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全球范围内发生的所有中、大地震，并提供最全面的全球地震应变释放记录。从IRIS数据管理中心（DMC）和各个网络运营商近实时收集全球地震台网的数据，用于分析大地震。其他存档数据稍后会从综合注册资讯系统的灾害监测中心检索，以确定最终结果及调查规模较小的事件。系统地确定全球5级地震的矩张量，并将结果存档在GCMT目录中。快速确定全球5.5级地震的矩张量，并快速传播结果（“快速CMT”）。3. GCMT目录的管理和分发，其中包含1976年至今的动量张量结果，目前超过35，000次地震。4.利用面波对地震源进行常规探测和定位。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.特别重要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.