Late Quaternary Crustal Deformation Along the Cascadia Subduction Zone in Southern and Central Coastal Oregon

研究目标如下：（1）绘制海洋 在四个领域的梯田，至少有四个航班的 海洋阶地存在;（2）建立数字年龄 通过从梯田收集可确定数据的材料， （3）研究海洋阶地的土壤发育， 识别土壤时间序列和土壤时间函数， 根据土壤发育情况将梯田联系起来，并调查 计算机模拟模型的分配能力 海蚀阶地的年代学研究;（4）阶地的对比研究 研究地点之间的差异;（5）分析晚第四纪 变形 最后一个目标需要汇编绝对 不同地点的变形量， 隆升、倾斜和断层滑动速率， 变形被分割成结构域的程度 沿着海岸。 我们预计我们将成功地分配 至少有一个或两个较低的阶地在每个数字年龄 研究中心。 如果土壤发育模拟模型是 如果可行，那么所有阶地的数字年龄是可能的。 迄今为止的绘图（如下所述）表明， 沿着俄勒冈州的南部海岸在空间上或 时间，而是海岸被分割成广泛的扭曲。 故障 与这些大的弯曲有关， 似乎是结构片段的边界。 所以我们 我还预计我们将能够识别构造 具有不同海岸线长度、面积和 变形速率（或速率范围）。 两者的长度 段和相对年龄的变形在这些 各部分应作为确定《公约》各部分的基础， 不同特征的构造响应海岸 俯冲

Research objectives are the following: (1) to map marine terraces in four field areas where at least four flights of marine terraces are present; (2) to establish numerical ages of terraces through collection of datable material form terrace deposits; (3) to study soil development on marine terraces for identifying soil chronosequences and soil chronofunctions, correlating terraces based on soil development, and investigating capabilities of a computer-simulation model for assigning numerical ages to marine terraces; (4) to correlate terraces among study sites; and (5) to analyze late Quaternary deformation. The last objective entails compilation of absolute magnitudes of deformation at the different sites, compilation of uplift, tilt and fault-slip rates, and determination of the extent to which deformation is segmented into structural domains along the coast. We anticipate that we will be successful in assigning numerical ages to at least the lower one or two terraces at each study site. If the soil development simulation model is feasible, then numerical ages of all terraces are a possibility. Mapping to date (described below) demonstrates that deformation along the southern coast of Oregon is not uniform in space or in time, but rather the coast is segmented into broad warps. Faults are associated with these broad warps, and some of these faults appear to be boundaries of structural segments. Therefore, we also anticipate that we will be able to identify tectonic segments that have different coastline lengths, areas, and deformation rates (or ranges of rates). Both the lengths of segments and the relative ages of deformation within these segments should serve as a basis for identifying segments of the coast with different characteristic tectonic responses to subduction.