Spatial and temporal analysis of the seismicity interactions of seismogenic faults in the central part of the Zagros region


School of Earth Sciences, Damghan University, Damghan, Iran


The Zagros region of Iran is known as one of the most seismically active regions of the world. At the central part of this region, Kazerun fault system (including Kazerun, Borazjan, and Dena faults) is located with a right-lateral strike slip mechanism and in a right-step pattern. In this research, based on the analysis of well-located seismic data, the seismicity interactions of this group of faults were assessed. The spatio-temporal analysis of seismicity and the assessment of seismic activity migrations indicate that Kazerun and Borazjan faults as well as Kazerun and Kare Bas fault systems show strong seismicity interactions. Additionally, this research attempts to reveal the role of the geometry and mechanism of fault systems in seismicity interactions.


صفری، حجت ا...، 1379، تحلیل دگر ریختی پهنه گسل سبز پوشان، رساله دکتری دانشگاه تربیت مدرس.
 عندلیبی، محمد جمیل. و اویسی، بهنام، 1380 ، سایزموتکتونیک مدرن، انتشارات تخت جمشید، شیراز ، چاپ اول.
غلامی ، ابراهیم، نوگل سادات ،میر علی اکبر ، خطیب ،محمد مهدی و یساقی ، علی، 1388، شواهد ساختاری از تاثیر گسل های شمالی -  جنوبی در توسعه دگرریختی های جنوب خاوریبیرجند، پهنه سیستان، مجله علوم زمین،شماره 71، ص 13-18. 
Alavi, M., 1994, Tectonics of zagros orogenic belt of Iran: new data interpretation, Tectonophysics, vol. 229, p. 211-238.
 Aochi, H., and Fukuyama, E., 2002, Three-dimensional nonplanar simulation of the 1992 Landers earthquake", J. Geophys, Res., Vol. 107, doi10.1029/2000JB000061.
Authemayou, C., 2005, Role of the Kazerun fault system in active deformation of the Zagros fold-and-thrust belt (Iran), Geoscience, Vol. 337, P. 539 -545.
Aydin, A., and Schultz, R. A., 1990, Effect of mechanical interaction on the development of strike-slip faults with echelon pattern, J. Struct. Geol., Vol. 12, p. 123-129.
 Bektas, O., EY.Boúlu , Y. and Maden , N, 2007 , Different Modes of Stress Transfer in Strike-slip Fault Zone: an Example From the North Anatolian Fault System in Turkey , Turkish Journal of Earth Sciences , Vol. 16 , pp. 1-12.
Berberian, M., 1976, An explanatory note on the first seismotectonic map of Iran; A seismo – tectonic review of the country”, Geol. Surv. Iran, Vol. 39, p. 7-141.
 Berberian, M., 1995, Master blind thrust fault hidden under the Zagros folds: active basement tectonics and surface morphotectonics”, Tectonophysics, Vol. 241, p. 193-224.
Gutenberg, B., and Richter, C.F., 1954, Seismicity of the Earth. 2nd ed., Princeton University Press, Princeton, NJ, 310 p.
 Hariss, R.A. and Day, S. M., 1993, Dynamics of fault interaction: parallel strike slip faults, J. Geophys.. Res., Vol. 98, p. 4461-4472.
Harris, R. A., and Day, S. M., (1999), Dynamic 3D simulations of earthquakes on en echelon faults, Geophys. Vol. 26, p. 2089–2092.
Kase, Y. and Day, S. M., (2006)," Spontaneous rupture processes on a bending fault", Geophys. Res., Vol. 33, doi: 10.1029 /2006GL025870.
Lacombe, O., Bellahsen, N. and Mouthereau, F., 2011, Fracture patterns in the Zagros Simply Folded Belt (Fars, Iran): constraints on early collisional tectonic history and role of basement faults, Geol. Mag. Cambridg University Press, doi10.1017/S001675681100029X.
Landgraf, A., Ballato, P., Strecker, M. R., Friedrich, A., Tabatabaei, S. H. and Shahpasandzadeh, M. ,2009, Fault-kinematic and geomorphic observations along the NorthTehran Thrust and Mosha Fasham Fault, Alborz Mountains Iran: implications for fault-system evolution and interaction in a changing tectonic regime, J. of Geophys,Res., Vol. 177, pp.676 – 690.
Oglesby, D., 2005, The Dynamics of Strike-Slip Step-Overs with Linking Dip-Slip Faults. Bulletin of the Seismological Society of America, Vol. 95, No. 5, pp. 1604–1622.
Pollitz, F., Vergnolle, M. and Calais, E., 2000, Fault interaction and stress triggering of twentieth century earthquakes in Mongolia, J. of Geophys., Vol.108.
 Scholz, C.H. and Gupta, A., 2000, Fault interactions and seismic hazard" Journal of Geodynamics, Vol.29, pp. 459-467.
Sibson, R. H., 1985, Stopping of earthquake ruptures at dilational fault Jogs", Nature, Vol. 316, p. 248-251.
Talebian, M. and Jackson, J., 2002, A reappraisal of earthquake focal mechanisms and active shortening in the Zagros mountain of Iran, J. Geophys.Res., Vol. 156, P. 506-526.
 Tatar, M., Hatzfeld, D., and Ghafori-Ashtiany, M., 2004, Tectonics of the central Zagros (Iran) deducedfrom microearthquakes seismicity, Geophys.J. Int., Vol. 156, pp.255 – 266.
Yassaghi, A., 2006, Integration of Landsat imagery interpretation and geomagentic data on verification of deep seated transverse fault lineaments in SE Zagros, Iran, Remote Sensing, Vol. 27, p. 4529-4544.
Zhang, Q., Zhang, P. Wang, C., Yi-peng, W and Ellis, M., 2003, Earthquake triggering and delaying caused by fault interaction on Xianshuihe fault belt southwestern China, ACTA Seismologica SINIKA, Vol16, No.2, pp 156-165.