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

合作研究：加利福尼亚湾西北部活动构造的高分辨率多通道地震成像

• 批准号: 9730790
• 负责人: Joann Stock
• 金额: $ 19万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9730790&HistoricalAwards=false
• 关键词: Collaborative; Research; Resolution; Multichannel; Seismic

Funds are provided for a high-resolution multi-channel seismic survey of 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 estension. 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 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 with sonobuoy refraction 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 strike-slip and rift segments during transition from a continental to an oceanic system.

为加州湾西北部构造活动区的高分辨率多道地震勘探提供了资金。 加州湾是极少数可以在斜向伸展区域研究大陆向海洋过渡地壳的地区之一。 由于缺乏更深入的了解，该地区的大多数模型都显示出单一、简单的板块边界。 两个端元模型是可能的：在一个广泛的活动区的扩散变形，并在两个独立的区域在北方海湾的局部滑动。 区分这两种模式的关键在于加州湾的浅水区。 PI将使用墨西哥研究船上的LDEO便携式高分辨率MCS系统，以获得活动构造的地震反射剖面，并增加声纳浮标折射剖面，以成像年轻断层，转换断层和扩展中心。 建模将量化目前的板块运动和应变分区的运动学估计，并导致从大陆到海洋系统过渡期间的走滑和裂谷段的组织的理解。