本文利用断层面解、原地应力测量和新生代地质资料来推断美国西部的现代构造状态。所提出的重要问题是关于现代断层作用与地震活动性的时空关系、火山作用的时间关系和区域上升的速率等。因为地震活动性只反映现代的变形,所以某些困难继续存在。这里的资料从板块构造的格架内反映新生代的变形模式,它是由法腊隆板块向东俯冲到美国西部之下,随后地幔发生底辟作用和上升引起的。作者假定,继这种状态之后有西部内侧的西北向拉张,这是受圣安德烈斯断层相平 In this paper, the fault structure, in-situ stress measurements and Cenozoic geological data are used to infer the modern tectonics in the western United States. The important issues raised are the temporal and spatial relationships between modern fault activity and seismicity, the time relationship of volcanism and the rate of regional rise. Because seismicity reflects only modern deformation, some difficulties persist. The data presented here reflect the Cenozoic deformation pattern from the tectonic plate tectonic plateau, which is subducted eastward by the Farah plate beneath the western United States, followed by diapirism and uplift of the mantle. The authors assume that following this state there is a northwesterly extension of the western part of the west, which is plagued by the San Andreas fault