Facility Support: The Global CMT Project

全球质心-矩-张量项目(GCMT项目)的目标是利用地震数据分析和量化世界范围内发生的所有中、大地震，并提供现有最全面的全球地震应变释放记录。来自全球地震台网的数据是从IRIS数据管理中心(DMC)和各个网络运营商近乎实时地收集的，用于分析大地震。后来从IRIS DMC检索更多的存档数据，以确定最终结果并调查较小震级的事件。GCMT项目的主要目标和活动是：1.系统地确定全球5级地震的矩张量，并将结果存档到GCMT目录中。快速确定全球5.5级地震的矩张量，并迅速传播结果(“快速CMT”)。4.管理和分发GCMT目录，其中包含1976年至今期间的矩-张量结果，目前超过35,000次地震。利用面波进行常规震源探测和定位。5.调查和报告全球地震台网和其他地震台网的地震波形质量。6.具有特殊重要性的地震序列的系统分析。

The goal of the Global Centroid-Moment-Tensor Project (GCMT Project) is to analyze and quantify all moderate and large earthquakes occurring worldwide using seismic data, and to provide the most comprehensive record of global seismic strain release available. Data from global seismographic networks are collected from the IRIS Data Management Center (DMC) and from individual network operators in near-real time for the analysis of large earthquakes. Additional archived data are later retrieved from the IRIS DMC to determine final results and to investigate events of smaller magnitude.The major objectives and activities of the GCMT Project are:1. Systematic determination of moment tensors for earthquakes with magnitude M5 globally, and archiving of the results in the GCMT catalog.2. Rapid determination of moment tensors for earthquakes with M5.5 globally, and quick dissemination of the results ("quick CMTs").3. Curation and distribution of the GCMT catalog, which contains moment-tensor results for the period 1976 to the present, currently more than 35,000 earthquakes.4. Routine detection and location of seismic sources using surface waves. 5. Investigation and reporting of the quality of seismic waveforms from the Global Seismographic Network other seismic networks. 6. Systematic analysis of earthquake sequences of special importance.