of the pre-shock accelerating moment release (AMR) and the variation of the Thirumalai and Mountain (TM) metric before the past big event is investigated in the vicinity of the Tehran city. The temporal variation of the b-value in some cases strongly supports the assumption that it has potential to be used as a precursory signal. In addition, analysis of the pre-shock AMR along with the inverse TM metric signal in the region shows deviations from the background long-term behavior prior to some of the bigger events in the studied area. The aggregation of these signs suggests that a combination of studied physical precursors has a potential which could be employed in a medium term earthquake warnings.

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(Modified from Sharland et al. 2001)

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Acknowledgements

This work was carried out at the Department of physics of the Earth, Institute of Geophysics, University of Tehran. We would like to thank head of the Institute of Geophysics, Dr. Nabi Bidhendi, for his kind support during the performance of this project, and we would also like to extend our sincere thanks to the Armed Forces of the Islamic Republic of Iran’s elite Foundation for their support.

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    Javad Kazemian & Mohammad Reza Hatami

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Kazemian, J., Hatami, M.R. Temporal Variations of Seismic Parameters in Tehran Region. Pure Appl. Geophys. 174, 3841–3852 (2017). https://doi.org/10.1007/s00024-017-1549-3

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