Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

The first paleoseismological research on the Dorud fault: insights from the Darb Astana trench, southwestern Iran

Document Type : Original Research Paper

Authors
Zahra Kamali 1, 2
Hamid Nazari 3
Syrus Esmaili 4
Mahmoud Reza Hayhat 1
1 Department of Geology, Faculty of Sciences, University of Birjand, Birjand, Iran
2 Geological Survey of Iran, Khorram Abad, Iran
3 Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran
4 Geological Survey of Iran, Tabriz, Iran
10.22071/gsj.2025.501250.2177
Abstract
The Dorud fault is a key seismic segment of the young Zagros fault, stretching northwest-southeast from the Arjang area to Borujerd. This study examines the latest tectonic movements, young tectonic phenomena, and paleoseismology of the Dorud segment near Darb Astaneh village in eastern Dorud county. To achieve this, a 45-meter trench was dug in the NE-SW direction across the Dorud fault zone, revealing 9 paleo seismic events on the trench's eastern wall. These earthquakes had magnitudes ranging from 6.6 to 7.4 and a mean return period of approximately 104 ± 7 years. The findings suggest that large earthquakes triggered by the Dorud fault can produce magnitudes up to 7.4, surface ruptures of around 45 km, and slips of up to 3.83 ± 0.1 m per event, consistent with the EvI′, EvII′, and 1909 events attributed to repeated fault movement.
Keywords
Main recent fault
Trench
Dorud fault
Paleoseismology

Subjects

Agard, P., Omrani, J., Jolivet, L., Whitechurch, H., Vrielynck, B., Spakman, W., Monie, P., Meyer. B., and Wortel, R., 2011. Zagros orogeny: a subduction-dominated process, Geology Magazine 1-34, http://dx.doi.org/10.1017/S001675681100046X.
Ambraseys, N. N., and Melville, C. P, A., 1982. History of Persian earthquakes. Cambridge University Press, London, 219.
Ambraseys, N.N., 2001. Reassessment of Earthquakes, 1900-1999, in the Eastern Mediterranean and the middle Esat. Geophysics Journal International. 145, 471-485, https://doi.org/10.1046/j.0956-540x.2001.01396.x.
Bachmanov, D.M., Trifonov, V.G., Hessami, Kh. T., Kozhurin, T.P., Rogozhin, E.A., Hademi, M.C., and Jamali, F.H., 2004. Active faults in the Zagros and central Iran, Tectenophysics 380: 221-241, http://dx.doi.org/10.1016/j.tecto.2003.09.021.
Berberian, M., 1995. Master "blind'' thrust faults hidden under the Zagros folds: active basement tectonics and surface morphotectonics, Tectonophysics241:193- 224, https://doi.org/10.1016/0040-1951(94)00185-C.
Berberian, M., 2014. Earthquakes and coseismic active faulting on the Iranian. Developments in earth surface processes, 17, 616, eBook ISBN: 9780444632975.
Global CMT Web Page. https://www.globalcmt.org/
Hanks, T. C., and Kanamori., H., 1979. A moment magnitude scale. Geophysics Resarch., 84, 2348-2350, https://doi.org/10.1029/JB084iB05p02348.
Hessami, K., 2001. Active Faults Map in Iran, International Seismology and Earthquake Engineering Institute, Tehran.
Kamali, Z., Nazari, H., Rashidi, A., Heyhat, M, R., Khatib, M.M., and Derakhshani, R., 2023. Seismotectonics, Geomorphology and Paleoseismology of the Doroud Fault, a Source of Seismic Hazard in Zagros. Applied Sciences. 13 (6), 1-20. https://doi.org/10.3390/app13063747.
Kim, Y. S., and Anderson, D. J., 2005. The relationship between displacement and length of faults: a review. Earth-Science Reviews, 68, 317–334, https://doi.org/10.1016/j.earscirev.2004.06.003.
Malekzade, Z., Abbassi, M.R., Bellier, O., and Authemayou, C., 2007. Strain Partitioning in West-Central Zagros Fold and Thrust Belt: implication for Seismic Hazard Analysis, Journal of Seismology and Earthquake Engineering 9: 85–98, https://www.jsee.ir/article_240555.html.
McCalpin, J.P., 2009. Paleoseismology. Academic Press Inc., Elsevier Inc., 2nd ed, 613, eBook ISBN: 9780080919980.
McCalpin, J.P., and Nishenko, S.P., 1996. Holocene paleoseismicity, temporal clustering, and probabilities of future large(M>7) earthquakes on the Wasatch fault zone, Utah: Journal of Geophysical Rasrarch, V.101, no. B3, p.6233-6253, doi: 10.1029/95JB02851.
Mirzaei, N., 2003. The most recent period of seismic activity in Dinavar segment of Main Recent Fault, Zagros mountains of western Iran, IUGG 2003, Suppro, Japan, Abstracts, P.B466.
Ni, J. and Barazangi, M., 1986. Seismotectonics of the Zagros continental collision zone and a comparison with the Himalayas. Journal of Geophysical Research 91: doi: 10.1029/JB091iB08p08205. issn: 0148-0227.
Peyret, M., Rolandone, F., Dominguez, S., Djamour, Y., and Meyer, B., 2008. Source model for the Mw 6.1, 31 March 2006, Chalan-Chulan Earthquake (Iran) from InSAR. Terra Nova 20, (2), 126–133, http://dx.doi.org/10.1111/j.1365-3121.2008.00797.x.
Sepahvand, M. R., Yaminifard, F., Tatar, M., and Abbassi, M. R., 2012. Aftershocks study of the 2006 Silakhur earthquake (Zagros, Iran): seismological evidences for a pull-apart basin along the Main Recent Fault, Doroud segments. Journal Seismology, 16, 233–251, http://dx.doi.org/10.1007/s10950-011-9266-3.
Sieh, K., Stuiver, M., and Brillinger, D., 1989. A more precise chronology of earthquakes produced by the San Andreas fault on Southern California, Journal of Geophysical Research, 94, 603-623, https://doi.org/10.1029/JB094iB01p00603.
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: 506-526, http://dx.doi.org/10.1111/j.1365-246X.2004.02092.x.
Tchalenko, J. S., and Braud, J., 1974. Seismicity and structure of the Zagros (Iran): the Main Recent Fault between 33° and 35°N", Philosophical Transactions of the Royal Society of London, 227, 1-25, https://doi.org/10.1098/rsta.1974.0044.
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, https://doi.org/10.1785/BSSA0840040974.
Scientific Quarterly Journal of Geosciences
Volume 35, Issue 2 - Serial Number 136
Summer 2025, vol. 35, Issue 2, Serial no. 136
Spring 2025
Pages 123-144