SEISMOTECTONICS OF SAHNEH FAULT, MIDDLE SEGMENT OF MAIN RECENT FAULT, ZAGROS MOUNTAINS, WESTERN IRAN

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MIRZAEI N.; GHEYTANCHI M.R.

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Journal Paper

Paper Information

Journal: Journal of the Earth and Space Physics Year:2002 | Volume:28 | Issue:2 Page(s): 1-8

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Title

SEISMOTECTONICS OF SAHNEH FAULT, MIDDLE SEGMENT OF MAIN RECENT FAULT, ZAGROS MOUNTAINS, WESTERN IRAN

Author(s)

MIRZAEI N. | GHEYTANCHI M.R. | Issue Writer Certificate

Keywords

MAIN RECENT FAULT

MICROSEISMICITY

ZAGROS

SAHNEH FAULT

SEISMOTECTONICS

Abstract

A detailed mapping and short-term micro earthquake survey in a small region covering the SAHNEH FAULT segment of the MAIN RECENT FAULT of the ZAGROS Mountains, in western Iran, is conducted to study the SEISMOTECTONICS of the SAHNEH FAULT. It is found that the SAHNEH FAULT is an active second order structure of the transpression (positive flower structure) type with temporarily low level of seismic activity. Meizoseismal regions of historical earthquakes, macroseismic epicenters of pre-instrumental (1900-1963) earthquakes, as well as the location of microearthquakes together with the structural geology of the region, strongly suggest that the study region should be considered as a localizing structure, so that the seismic activity of the region cannot reliably be correlated to any known active faults. Present microseismic activity is concentrated in the area bounded by the southern part of the SAHNEH FAULT and the northern elongation of the Nahavand fault, that covers the meizoseismal regions of the Farsinaj earthquake of 13 December 1957 (Ms=6.7). Focal mechanism of earthquakes and structural analysis confirms the prominent right-lateral strike-slip deformation along the SAHNEH FAULT. This is consistent with relative motion between the Arabian Plate and the Central Iran Microcontinent. Hypocenters of earthquakes recorded from August to September 1998, by the local seismic network, show that earthquakes in this region originate mainly in depths of about 10 km.

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APA: Copy

MIRZAEI, N., & GHEYTANCHI, M.R.. (2002). SEISMOTECTONICS OF SAHNEH FAULT, MIDDLE SEGMENT OF MAIN RECENT FAULT, ZAGROS MOUNTAINS, WESTERN IRAN. JOURNAL OF THE EARTH AND SPACE PHYSICS, 28(2), 1-8. SID. https://sid.ir/paper/529554/en

Vancouver: Copy

MIRZAEI N., GHEYTANCHI M.R.. SEISMOTECTONICS OF SAHNEH FAULT, MIDDLE SEGMENT OF MAIN RECENT FAULT, ZAGROS MOUNTAINS, WESTERN IRAN. JOURNAL OF THE EARTH AND SPACE PHYSICS[Internet]. 2002;28(2):1-8. Available from: https://sid.ir/paper/529554/en

IEEE: Copy

N. MIRZAEI, and M.R. GHEYTANCHI, “SEISMOTECTONICS OF SAHNEH FAULT, MIDDLE SEGMENT OF MAIN RECENT FAULT, ZAGROS MOUNTAINS, WESTERN IRAN,” JOURNAL OF THE EARTH AND SPACE PHYSICS, vol. 28, no. 2, pp. 1–8, 2002, [Online]. Available: https://sid.ir/paper/529554/en

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