Community Facility Support: The Global CMT Project

该奖项支持全球质心-矩-张量(CMT)项目，该项目提供全球地震活动的分析和一致的、高质量的震源参数目录--全球CMT目录。全球CMT项目的目标是提供现有全球地震应变释放的最佳和最全面的记录。CMT分析中确定的基本地震参数代表了对震源过程的初步观测，并为全球和区域构造活动的模拟和解释提供了有价值的约束条件。CMT参数允许描述和预测地震引起的全球地面运动。CMT Catalog是用于区域地震活动和构造研究的标准数据库，其结果用于研究地震引起的应力变化和变形，以及用于研究复杂和不寻常的地震事件，以及用于美国和其他地方的地震危险性分析。不同级别的教育工作者将CMT项目的产品整合到各种活动中。CMT项目目前的操作目标是分析世界上任何地方发生的所有大于或等于5.0级的地震。结果通过项目网站以及IRIS数据管理中心和国际地震学中心传播；快速分析也通过电子邮件传播。该奖项支持的工作涉及五项主要活动：(1)系统地确定全球5.0级及以上地震的矩张量，并将结果存档到CMT目录中；(2)快速确定全球5.5级及以上地震的矩张量，并迅速传播结果；(3)建立CMT目录，继续改进该数据库的分布机制；(4)利用面波和探测到的事件目录的分布，对震源进行例行探测和定位。该奖项还将支持将CMT结果自动贡献到USGS/NEIC产品分布层(PDL)所需的改进，以及使用一套同质的现代地球模型和分析技术重新计算CMT目录的规划和技术准备。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This award supports the Global Centroid-Moment-Tensor (CMT) Project, which provides analysis of global earthquake activity and a consistent, high-quality catalog of earthquake source parameters, the Global CMT Catalog. The objective of the Global CMT Project is to provide the best and most comprehensive record of global seismic strain release available. The basic earthquake parameters determined in a CMT analysis represent primary observations of the earthquake source process and provide valuable constraints for modeling and interpretation of global and regional tectonic activity. The CMT parameters allow description and prediction of global ground motion due to an earthquake. The CMT Catalog is the standard data base used in regional seismicity and tectonic studies, and the results are used in studies of stress changes and deformation due to earthquakes, as well as for research into complex and unusual seismic events, and for analyses of seismic hazard in the US and elsewhere. Educators at several levels integrate products from the CMT Project in a variety of activities. The CMT Project's current operational goal is to analyze all earthquakes with magnitudes greater than or equal to 5.0 occurring anywhere in the world. The results are disseminated via the project web site as well as by the IRIS Data Management Center and the International Seismological Centre; rapid analyses are also disseminated by email. The work supported by this award involves five main activities: (1) Systematic determination, with a three-month delay, of moment tensors for earthquakes of magnitude 5.0 and larger globally, and archiving of the results in the CMT catalog; (2) Rapid determination of moment tensors for earthquakes of magnitude 5.5 and larger globally and quick dissemination of the results; (3) Curation of the CMT catalog and continued improvements of the distribution mechanisms for this data base; and (4) Routine detection and location of seismic sources using surface waves and distribution of a catalog of detected events. This award will also support improvements necessary for automated contribution of CMT results to the USGS/NEIC Product Distribution Layer (PDL); and planning and technical preparation for the recalculation of the CMT catalog using a homogeneous set of modern Earth models and analysis techniques.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.