By using slip model from USGS and focal mechanism and aftershocks distribution from Iranian Seismological Center (IRSC) for Sarpol-e Zahab earthquake (Mw 7.3) on November 12, 2017, we investigated the correlation between Coulomb stress changes and aftershocks distribution. In this study, about 500 aftershocks with magnitude larger than 2.5 and azimuthal gap less than 180 degrees were selected. Calculated Coulomb stress changes on the optimally oriented faults showed that most of the seismicity occurred in regions of increased stress and the majority of them concentrated on the ruptured plane, especially in west and south parts. Besides, nodal planes of the selected 11 aftershocks received positive Coulomb stress changes. Therefore, there is a good correlation between Coulomb stress changes and aftershocks distribution in Sarpol-e Zahab event. Furthermore, calculated static stress on the surrounding faults showed that middle part of the High Zagros Fault (HZF), the northern part of the Main Recent Fault (MRF), and the northern part of the Zagros Foredeep Fault (ZFF) are located in the positive stress change area.
Vernant, P., Nilforoushan, F., Hatzfeld, D., Abbassi, M.R., Vigny, C., Masson, F., Nankali, H., Martinod, J., Ashtiani, A., Bayer, R., and Tavakoli, F. (2004) Present-day crustal deformation and plate kinematics in the Middle East constrained by GPS measurements in Iran and northern Oman. Geophysical Journal International, 157(1), 381-398.
Toda, S., Lin, J., and Stein, R.S. (2011) Using the 2011 M=9.0 Tohoku earthquake to test the Coulomb stress triggering hypothesis and to calculate faults brought closer to failure. Earth, Planets and Space, 63, 725-730.
Parsons, T., Stein, R.S., Simpson, R.W., and Reasenberg, P.A. (1999) Stress sensitivity of fault seismicity: A comparison between limited-offset oblique and major strike-slip faults. Journal of Geophysical Research: Solid Earth, 104(B9), 20183-20202.
Sumy, D.F., Cochran, E.S., Keranen, K.M., Wei, M., and Abers, G.A. (2014) Observations of static Coulomb stress triggering of the November 2011 M5.7 Oklahoma earthquake sequence. Journal of Geophysical Research: Solid Earth, 119(3), 1904-1923.
Steacy, S., Jimenez, A., and Holden, C. (2013) Stress triggering and the Canterbury earthquake sequence. Geophysical Journal International, 196(1), 473-480.
Reasenberg, P.A. and Simpson, R.W. (1992) Response of regional seismicity to the static stress change produced by the Loma Prieta earthquake. Science, 255(5052), 1687-1690.
Ma, K.F., Chan, C.H., and Stein, R.S. (2005) Response of seismicity to Coulomb stress triggers and shadows of the 1999 Mw = 7.6 Chi-Chi, Taiwan, earthquake. Journal of Geophysical Research: Solid Earth, 110(B5).
King, G.C., Stein, R.S., and Lin, J. (1994) Static stress changes and the triggering of earthquakes. Bulletin of the Seismological Society of America , 84(3), 935-953.
Walker, R.T., Andalibi, M.J., Gheitanchi, M.R., Jackson, J.A., Karegar, S., and Priestley, K. (2005) Seismological and field observations from the 1990 November 6 Furg (Hormozgan) earthquake: a rare case of surface rupture in the Zagros Mountains of Iran. Geophysical Journal International, 163(2), 567-579.
Madanipour, S., Ehlers, T.A., Yassaghi, A., Rezaeian, M., Enkelmann, E., and Bahroudi, A. (2013) Synchronous deformation on orogenic plateau margins: Insights from the Arabia-Eurasia collision. Tectonophysics, 608, 440-451.
Motaghi, K., Shabanian, E., and Kalvandi, F. (2017) Underplating along the northern portion of the Zagros suture zone, Iran. Geophysical Journal International, 210(1), 375-389.
Talebian, M. and Jackson, J. (2004) A reappraisal of earthquake focal mechanisms and active shortening in the Zagros mountains of Iran. Geophysical Journal International, 156(3), 506-526.
Solaymani Azad, S., Saboor, N., Moradi, M., Ajhdari, A., Youssefi, T., Mashal, M., and Roustaie, M. (2017) Preliminary Report on Geological Features of the Ezgaleh-Kermanshah Earthquake (M~7.3), November 12, 2017, West Iran. SSD of GSI Preliminary
Report Number: 17-01, ver.01
Hessami, K., Jamali, F., and Tabasi, H. (2003) Major Active Faults Map of Iran, Scale 1:2500000. International Institute of Earthquake Engineering and Seismology.
Scholz, C.H. (2002) The Mechanics of Earthquakes and Faulting. Cambridge University Press.
Stein, R.S. (1999) The role of stress transfer in earthquake occurrence. Nature, 402(6762), p. 605.
Steacy, S., Marsan, D., Nalbant, S.S., and McCloskey, J. (2004) Sensitivity of static stress calculations to the earthquake slip distribution. Journal of Geophysical Research: Solid Earth, 109(B4).
Steacy, S., Gomberg, J., and Cocco, M. (2005) Introduction to special section: Stress transfer, earthquake triggering, and time-dependent seismic hazard. Journal of Geophysical Research: Solid Earth, 110(B5).
Zarifi, Z., Nilfouroushan, F., and Raeesi, M. (2014) Crustal stress map of Iran: insight from seismic and geodetic computations. Pure and Applied Geophysics, 171(7), 1219-1236.
Maleki Asayesh, B., Zafarani, H., & Najafi, N. (2018). Role of Transferred Static Stress Due to Sarpol-e Zahab Earthquake in Aftershock Distribution. Journal of Seismology and Earthquake Engineering, 20(2), 37-44.
Behnam Maleki Asayesh; Hamid Zafarani; Neda Najafi. "Role of Transferred Static Stress Due to Sarpol-e Zahab Earthquake in Aftershock Distribution". Journal of Seismology and Earthquake Engineering, 20, 2, 2018, 37-44.
Maleki Asayesh, B., Zafarani, H., Najafi, N. (2018). 'Role of Transferred Static Stress Due to Sarpol-e Zahab Earthquake in Aftershock Distribution', Journal of Seismology and Earthquake Engineering, 20(2), pp. 37-44.
Maleki Asayesh, B., Zafarani, H., Najafi, N. Role of Transferred Static Stress Due to Sarpol-e Zahab Earthquake in Aftershock Distribution. Journal of Seismology and Earthquake Engineering, 2018; 20(2): 37-44.