关于阿尔金断裂错动速率研究的综述及其启示

A Review of Slip Rates Along the Altyn Tagh Fault and Its Implications

阿尔金断裂是中国大陆内部一条重要断裂带,对理解青藏高原的隆升演化和大陆构造变形过程均有重要意义,其滑动速率的争议也成为理解这一问题的关键。本文汇总了近年来关于阿尔金断裂滑动速率绝大部分究成果,包含了82°E^99°E范围内来自一般地质学、古地震和大地测量的结果,覆盖了几十年、千年和万年以上的时间尺度和整个阿尔金断裂带,形成对阿尔金断裂带滑动速率的时空变化特征的全面认识,迄今为止的研究结果均支持阿尔金断裂中西段具有(10±3)mm/a的滑动速率,自约93°E向东逐渐衰减,且随时间变化不大,由于测量方法导致的差异可能与一次大地震或地震高发期有关。

The Altyn Tagh Fault,as an important fault within the Chinese continent,plays a key role in understanding the uplift evolution of the Tibetan Plateau and the continental deformation process,in which the slip rates has been the most crucial issues in different views.We collect most of the slip rate results of the Altyn Tagh Fault by previous studies,including geologic,paleoseismic,and geodetic estimations ranging in 82°E^99°E,which span decadal,millennial,and tens-of-thousand-years temporal scales,which allow us to obtain an overall perspective on the spatial-temporal variation of the slip rates along the Altyn Tagh Fault.Recent investigations suggest a(10±3)mm/a strike-slip rate across the western and central segments,and a eastward decrease along the eastern segment starting from 93°E,with insignificant temporal variation.And we attribute the discrepancy between results from different measurements to either a single large event or a group of temporally clustered earthquakes.