Collaborative Research: High Resolution Multichannel Seismic Imaging of Active Tectonics, Northwest Gulf of California

资金用于对加利福尼亚州海湾西北部的一个构造活动区进行高分辨率多通道地震调查。加利福尼亚州海湾是少数几个可以在倾斜延伸区研究大陆向海洋过渡地壳的可接近地区之一。由于缺乏更深入的了解，该地区的大多数模型显示的是单一的、简单的板块边界。两种端元模型是可能的：广泛活动带中的扩散变形和海湾北部两个独立带中的局部滑动。区分这两种模式的关键在于加利福尼亚州浅水湾。PIS将使用墨西哥科考船上的LDEO便携式高分辨率MCS系统获得活动构造的地震反射剖面，并用声纳浮标反射剖面增强以成像年轻断层、变换断层和扩张中心。模拟将量化当前板块运动和应变分配的运动学估计，并导致理解从陆缘系统向海洋系统过渡期间的STEKSIP和裂谷段的组织。

Funds are provided for a high-resolution multi-channel seismic survey of a tectonically active area in northwestern Gulf of California. The Gulf of California is one of the very few accessible areas where the transitional crust from continent to ocean can be studied in a region of oblique extension. Most models of the region show a single, simple plate boundary, due to lack of deeper understanding. Two end-member models are possible: diffuse deformation in a broad active zone, and localized slip in two separate zones in the northern Gulf. The key to discriminating between the two models lies in the shallow Gulf of California. The PIs will use the LDEO portable high resolution MCS system on a Mexican research vessel to obtain seismic reflection profiles of active tectonics, augmented wth sonobuoy reflection profiles to image the young faults, transform faults and the spreading center. Modeling will quantify estimates of kinematics of the current plate motions and strain partitioning and lead to an understanding of the organization of the stike-slip and rift segments during transition from a contiental to an oceanic system.