New insights into the 2017 Sefidsang earthquake by Coulomb stress change pattern and aftershock distributions: implication for active tectonics of NE Iran

Document Type : Research Paper


Department of Geology , Payame Noor University (PNU), 19395-4697 Tehran, Iran


The April 5th 2017 Mw 6.15 Sefidsang earthquake occurred east-northeast of the town of Fariman near the Cimmerian arc-related Fariman complex. The stress distribution was estimated by seismic parameters and Coulomb stress distribution in the source region. Inferred Coulomb stress field and general pattern of aftershocks distribution revealed that the Sefidsang earthquake occurred on a northeast-dipping listric fault with dextral reverse movement. Proximity of the Sefidsang sequence to Fariman complex proposes the reactivation of the pre-existing Cimmerian arc-related faults in the present-day stress field. The crustal-penetrating low-angle inverted faults coupled with Mesozoic mafic–ultramafic magmatism can shed light on the structural aspects of the region. The kinematics was also investigated by GPS velocity fields and morphotectonic features. The counterclockwise block rotation under the left-lateral regional shear between the Doruneh fault system and the North Kopeh Dagh fault system and NE-oriented coeval shortening led to the formation of rhombic structures. Cimmerian-related basement faults in NE Iran confined the expansion of rhombic cells and sense of block rotation. The results of this study improved our understanding about kinematics of active deformation in NE Iran and had important implications for seismic hazard assessment of the region and potential future failure area.


Article Title [فارسی]


Aflaki, M., Mousavi, Z., Ghods, A., Shabanian, E., Vajedian, S., Akbarzadeh, M., 2019. The 2017 Mw 6 Sefid Sang earthquake and its implication for the geodynamics of NE Iran. Geophysical Journal International, 218(2): 1227-1245.##
Aki, M., 1965. Maximum likelihood estimate of b in the formula log N = a − bM and its confidence limits. Bulletin of Earthquake Research Institute of the University of Tokyo, 43: 237-239.##
Alavi, M., 1992. Thrust tectonics of the Binalood region, NE Iran. Tectonics, 11(2): 360-370.##
Alavi, M., 1996. Tectonostratigraphic synthesis and structural style of the Alborz mountain system in northern Iran. Journal of Geodynamics, 21(1): 1-33.##
Allen, C., Amand, P., Richter C., Nordquist J., 1965. Relation between seismicity and geological
structure in the southern California region. Bulletin of the Seismological Society of America, 55:
Ambraseys, N., Melville, C., 1982. A History of Persian Earthquakes. Cambridge University Press, Cambridge, U. K.##
Aron, A., Hardebeck, J., 2009. Seismicity rate changes along the central California coast due to stress changes from the 2003 M 6.5 San Simeon and 2004 M 6.0 Parkfield earthquakes. Bulletin of the  Seismological Society of America, 99: 2280-2292.##
Bender, B., 1983. Maximum-likelihood estimation of b values for magnitude grouped data. Bulletin of 38 Nedaei & Alizadeh the Seismological Society of America, 73: 831-851.##
Berberian, M., 1981. Active faulting and tectonics of Iran. In: Gupta, H. and Delany, F. (Eds), Zagros- Hindu Kush-Himalaya Geodynamic Evolution, Geodynamic Series, Chapter 3, American
Geophysical Union, pp. 33-69.##
Berberian, M., King, G., 1981. Towards a palaeogeography and tectonic evolution of Iran. Canadian Journal of Earth Sciences, 18: 210-265.##
Berberian, M., Yeats, R., 1999. Patterns of historical earthquake rupture in the Iranian Plateau. Bulletin of the Seismological Society of America, 89: 120 - 139.##
Berberian, M., Yeats, R., 2001. Contribution of archaeological data to studies of earthquake history in the Iranian Plateau. Journal of Structural Geology, 23: 563 - 584.##
Bufe, C.G., 1970. Frequency-magnitude variations during the 1970 Danville earthquake swarm.
