New constraints on Quaternary slip partitioning near the eastern termination of the Altyn Tagh Fault
New constraints on Quaternary slip partitioning near the eastern termination of the Altyn Tagh Fault
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DOI：
10.5194/egusphere-egu21-12517
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
Nimrod Wieler;A. Mushkin;Huiping Zhang;E. Shelef;A. Sagy;Z. Ren;F. Huang;Jinrui Liu;P. Shi
中科院分区：
文献类型：
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作者：
Nimrod Wieler;A. Mushkin;Huiping Zhang;E. Shelef;A. Sagy;Z. Ren;F. Huang;Jinrui Liu;P. Shi
沿青藏高原北方边界沿着的滑动划分对于理解区域形变和容纳它的不同断层的地震潜力是必不可少的。在这个框架内，阿尔金断层（ATF）通常被认为是将青藏高原与北部稳定的戈比-阿拉善地块分开的主要构造。在86° E和93°E之间的ATF中部，晚第四纪左旋滑动速率为8-12 mm/年，随着断层接近其在97°E附近的大陆中部终止点，向东减小至零。为了更好地了解晚第四纪滑动是如何沿着ATF的东部终端划分的，我们获得了位于ATF以北约60 km，东经94°-96 ° E之间，靠近敦煌镇的约200 km长的左旋ENE走向的三危山断裂（SSF）的新滑动速率测量结果。
Slip partitioning along the northern boundary of the Tibetan Plateau is essential for understanding regional deformation and the seismic potential of the different faults that accommodate it. Within this framework the Altyn Tagh Fault (ATF) is commonly viewed as the primary structure that separates the Tibetan Plateau from the stable Gobi-Alashan block to the north. Late Quaternary sinistral slip rates of 8-12 mm/yr across the central ATF between 86° and 93°E decrease eastwards to zero as the fault approaches its mid-continental termination at ~97°E. To better understand how late Quaternary slip is partitioned along the ATF’s eastern termination we obtained new sliprate measurements for the ~200-km-long left-lateral ENE striking Sanweishan Fault (SSF) located ~60 km north of the ATF between 94°-96°E near the town of Dunhuang.