INVESTIGATION OF THE MECHANISM AND NEOTECTONICS OF THE SIAH CHESHMEH- KHOY FAULT ZONE

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ROUSTAEE M.; ZAMANI B.; NAVABPOUR P.; MOAYYED M.

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Journal: GEOSCIENCES Year:2015 | Volume:24 | Issue:96 Page(s): 221-234

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Title

INVESTIGATION OF THE MECHANISM AND NEOTECTONICS OF THE SIAH CHESHMEH- KHOY FAULT ZONE

Author(s)

ROUSTAEE M. | ZAMANI B. | NAVABPOUR P. | MOAYYED M. | Issue Writer Certificate

Keywords

NEOTECTONICSQ2

INVERSION METHODQ2

SIAH CHESHMEHQ2

KHOYQ2

NW IRANQ2

Abstract

The SIAH CHESHMEH-Khoy fault system is one of the principal faults in NW of Iran, and a right-lateral strike-slip activity has been reported for its different segments. Landsat 7 satellite images of the area confirm the right-lateral strike-slip motion of this fault system, where deflected drainages of large rivers and displaced alluvial fans can be detected across the segments of the fault zone. The amount of alluvial fans displacement in Dasht-e-Zurabad (along a segment of the Kamarkassan fault) was estimated to be nearly 1.8 km. In this research, the NEOTECTONICS and mechanism of the SIAH CHESHMEH-Khoy fault zone has been studied by “inversion method” and based on the combination of focal mechanisms of earthquakes and field observations. Therefore, we have utilized all of the existing focal mechanism solutions of the earthquakes occurred in this area. In addition, the data measured in the field surveys include shear planes having slickenlines and the fault planes related to the SIAH CHESHMEH-Khoy fault zone. These data were gathered from 7 sites, where 45 shear planes with slickenlines were measured in the young rock units. At first, the principal stress axes were obtained in all sites by INVERSION METHOD, then stress state and NEOTECTONICS of the region was evaluated using combination of focal mechanisms of earthquakes and the measured field data. The results obtained from this analysis indicate a dominant strike-slip mechanism with its compression axis along NNW-SSE (N162o) direction and extension axis aligned in ESE-WNW (N255o) direction. It can be stated that the mentioned stress regime was the main factor in controlling the seismicity of this area as indicated by recorded earthquakes. Also, the right-lateral strike-slip motion of the SIAH CHESHMEH-Khoy fault segments is affected by this stress regime. The results of this research are also compatible with the geodetic and GPS results done by other researches in the region.

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APA: Copy

ROUSTAEE, M., ZAMANI, B., NAVABPOUR, P., & MOAYYED, M.. (2015). INVESTIGATION OF THE MECHANISM AND NEOTECTONICS OF THE SIAH CHESHMEH- KHOY FAULT ZONE. GEOSCIENCES, 24(96), 221-234. SID. https://sid.ir/paper/32488/en

Vancouver: Copy

ROUSTAEE M., ZAMANI B., NAVABPOUR P., MOAYYED M.. INVESTIGATION OF THE MECHANISM AND NEOTECTONICS OF THE SIAH CHESHMEH- KHOY FAULT ZONE. GEOSCIENCES[Internet]. 2015;24(96):221-234. Available from: https://sid.ir/paper/32488/en

IEEE: Copy

M. ROUSTAEE, B. ZAMANI, P. NAVABPOUR, and M. MOAYYED, “INVESTIGATION OF THE MECHANISM AND NEOTECTONICS OF THE SIAH CHESHMEH- KHOY FAULT ZONE,” GEOSCIENCES, vol. 24, no. 96, pp. 221–234, 2015, [Online]. Available: https://sid.ir/paper/32488/en

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