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分析和一致的、高质量的震源参数目录，即全球CMT目录。全球CMT项目的目标是提供最好和最全面的全球地震应变释放记录。在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建模和解释提供了有价值的约束。CMT参数允许描述和预测由于地震引起的全球地面运动。CMT目录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，以及研究复杂和不寻常的地震事件，并用于分析美国和其他地方的地震危险性。不同层次的教育工作者将来自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大于或等于5.0级的所有地震。结果通过项目网站以及IRIS数据管理中心和国际地震中心发布；快速分析也通过电子邮件传播。该奖项支持的工作包括五个主要活动：(1)系统地测定全球5.0级及以上地震的矩张量，并将结果存档到CMT目录；(2)全球5.5级及以上地震矩张量的快速确定和结果的快速传播；(3)管理CMT目录，并继续改进该数据库的分发机制；(4)利用表面波对震源进行常规探测和定位，并发布探测到的地震事件目录；(5)全球地震台网（GSN）和其他地震台网的地震波质量调查。该合同还将支持在CMT分析中整合一个更新的表面波色散模型，并开发一种标准方法，用于分布从表面波分析中获得的地震探测。

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; (4) Routine detection and location of seismic sources using surface waves and distribution of a catalog of detected events; (5) Investigations of the quality of seismic waveforms from the Global Seismographic Network (GSN) and other seismic networks. This award will also support incorporation of an updated model of surface-wave dispersion in the CMT analysis and the development of a standard method for distributing earthquake detections obtained from surface-wave analysis.