Earthquake Notes, 41: 3-6.##
Carey-Gailhardis, E., Mercier, J.-L., 1987. A numerical method for determining the state of stress using focal mechanism of earthquake populations: application to Tibetan teleseisms and microseismicity of southern Peru. Earth and Planetary Science Letters, 82: 165-179.##
Catalli, F., Chan, C., 2012. New insights into the application of the Coulomb model in real-time.
Geophysical Journal International, 188(2): 583-599.##
Catalli, F., Meier, M., Wiemer, S., 2013. The role of Coulomb stress changes for injection-induced seismicity: the Basel enhanced geothermal system. Geophysical Research Letters, 40: 72-77.##
Darvishzadeh, A., 1991. Geology of Iran. Neda Publication, Tehran, Iran, 901pp. (in Persian).
Das, S., Scholz, C. H., 1981. Off-fault aftershock clusters caused by shear stress increase. Bulletin of the Seismological Society of America, 71: 1669-1675.##
DeMets, C., Gordon, R. G., Argus, D. F., Stein, S., 1994. Effect of recent revisions to the geomagnetic reversal timescale on estimates of current plate motions. Geophysical Research Letters, 21(20): 2191- 2194.##
Deng, J., Sykes, L.R., 1997. Stress evolution in southern California and triggering of moderate, small, and micro-size earthquakes. Journal of Geophysical Research, 102: 24411-24435.##
England, P., Jackson, J., 1989. Active deformation of the continents. Annual Reviews of Earth and Planetary Science, 17: 197-226.##
Gibowicz, S.J., 1973. Variation of the frequency-magnitude relation during earthquake sequences in New Zealand. Bulletin of the Seismological Society of America, 63: 517-528.##
Görgün, E., Zang, A., Bohnhoff, M., Milkereit, C., Dresen, G., 2009. Analysis of Izmit aftershocks 25 days before the November 12th 1999 Düzce earthquake, Turkey. Tectonophysics, 474 (3-4): 507-515.##
Guest, B., Axen, G., Lam, P., Hassanzadeh, J., 2006. Late Cenozoic shortening in the west‐central Alborz Mountains, northern Iran, by combined conjugate strike‐slip and thin‐skinned deformation, Geosphere, 2(1): 35-52.##
Gutenberg, B., Richter, C.F., 1944. Frequency of earthquakes in California. Bulletin of the
Seismological Society of America, 34: 185-188.##
Haji Aghajany, S., Pirooznia, M., Raoofian Naeeni, M., Amerian, Y., 2020. Combination of Artificial Neural Network and Genetic Algorithm to Inverse Source Parameters of Sefid-Sang Earthquake Using InSAR Technique and Analytical Model Conjunction. Journal of the Earth and Space Physics, 45(4): 121-131.##
Hainzl, S., Moradpour, J., Davidsen, J., 2014. Static stress triggering explains the empirical aftershock distance decay. Geophysical Research Letters, 41: 8818-8824.##
Hainzl, S., Steacy, S., Marsan, D., Seismicity models based on Coulomb stress calculations. Community Online Resource for Statistical Seismicity Analysis (2010), 32035809##
Hardebeck, J., Nazareth, J.J., Hauksson, E., 1998. The static stress change triggering model: constraints from two southern California aftershock sequences. Journal of Geophysical Research, 103: 24427-24437.##
Harris, R., 1998. Introduction to special section: stress triggers, stress shadow, and implications for seismic hazard. Journal of Geophysical Research, 103: 24347-24358.##
