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变是该地理主义社区地震实验的重点。获得的数据将构成一个基本框架，以解决该计划的裂谷启动和进化计划的几个方面：构造，岩浆，侵蚀和沉积过程如何相互作用；地幔动力学在沿这个被动边缘持续变形中的作用；古代区域结构对塑造地质活动当今分布的长期演变的影响。长达一年的海洋底部地震计阵列（oppip-30仪器）将在哈特拉斯角（Cape Hatteras）延伸岸上覆盖范围（可运输阵列，相关的30个地点）。密度间隔的地震仪的其他样带将记录在整个海岸线上传播的地震波，记录从大陆坡到沿海平原的更详细的结构。多通道地震反射数据将在完成基本处理的培训研讨会后公开提供。同样，将分发地震折射数据进行第二次培训研讨会。使用自然地震事件进行调查的数据也将通过IRIS数据管理中心公开获得。站间距和阵列孔径目标地壳和上地幔成像。 实验设计建立在现有数据的基础上，以解决当前的科学问题，强调了更深的结构，这将阐明持续进化的驱动力，并将其现代化的浅结构约束，以更好地记录表面响应记录及其与冰川，海平面，沉积，沉积和岩浆载荷历史的关系。