Distribution of the right-lateral strike-slip motion from the Main Recent Fault to the Kazerun Fault System (Zagros, Iran): Evidence from present-day GPS velocities

被引:72
|
作者
Tavakoli, F. [1 ,2 ]
Walpersdorf, A. [1 ]
Authemayou, C. [3 ,5 ]
Nankali, H. R. [2 ]
Hatzfeld, D. [1 ]
Tatar, M. [4 ]
Djamour, Y. [2 ]
Nilforoushan, F. [2 ]
Cotte, N. [1 ]
机构
[1] Univ Grenoble 1, CNRS, INSU, Lab Geophys Interne & Tectonophys,UMR 5559, F-38041 Grenoble 9, France
[2] Natl Cartog Ctr, Tehran, Iran
[3] Univ Aix Marseille 3, CNRS, CEREGE, F-13545 Aix En Provence 4, France
[4] Int Inst Earthquake Engn & Seismol, Tehran, Iran
[5] Univ Lausanne, Inst Paleontol & Geol, CH-1015 Lausanne, Switzerland
关键词
GPS; Iran; Zagros; fault slip rates;
D O I
10.1016/j.epsl.2008.08.030
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
GPS measurements across the Kazerun Fault System in the Zagros mountain belt provide first instantaneous velocities on the different segments. These results are closely consistent with the geological fault slip rates (over 150 ka), implying stable velocities over a longer period. The present-day strike-slip motion is distributed from the Main Recent Fault to the N-trending Kazerun Fault System along a preferential enechelon fault zone included in a more distributed fan-shape fault pattern. The Hormuz salt decoupling layer cannot be the only cause of a sedimentary spreading because seismicity attests these faults are rooted in the basement. The Dena fault (3.7 mm/yr) transfers the MRF fault slip mainly to the Kazerun (3.6 mm/yr) and slightly to the High Zagros and Sabz Pushan faults (1.5 mm/yr), and the Kazerun fault further to the Kareh Bas fault (3.4 mm/yr). Total geological horizontal offsets associated with GPS slip rates help inferring precise fault slip onset ages. The successive onsets deduced by this approach imply that the right-lateral strike-slip activity of the MRF has propagated in time southeastward to the Dena segment, and then to the Kazerun segment and to the Kareh Bas fault. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:342 / 347
页数:6
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