Harris, R., Simpson, R.W., 1998. Suppression of large earthquakes by stress shadows: a comparison of Coulomb and rate-state failure. Journal of Geophysical Research, 103: 24439-24451.##
Harris, R., Simpson, R.W., Reasenberg, P.A., 1995. Influence of static stress changes on earthquake locations in southern California. Nature, 375: 221-224.##
Hatzidimitriou, P., Papadimitriou Mountrakis, D., Papazachos, B., 1985. The seismic parameter b of the frequency-magnitude relation and its association with the geological zones in the area of Greece. Tectonophysics, 120: 141-151.##
Hollingsworth, J., 2007. The active tectonics of NE Iran, Ph.D. thesis, University of Cambridge,
Cambridge, U. K. Hollingsworth, J., Fattahi, M., Walker, R., Talebian, M., Bahroudi, A., Bolourchi, M.J., Jackson, J., Copley, A., 2010. Oroclinal bending, distributed thrust and strike-slip faulting, and the accommodation of Arabia-Eurasia convergence in NE Iran since the Oligocene. Geophysical Journal International, 181: 1214-1246.##
Ishibe, T., Shimazaki, K., Tsuruoka, H., Yamanaka, Y., Satake, K., 2011. Correlation between Coulomb stress changes imparted by large historical strike-slip earthquakes and current seismicity in Japan. Earth, Planets, Space, 63: 301- 314.##
Jackson, J., 1992. Partitioning of strike-slip and convergent motion between Eurasia and Arabia in eastern Turkey and the Caucasus. Journal of Geophysical Research, 97: 12471-12479.##
Jackson, J.A., McKenzie, D.P., 1984. Active tectonics of the Alpine-Himalayan Belt between western Turkey and Pakistan. Geophysical Journal of the Royal Astronomical Society, 77: 185-264.##
Karimpour, M.H., Stern, C.R., Farmer, L., 2010. Zircon U-Pb geochronology, Sr-Nd isotope analyses, and petrogenetic study of Dehnow diorite and Kuhsangi granodiorite (Paleo-tethys), NE Iran. Journal of Asian Earth Sciences, 37: 384-393.##
King, G. C. P., Stein, R. S., and Lin, J., 1994. Static stress changes and triggering of earthquakes. Bulletin of the Seismological Society of America, 84: 935-953.##
Koyi, H., Nilfouroushan, F. and Hessami, K., 2016. Modelling role of basement block rotation and strike-slip faulting on structural pattern in cover units of fold-and-thrust belts. Geological Magazine, 153(5-6): 827-844. doi: 0.1017/S0016756816000595##
Kozłowska, M., Orlecka-Sikora, B., Kwiatek, G., Boettcher, M.S., Dresen, G., 2015. Nanoseismicity and picoseismicity rate changes from static stress triggering caused by a Mw 2.2 earthquake in Mponeng gold mine, South Africa. Journal of Geophysical Research: Solid Earth, 120: 290-307.##
Lin, J., Stein, R.S., 2004. Stress triggering in thrust and subduction earthquakes, and stress interaction between the southern San Andreas and nearby thrust and strike-slip faults. Journal of Geophysical Research: Solid Earth, 109, B02303.
Lin, J., Stein, R.S., Meghraoui, M., Toda, S., Ayadi, A., Dorbath, C., Belabbes, S., 2011. Stress transfer among en echelon and opposing thrusts and tear faults: triggering caused by the 2003 Mw = 6.9##
Zemmouri, Algeria, earthquake. Journal of Geophysical Research: Solid Earth, 116, B03305.
Lyberis, N. and Manby, G., 1999. Oblique to orthogonal convergence across the Turan block in the post- Miocene. American Association of Petroleum Geologists Bulletin, 83(7): 1135-1160.##
Ma, K.F., Chan, C.H., 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, B05S19.
