Source Parameters and Rupture characteristics of the 2017 earthquake in Kermanshah

Document Type : Original Research Article

Authors

1 Institute of Geophysics, Department of Seismology, University of Tehran, Tehran, Iran

2 Department of Geophysics, Tehran North Branch, Islamic Azad University, Tehran, Iran

Abstract

The Empirical Green Function and the Stochastic Finite-Fault Simulation were applied to estimate source parameters and rupture process of the November 12, 2017, earthquake with a moment magnitude of 7.3 in Ezgeleh, Kermanshah, Iran. The Ezgeleh earthquake was one of the most destructive and complex events that have occurred in this region; it seems several parallel faults have been activated. We determined the focal mechanism of the main event using first motion polarities. The result shows reverse faulting with a small strike-slip component. Also, the size of the asperity in this earthquake was estimated to be about 55km in the strike direction and 25km in the dip direction. To simulate this event, corner frequency, seismic moment, stress drop, duration, and the causative fault plane model were estimated. The simulated strong ground motions in comparison with the observed ones show good agreement; the result shows that the applied rupture model for this earthquake and the synthesizing methods are effective at simulating near-source ground motions in a broad-frequency range of engineering interest. Moreover, these approaches are successful and efficient in predicting the strong motions in the Zagros fold and thrust belt. This earthquake shows us that in areas with tectonics and seismic behavior similar to those of the Zagros fold and thrust belt, the possibility of such earthquakes is not unexpected. Therefore, it is necessary to simulate probable large earthquakes for the high safety design of these areas.

