Oblique Collision in the Northern Zagros Observed by GPS
سال انتشار: 1384
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 124
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شناسه ملی سند علمی:
JR_JSEE-7-3_003
تاریخ نمایه سازی: 14 آبان 1400
چکیده مقاله:
The total Arabia-Eurasia collision with ۲۲mm/yr of shortening is absorbed on the Iranian territory mainly in two mountain belts, the Zagros and the Alborz, and on a few large strike-slip faults. Our study focuses on the northern part of the Zagros (west of the NS trending Kazerun fault system), that has been covered by an ۱۸ site GPS network measured in ۲۰۰۱ and ۲۰۰۳. In northern Zagros, shortening is oblique to the mountain belt and partitioning of the deformation on strike-slip and thrust faults could be expected. An example is the pure strike-slip earthquake of magnitude ۷.۴ on the Main Recent Fault, the major strike-slip fault in northern Zagros, close to Dorud in ۱۹۰۹. Our precise velocities of bedrock sites with forced antenna centring show that ۳-۶ mm/yr of shortening is occurring in northern Zagros perpendicular to the mountain belt axis, with a total dextral strike-slip component of ۴-۶mm/yr. A part of this strike-slip motion is found on the Main Recent Fault. The detailed GPS velocity field indicates that the deformation is not completely distributed but can be attributed to some individual faults. However, there is no clear evidence of partitioning. This result will be compared with GPS studies of the central Zagros, where the major deformation mechanism is axis perpendicular shortening with ۸mm/yr.
کلیدواژه ها:
Global Positioning System (GPS) ، Satellite Geodesy ، Continental Deformation ، Plate Convergence ، Fault Motion ، Zagros
نویسندگان
A. Walpersdorf
Laboratoire de Géophysique Interne et Tectonophysique, Maison des Géosciences
H.R. Nankali
National Cartographic Center, Tehran
F. Tavakoli
National Cartographic Center, Tehran
M. Tatar
IIEES
D. Hatzfeld
Laboratoire de Géophysique Interne et Tectonophysique, Maison des Géosciences
P. Vernant
Laboratoire de Dynamique de la Litosphère
J. Chéry
Laboratoire de Dynamique de la Lithosphere, CNRS/Universite de Montpellier II