Masson, F., Anvari, M., Djamour, Y., Walpersdorf, A., Tavakoli, F., Daignières, M., Nankali, H., Van Gorp, S., 2007. Large-scale velocity field and strain tensor in Iran inferred from GPS measurements: new insight for the present-day deformation pattern within NE Iran. Geophysical Journal International, 170(1): 436-440.##
McCaffrey, R., 1991. Slip vectors and stretching of the Sumatran fore arc. Geology, 19(9): 881-884.##
McClusky, S., Reilinger, R., Mahmoud, S., Ben Sari, D., Tealeb, A., 2003. GPS constraints on Africa (Nubia) and Arabia plate motions. Geophysical Journal International, 155(1): 126-138.##
McKenzie, D., Jackson, J., 1986. A block model of distributed deformation by faulting. Journal of the Geological Society, 143(2): 349-353.##
Meier, M.-A., Werner, M.J., Woessner, J., Wiemer, S., 2014. A search for evidence of secondary static stress triggering during the 1992 Mw7.3 Landers, California, earthquake sequence. Journal of Geophysical Research: Solid Earth, 119. 2013JB010385.##
Mitsakaki, C., Rondoyanni, Th., Anastasiou, D., Papazissi, K., Marinou, A., Sakellariou, M., 2013. Static stress changes and fault interactions in Lefkada Island. Western Greece. Journal of
40 Nedaei & Alizadeh Geodynamics, 67: 53-61.##
Mogi, K., 1967. Regional variation in magnitude-frequency relation of earthquake. Bulletin of the Seismological Society of America, 45: 313-325.##
Motaghi, K., Tatar, M., Shomali, Z.H., Kaviani, A., Priestley, K., 2012. High resolution image of
uppermost mantle beneath NE Iran continental collision zone. Physics of the Earth and Planetary Interiors, 208-209: 38-49.##
Mousavi, Z., Walpersdorf, A., Walker, R.T., Tavakoli, F., Pathier, E., Nankali, H.R.E.A.,
Nilfouroushan, F., Djamour, Y., 2013. Global Positioning System constraints on the active tectonics of NE Iran and the South Caspian region. Earth and Planetary Science Letters, 377: 287-298.##
Naimi Ghassabian, N., Shaifi, H., Akbari Moghaddam, M., 2017. Report of earthquake MW 6.15
Sefidsang Mashhad 2017.04.05. Mashhad: Geological Survey of NE Iran, 73 pp.##
Natal'in, B.A., Sengӧr, A.M.C., 2005. Late Palaeozoic to Triasic evolution of the Turan and Scythian platforms: the pre-history of the Palaeo-Tethyan closure. Tectonophysics, 404: 175-202.##
Parsons, T., 2002. Global Omori law decay of triggered earthquakes: large aftershocks outside the classical Aftershock Zone. Journal of Geophysical Research: Solid Earth, 107.
Parsons, T., 2005. Significance of stress transfer in time-dependent earthquake probability calculations. Journal of Geophysical Research: Solid Earth, 110.
Parsons, T., Segou, M., Sevilgen, V., Milner, K., Field, E., Toda, S., Stein, R.S., 2014. Stress-based aftershock forecasts made within 24 h postmain shock: expected north San Francisco Bay area seismicity changes after the 2014 M = 6.0 West Napa earthquake. Geophysical Research Letters, 41: 8792-8799.##
Parsons, T., Stein, R.S., Simpson, R.W., Reasenberg, P.A., 1999. Stress sensitivity of fault seismicity: a comparison between limited-offset oblique and major strike-slip faults. Journal of Geophysical Research, 104: 20183-20202.##
Ruttner, A.W., 1991. Geology of the Aghdarband area (Kopet Dagh, NE-Iran). Abhandlungen der Geologischen Bundesanstalt, 38: 7-79.##
Sarkarinejad, K., Ansari, S., 2014. The Coulomb stress changes and seismicity rate due to the 1990 Mw 7.3 Rudbar earthquake. Bulletin of the Seismological Society of America, 104: 2943- 2952. Doi: 20130314##
Sarkarinejad, K., Ansari, S., 2015. Did the 1983 Charazeh earthquake trigger the 1990 destructive Rudbar earthquake? International Journal of Earth Sciences, 104: 309-319.##