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References

Alexander, N., Chanerley, A. & Goorvadoo, N., 2001. A review of procedures used for the correction of seismic data. 10.4203/ccp.73.39, 101-102.
Ambraseys, N.N. & Melville, C.P., 2005. A history of Persian earthquakes. Cambridge, UK, Cambridge University Press.
Berberian, M., 1995. Master "blind" thrust faults hidden under the Zagros folds active basement tectonics and surface morphotectonics. Journal of Tectonophysics, 241, 193-224.
Boore, D.M. & Bommer, J.J., 2005. Processing of strong- motion accelerograms: needs, options and consequences. Soil Dynamics and Earthquake Engineering, 25(2), 93-115. https://doi.org/10.1016/j.soildyn.2004.10.007
Campbell, K.W. & Bozorgnia, Y., 2006. Campbell- Bozorgnia NGA empirical ground motion model for the average horizontal component of PGA, PGV, PGD, and SA at selected spectral periods ranging from 0.01-10.0 seconds. Pacific Earthquake Engineering Research Center, Berkeley, CA.
Courboulex, F., Virieux, J., Deschamps, A., Gilbert, D. & Zoll, A., 1996. Source investigation of a small event using empirical Green functions and simulated annealing. Geophysical Journal International, 125, 768-780.
DeLorenzo, S., Filippucci, M. & Boschi, E., 2007. An EGF technique to infer the rupture velocity history of a smallmagnitude earthquake. J.Geophys. Res., 113, B10314, https://doi:10.1029/2007JB005496
Nissen, E., Tatar, M., Jackson, J.A. & Allen, M.B., 2011. New views on earthquake faulting in the Zagros fold- and-thrust belt of Iran. Geophysical Journal International, 186(3), 928-944, https://doi.org/10.1111/j.1365-246X.2011.05119.x
Hartzell, S., 1978. Earthquake aftershocks as Green's functions. Geophysical Research Letters, 5, 1-4. Haskell, N.A., 1964. Total energy spectral density elastic of wave radiation from propagating faults. Bulletin of the Seismological Society of America, 54, 1811-1841.
Hutchings, L. & Viegas, G., 2012. Application of Empirical Green's Functions in Earthquake Source, Wave Propagation and Strong Ground Motion Studies. In: D'Amico S. (Ed), Earthquake Research and Analysis – New Frontiers in Seismology. Lawrence Berkeley National Laboratory, USA, 87-140.
Hutchings, L., 1987. Modeling near-source earthquake ground motion with empirical Green’s functions. Ph.D Thesis, State University of New York.
Imtiaz, A., Causse, M., Chaljub, E. & Cotton, F., 2015. Is Ground-Motion Variability Distance Dependent? Insight from Finite-Source Rupture Simulations. Bulletin of the Seismological Society of America, 105(2A), 950-962.
Irikura, K., 1991. The physical basis of the empirical Green function method and the prediction of strong ground motion for large earthquake. Proceedings International workshop of seismology and earthquake Engineering, 89-95.
Irikura, K., 1984. Prediction of strong ground motions using observed seismograms from small events. Proceedings of the 8th World Conference on Earthquake Engineering, 2, 465-472.
Jackson, J. & Fitch, T., 1981. Basement faulting and the focal depths of the larger earthquakes in the Zagros Mountains (Iran), Geophys. J. Int., 64, 561-586.
Karasözen, E., Nissen, E., Bergman, E.A. & Ghods, A., 2019. Seismotectonics of the Zagros (Iran) from orogen-wide, calibrated earthquake relocations. Journal of Geophysical Research: Solid Earth, 124, 9109-9129. https://doi.org/10.1029/2019JB01733
Honoré, L., Courboulex, F. & Souriau, A., 2011. Ground motion simulations of a major historical earthquake (1660) in the French Pyrenees using recent moderate size earthquakes. Geophysical Journal International, 187(2), 1001-1018. https://doi.org/10.1111/j.1365- 246X.2011.05193.x
Mohammadi, F. & Moradi, A., 2019. The Double Difference Relocation of sequence of 2017 Ezgeleh earthquake. 8th International Conference on Seismology and Earthquake Engineering (SEE8), Nov 11-13, Tehran. Iran.
Motazedian, D. & Atkinson, G.M., 2005a. Stochastic finite-fault modeling based on a dynamic corner frequency. Bulletin of the Seismological Society of America, 95, 995-1010.
Motazedian, D. & Atkinson, G.M., 2005b. Earthquake magnitude measurements for Puerto Rico. Bulletin of the Seismological Society of America, 95, 725-730.
Motazedian, D. & Atkinson, G.M., 2005c. Ground-motion relations for Puerto Rico. Geological Society of America, 385, 61-80. Niazi, M., Asudeh, I., Ballard, G., Jackson, J., King, G. & McKenzie, D., 1978. The depth of seismicity in the Kermanshah region of the Zagros Mountains (Iran). Earth and Planetary Science Letters, 40(2), 270-274.
Raghukanth, S.T.G., 2008. Modeling and synthesis of strong ground motion. Journal of Earth System Science, 117, 683-705.
Rezapor, M., Rezaee, R. & Tabatabaiy, S., 2018. Estimation of coda wave attenuation in the Kermanshah. 18th Iranian Geophysics Conference, Tehran, Iran, 509-512.
Road, H., 1973. Iranian Strong Motion Network (ISMN). Road, Housing & Urban Development Research Center, https://doi.org/10.7914/SN/I1
Shakal, A.F. & Bernreuter, D.L., 1980. Empirical analyses of near-source ground motion. United States.
Somerville, P., Irikura, K., Graves, R., 1999. Characterizing crustal earthquake slip models for the prediction of strong ground motion. Seismological Research Letters, 70(1), 59-80.
Talebian, M. & Jackson, J., 2004. A reappraisal of earthquake focal mechanisms and active shortening in the Zagros mountains of Iran. Geophys. J. Int., 156, 506-526.
Wan, K., Sun, X., Liu, Y., Ren, K., Sun, X. & Luo, Y., 2022. Spatial Coherency Model Considering Focal Mechanism Based on Simulated Ground Motions. Sustainability Journal, 14. https://doi.org/10.3390/su14041989
Wu, F., 1978. Prediction of strong ground motion using small earyhquakes. In Proceedings of 2nd International Conference on Microzonation Nati, Sci. Found., San Francisco. California, 701-704.
Yoshida, K., Uchida, N., Kubo, H., Takagi, R. & Xu, S., 2022. Prevalence of updip rupture propagation in interplate earthquakes along the Japan trench. Earth and Planetary Science Letters, 578, 117306. https://doi.org/10.1016/j.epsl.2021.117306.

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