Structural Analysis of the Western Part of Shotori Mountain Range; Eastern Iran

  • سال انتشار: 1401
  • محل انتشار: فصلنامه زلزله شناسی و مهندسی زلزله، دوره: 24، شماره: 1
  • کد COI اختصاصی: JR_JSEE-24-1_001
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 182
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نویسندگان

Razieh Abbaspour

Department of Geology, University of Birjand, Birjand, Iran

Ahmad Rashidi

Department of Earthquake Research, Shahid Bahonar University of Kerman, Kerman, Iran; & International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

Seyed Morteza Mousavi

Department of Geology, University of Birjand, Birjand, Iran

Shahram Shafieibafti

Department of Geology, Shahid Bahonar University of Kerman, Kerman, Iran

Majid Nemati

Department of Geology, Shahid Bahonar University of Kerman

Reza Derakhshani

Department of Geology, Shahid Bahonar University of Kerman, Kerman, Iran

چکیده

NW-SE trending Shotori range has some structural elements such as folds and fractures (including thrust and strike-slip faults), following almost a similar trend. Based on the plotted stereograms, the predominant mechanism of the region’s faults is thrust with a dextral strike slip component which implies overcoming compressive stresses in the region. On the other hand the strike-slip horizontal component of the faults may also be due to the Nayband fault activities on Shotori and Esfandiar thrust zones. The steep dip of these faults may also be due to some normal faults converted to reverse faults as a result of stress phase change from tensional to compressional. Based on planar axis perpendicular compression or stretching axis σ۱= ۳۴, ۱۰ and σ۳= ۲۹۶, ۳۸ were obtained for the study area. striogram axial surface folds  dominantly show  NW-SE direction, which is indicates  compression axis which is equal N۵۳, ۱۲.Aeromagnetic data analysis revealed two magnetic lineaments with the same trends as surveyed lineaments in the field. The relatively high magnetic intensity of these lineaments could be due to basement faults in the region. With regards to obtained stereo plots, trend of the folds’ axis are parallel to the regional thrust faults and folds’ contour diagrams apply asymmetric folds with faulting in the area.

کلیدواژه ها

Structural analysis, Shotori mountain range, Fault zone, Aeromagnetic data analysis

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