Scholz, C.H., 1968. The frequency magnitude relation of microfracturing in rock and its relation to earthquakes. Bulletin of the Seismological Society of America, 58 (1): 399-415.##
Scholz, C. H., 1990. The Mechanics of Earthquakes and Faulting. Cambridge University Press, New York. Schorlemmer, D., Wiemer, S., 2005. Microseismicity data forecasts rupture area. Nature, 434, 1086.##
Schorlemmer, D., Wiemer, S., Wyss, M., 2004. Earthquake statistics at Parkfield: 1. Stationarity of b values. Journal of Geophysical Research, 109, B12307. doi: 10.1029/2004JB003234##
Sengör, A.M.C., 1984. The Cimmeride orogenic system and the tectonic of Eurasia. Geological Society of America Special Papers, 195, 82 pp.##
Shabanian, E., Bellier, O., Siame, L., Arnaud, N., Abbassi, M. R., Cochemé, J. J., 2009. New tectonic configuration in NE Iran: Active strike-slip faulting between the Kopeh Dagh and Binalud
mountains, Tectonics, 28, TC5002. Doi:
Sobiesiak, M., Meyer, U., Schmidt, S., Götze, H.-J., Krawczyk, C.M., 2007. Asperity generating upper crustal sources revealed by b value and isostatic residual anomaly grids in the area of Antofagasta, Chile. Journal of Geophysical Research, 112, B12308. Doi: 10.1029/2006JB004796##
Steacy, S., Gomberg, J., Cocco, M., 2005. Introduction to special section: stress transfer, earthquake triggering, and time-dependent seismic hazard. Journal of Geophysical Research, 110, B05S01. Doi: 2005JB003692.##
Stein, R., 1999. The role of stress transfer in earthquake occurrence. Nature, 402: 605-609.
Stein, R.S., Barka, A.A., Dieterich, J.H., 1997. Progressive failure on the North Anatolian fault since 1939 by earthquake static stress triggering. Geophysical Journal International, 128: 594-604.##
Stein, R. S., King, G. C. P., Lin, J., 1992. Change in failure stress on the southern San Andreas fault system caused by the 1992 magnitude = 7.4 Landers earthquake. Science, 258: 1328-1332##
Stein, R.S., King, G.C.P., Lin, J., 1994. Stress triggering of the 1994 M = 6.7 Northridge, California earthquake by its predecessors. Science, 265: 1432-1435.##
Stӧcklin, J., 1974. Possible ancient continental margins in Iran. In: Burke, C. and Drake, C. (Eds.), Geology of Continental Margins. Springer-Verlag New York, pp. 873-877.##
Su, Z., Yang, Y.H., Li, Y.S., Xu, X.W., Zhang, J., Zhou, X., Ren, J.J., Wang, E.C., Hu, J.C., Zhang,##
S.M., Talebian, M., 2018. Coseismic displacement of the 5 April 2017 Mashhad earthquake (Mw
6.1) in NE Iran through Sentinel-1A TOPS data: New implications for the strain partitioning in the southern Binalud Mountains. Journal of Asian Earth Sciences, 169: 244-256, Doi:
Sumy, D.F., Cochran, E.S., Keranen, K.M., Wei, M., 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: 1904-1923. http://dx.
Tchalenko, J.S., 1975. Seismicity and structure of the Kopet Dagh (Iran, USSR). Philosophical
Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 278
(1275): 1-28.##
Toda, S., 2008. Coulomb stresses imparted by the 25 March 2007 Mw =6.6 Noto-Hanto, Japan,
earthquake explain its ‘butterfly’ distribution of aftershocks and suggest a heightened seismic hazard Earth, Planets, Space, 60: 1041-1046.##
Toda, S., Lin, J., Meghraoui, M., Stein, R.S., 2008. 12 May 2008 M = 7.9 Wenchuan, China, earthquake calculated to increase failure stress and seismicity rate on three major fault systems. Geophysical Research Letters, 35, L17305.
Toda, S., Stein, R.S., Sevilgen, V., Lin, J., Coulomb 3.3 graphic-rich deformation and stress-change software for earthquake, tectonic, and volcano research and teaching-user guide. U.S. Geological Survey Open-File Report 2011-1060 (2011).##
Tormann, T., Wiemer, S., Hardebeck, J., 2012. Earthquake recurrence models fail when earthquakes fail to reset the stress field. Geophysical Research Letters, 39, L18310.
