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：板块运动学模型来源于对共轭磁等时线镐和断裂带（FZ）的详细识别。这些数据构成了所有相关海洋板块构造重建的基础，并编纂了我们对地球的认识。中国自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也有广泛的应用，例如研究转换断层偏移的起源，识别海山和隔离断裂带省内的深海山粗糙度，检查岩石圈热模型的预测，等等。运动学模型还需要时间信息，这一维度是通过从沿航迹收集的总磁场异常中识别关键磁等时线边界来提供的。联合FZ和等时线pick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，旨在为FZ和磁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，在这个数据库中，将收集关于FZ和磁等时线的一致的、记录良好的信息，并从一个专门的网站上访问，该网站的设计和操作方式类似于维基百科。*对于裂缝带，将存储每个裂缝带的元数据以及沿裂缝带轨迹的几个关键位置。半自动FZ跟踪器将在提供的元数据和交叉船舶轨迹剖面的指导下，从最新的数据网格中获得最佳轨迹。*对于磁等时线取样，将采用一种共同的方式报告这些信息，并收集已公布的取样以建立数据库。进一步的补充将得到协调，这样全球数据库就可以作为板块构造界不断发展的资源。受信任的专家用户将被允许添加或修改数据库中的信息，并且存储的所有信息都将受到版本控制，从而允许重建数据库的历史。将开发软件，以协助输入新的FZ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：板块构造重建是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，全球自洽FZ轨迹的可用性将影响许多海洋研究线路。需要详细了解FZ对准知识的科学家可以通过指定平滑标准来提取痕迹。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。公众可透过计划网页查阅这项工作的成果。在这里，将提供供公众消费的材料（图像、动画等）。