Collaborative Research: A community seismic experiment targeting the pre-, syn-, and post-rift evolution of the Mid Atlantic US margin

合作研究：针对美国大西洋中部边缘裂谷前、同裂谷和裂谷后演化的社区地震实验

• 批准号: 1348454
• 负责人: Harm Van Avendonk
• 金额: $ 15.94万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1348454&HistoricalAwards=false
• 关键词: Collaborative; Research; community; seismic; experiment

The structure and evolution of the Eastern North America margin are the focus of this GeoPRISMS community seismic experiment. The data obtained will form a fundamental framework to address several aspects of the Program's Rift Initiation and Evolution initiative: how tectonic, magmatic, erosional and depositional processes interact; the role of mantle dynamics in ongoing deformation along this passive margin; the impact of ancient regional structure on long-term evolution that shapes present-day distribution of geologic activity. A year-long ocean bottom seismometer array (OBSIP- 30 instruments) will extend onshore station coverage (EarthScope Transportable Array, ~30 sites relevant) across Cape Hatteras. Additional transects of densely-spaced seismometers will record seismic waves that travel across the coastline, documenting more detailed structure from the continental slope through the coastal plain. Multi-channel seismic reflection data will be openly available upon completion of a training workshop that will conduct basic processing. Similarly, seismic refraction data will be distributed for a second training workshop. Data for investigations using natural seismic events will also be openly available via the IRIS Data Management Center. Station spacing and array aperture target crust and upper mantle imaging. The experiment design builds on existing data to address current scientific questions, emphasizing both deeper structure, which will illuminate driving forces for ongoing evolution, and modernizing shallow structural constraints, to better document surface response records and their relationship to the history of glacial, sea level, depositional, and magmatic loading.

北美东部边缘的结构和演化是本次GeoPRISMS群落地震实验的重点。获得的数据将形成一个基本框架，以解决该计划的裂谷起始和演化倡议的几个方面：构造、岩浆、侵蚀和沉积过程如何相互作用；地幔动力学在沿这一被动边缘的持续变形中的作用；古代区域结构对形成当今地质活动分布的长期演化的影响。长达一年的海底地震仪阵列（OBSIP-30 仪器）将扩大哈特拉斯角的陆上台站覆盖范围（EarthScope 可移动阵列，约 30 个相关站点）。密集分布的地震仪的额外横断面将记录穿过海岸线的地震波，记录从大陆坡到沿海平原的更详细的结构。在完成基本处理的培训研讨会后，多道地震反射数据将公开提供。同样，将为第二次培训研讨会分发地震折射数据。使用自然地震事件进行调查的数据也将通过 IRIS 数据管理中心公开提供。站间距和阵列孔径目标地壳和上地幔成像。 实验设计基于现有数据来解决当前的科学问题，强调更深层次的结构，这将阐明持续进化的驱动力，并现代化浅层结构约束，以更好地记录表面响应记录及其与冰川、海平面历史的关系、沉积和岩浆负荷。