Tsapanos, T., 1990. b-value of two tectonic parts in the circum-Pacific belt, Pure and Applied
Geophysics, 143: 229-242.##
Urbancic, T. I., Trifu, C-I., Long, J. M., Young, R.P., 1992. Space-time correlation of b values with stress release, Pure and Applied Geophysics, 139 (3/4): 449-462.##
Ustu, T., 1965. A method in determining the value of b in a formula logn =a-bM showing the magnitude frequency for earthquakes. Geophysical Bulletin of Hokkaido University, 13: 99-103.##
Vernant, P., Nilforoushan, F., Hatzfeld, D., Abbassi, M.R., Vigny, C., Masson, F., Nankali, H.,
Martinod, J., Ashtiani, A., Bayer, R., Tavakoli, F., Chéry, J., 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.##
Walker, R., Jackson, J., 2004. Active tectonics and late Cenozoic strain distribution in central and eastern Iran. Tectonics, 23, TC5010. doi:10.1029/2003TC001529.##
Wang, J., Xu, C., Freymueller, J.T., Li, Z., Shen, W., 2014. Sensitivity of Coulomb stress change to the parameters of the Coulomb failure model: a case study using the 2008 Mw 7.9 Wenchuan earthquake. Journal of Geophysical Research: Solid Earth, 119. 60##
Wang, J.C., Shieh, C.F., Chang, T.M., 2003. Static stress changes as a triggering mechanism of a shallow earthquake: case study of the 1999 Chi-Chi (Taiwan) earthquake. Physics of the Earth and Planetary Interiors, 135: 17-25. Doi:
Wang, W.H., Chen, C.H., 2001. Static stress transferred by the 1999 Chi-Chi, Taiwan, earthquake: effects on the stability of the surrounding fault systems and aftershock triggering with a 3D fault-slip model. Bulletin of the Seismological Society of America, 91: 1041-1052.##
Wells, D. L., and Coppersmith, K. J., 1994. New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement. Bulletin of the Seismological Society of America, 84: 974-1002.##
Wiemer, S., 2001. A Software Package to Analyze Seismicity: ZMAP. Seismological Research Letters, 92: 373-382.##
Wiemer, S., Katsumata, K., 1999. Spatial variability of seismicity parameters in aftershock zones.Journal of Geophysical Research, 104 (13): 13,135-13,151.##
Wiemer, S., Wyss, M., 1997. Mapping the frequency-magnitude distribution in asperities: An improved technique to calculate recurrence times? Journal of Geophysical Research, 102: 15,115-15,128.##
Wiemer, S., Wyss, M., 2000. Minimum magnitude of completeness in earthquake catalogs: examples from Alaska, the Western United States, and Japan. Bulletin of the Seismological Society of America, 90: 859-869.##
Wyss, M., 1973. Towards a physical understanding of the earthquake frequency distribution.
Geophysical Journal of the Royal Astronomical Society, 31: 341-359.##
Wyss, M., Klein, F., Nagamine, K., Wiemer, S., 2001. Anomalously high b values in the South Flank of Kilauea volcano, Hawaii: evidence for the distribution of magma below Kilauea’s East rift zone. Journal of Volcanology and Geothermal Research, 106: 23-37.##
Xie, C., Lei, X., Wu, X., Hu, X., 2014. Short- and long-term earthquake triggering along the strike-slip Kunlun fault, China: insights gained from the Ms 8.1 Kunlun earthquake and other modern large earthquakes. Tectonophysics, 617: 114-125.##
Yadav, R.B.S., Gahalaut, V.K., Chopra, S., Shan, B., 2012. Tectonic implications and seismicity
triggering during the 2008 Baluchistan, Pakistan earthquake sequence. Journal of Asian Earth
Sciences, 45: 167-178.##
Zanchetta, S., Berra, F., Zanchi, A., Bergomi, M., Caridroit, M., Nicora, A., Heidarzadeh, G., 2013. The record of the Late Palaeozoic active margin of the Palaeotethys in NE Iran: Constraints on the Cimmerian orogeny. Gondwana Research, 24: 1237-1266.##