The global fracture zone and magnetic lineation data base project

全球断裂带和磁力线数据库项目

• 批准号: 0752543
• 负责人: Paul Wessel
• 金额: $ 18.76万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0752543&HistoricalAwards=false
• 关键词: global; fracture; zone; magnetic; lineation

Intellectual Merit: Plate kinematic models derive from the detailed identifications of conjugate magnetic isochron picks and fracture zones (FZ). These data form the foundation of all relative marine plate tectonic reconstructions and codify our understanding of Earth?s surface evolution since the Mesozoic. Furthermore, FZ traces have extensive uses in many other marine geophysical investigations such as studying the origins of transform fault offsets, identifying seamounts and isolating abyssal hill roughness within fracture zone provinces, examining predictions from competing thermal models of the lithosphere, and much more. Kinematic models also require temporal information and this dimension is provided by identification of key magnetic isochron boundaries from total field magnetic anomalies collected along ship tracks. The joint FZ and isochron pick data constitute the fundamental constraints on marine relative plate motion models. The present research is a two-year pilot project to establish new infrastructure for users of FZ and magnetic isochron data: * An open source, community-driven database will be developed where consistent and well-documented information on FZ and magnetic isochrons will be collected, accessible from a dedicated website designed and operated in a manner similar to Wikipedia. * For fracture zones, mostly meta-data about each FZ and a few key locations along its trace will be stored. A semi-automatic FZ tracker will derive the optimal traces from the most recent data grids, guided by the supplied metadata and crossing ship-track profiles. * For magnetic isochron picks, a common way of reporting this information will be imposed and already published picks will be collected for the initiation of the database. Further additions will be coordinated so that the global database can serve as an evolving resource for the plate tectonic community. Trusted expert users will be allowed to add or revise information in the database, and all information stored will be under version control, allowing the history of the database to be reconstructed. Software will developed to assist in the entry of new FZ and magnetic anomaly pick data as well as provide options for search and extraction of data in popular file formats. Broader impacts of the proposed activity: Plate tectonic reconstructions form the basis for much geologic research. The improvements that this framework will make possible will be felt over a wide cross section of the Earth sciences. In addition, the availability of global, self-consistent FZ traces will impact numerous lines of marine research. Scientists requiring detailed knowledge of FZ alignments may extract traces by specifying a smoothness criterion. As most infrastructure projects, this will by its nature have wide impact. Several graduate and undergraduate students will be involved in this project and learn valuable skills pertaining to marine geophysical research and data analysis. The public will obtain access to the results of this work via the project web site. Here, material for public consumption (images, animations, etc) will be made available.

智力优势：板块运动学模型来自共轭磁等时线和断裂带（FZ）的详细识别。这些数据形成了所有相关的海洋板块构造重建的基础，并整理了我们对地球的理解。中生代以来的地表演化。此外，FZ痕迹在许多其他海洋地球物理调查中有着广泛的用途，例如研究转换断层偏移的起源，确定海山和分离断裂带区内的深海丘陵粗糙度，检查岩石圈相互竞争的热模型的预测等等。运动学模型还需要时间信息，这一维度通过从沿着船舶航迹收集的总场磁异常中识别关键磁等时线边界来提供。联合FZ和等时线拾取数据构成了海洋相对板块运动模型的基本约束。目前的研究是一个为期两年的试点项目，为FZ和磁性等时线数据的用户建立新的基础设施：* 将开发一个开源的社区驱动的数据库，其中将收集关于FZ和磁性等时线的一致和有据可查的信息，可以从一个专门的网站访问，该网站的设计和操作方式类似于维基百科。* 对于断裂带，将存储关于每个FZ的大部分元数据和沿着其轨迹的一些关键位置。半自动FZ跟踪器将根据提供的元数据和交叉航迹剖面，从最新的数据网格中导出最佳航迹。* 对于磁性等时线选取，将采用一种通用的方式报告这一信息，并将收集已发布的选取，以启动数据库。将协调进一步的添加，以便全球数据库可以作为板块构造群落的不断发展的资源。可信任的专家用户将被允许添加或修改数据库中的信息，所有存储的信息将受到版本控制，从而可以重建数据库的历史。将开发软件，以协助输入新的自由区和磁异常拾取数据，并提供搜索和提取流行文件格式数据的选项。拟议活动的更广泛影响：板块构造重建构成了许多地质研究的基础。这一框架所带来的改进将在地球科学的广泛领域得到体现。此外，全球性、自洽的自由区痕迹的可用性将影响海洋研究的许多方面。需要FZ对齐的详细知识的科学家可以通过指定平滑标准来提取迹线。与大多数基础设施项目一样，这将产生广泛的影响。一些研究生和本科生将参与这个项目，并学习有关海洋地球物理研究和数据分析的宝贵技能。公众将通过项目网站获得这项工作的结果。在这里，将提供供公众消费的材料（图像、动画等）。