Heat Flow and Thermal Structure of the Cascadia Subduction Zone

覆盖俯冲带的岩石圈块体的热结构复杂多样，地表热流值从地球上最高的区域到最低的区域不等。在过去的15年里，人们对美国太平洋西北部卡斯卡迪亚俯冲带的热特征进行了广泛的研究，特别是关于级联火山弧的地热潜力。作为这些研究的一个附带结果，也收集了一些低热流外弧块体的数据。作为该项目的主要目标，这些数据将用于建立俯冲带和外弧块随时间变化的三维温度模型。这一温度模型将被用作评估该带的力学特征的基础，以此来研究大俯冲带型地震的可能性，并探索卡斯卡迪亚俯冲作为该带没有深源地震的原因的独特背景。

The thermal structure of the lithosphere block overriding a subduction zone is complicated and diverse with surface heat flow values ranging from the highest to the lowest regional values on the earth. The thermal characteristics of the Cascadia subduction zone in the Pacific Northwest of the United States have been extensively studied during the last 15 years, especially as regards the geothermal potential of the Cascade volcanic arc. As a side result of these studies some data has been collected in the low heat flow outer arc block as well. As the primary objective of the project these data will be used to develop a time-dependent three-dimensional temperature model of the subduction zone and the outer arc block. This temperature model will be used as a basis for evaluating the mechanical characteristics of the zone as a way to investigate the potential for large subduction zone type earthquakes and to explore the unique setting of the Cascadia subduction as the reason that no deep focus earthquakes are associated with the zone.