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。来自全球地震台网的数据是由IRIS数据管理中心（DMC）和各个台网运营商近实时收集的，用于大地震分析。随后从IRIS DMC检索其他存档数据，以确定最终结果并调查较小规模的事件。GCMT项目的主要目标和活动是：1。全球M5级地震矩张量的系统测定，并将结果存档于GCMT目录2 .全球5.5级地震矩张量的快速测定和结果的快速传播（“快速cts”）。管理和分发GCMT目录，其中包含从1976年到现在的矩张量结果，目前超过35,000次地震。利用表面波对震源进行常规探测和定位。5. 全球地震台网和其他地震台网地震波形质量的调查和报告。6. 系统分析地震序列具有特别重要的意义。

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.