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Optimization of Surface Wave Identification and Measurement

机译：表面波识别和测量的优化

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— Accurate and reliable measurement of surface waves is important to Comprehensive Nuclear-Test-Ban Treaty (CTBT) monitoring because the M s :m b discriminant and its regional variants can in many cases unambiguously identify events as earthquakes or explosions. Surface wave processing at the International Data Center (IDC) is designed to be completely automated and is performed using the program Maxsurf. Maxsurf searches for surface wave characteristics in the expected surface wave arrival time window for all continuous long-period and broadband data in the IDC processing stream. The Prototype IDC GSETT3 Reviewed Event Bulletin (REB) now contains a very large and growing data set of surface wave measurements. Users of this data set need to be aware of processing changes and calibration errors in the GSETT3 experimental bulletin. The prototype International Monitoring System (IMS) surface wave detection threshold is approximately one magnitude unit lower than the detection threshold of other global networks that use visual identification of surface waves. Surface wave identification and measurement can be improved through development of regionalized earth models, phase-matched filtering and the use of path corrected spectral magnitudes in place of M s . Regionalized earth models are developed through tomographic inversion of a very large data set of phase and group velocity dispersion measurements. Discrimination capability can be improved through the use of maximum likelihood magnitudes and maximum likelihood upper bounds.
机译：—准确，可靠地测量表面波对于全面禁止核试验条约（CTBT）的监测很重要，因为M s ：mb 判别式及其区域变体在许多情况下可以明确地将事件识别为地震或爆炸。国际数据中心（IDC）的表面波处理被设计为完全自动化，并且使用Maxsurf程序执行。 Maxsurf在预期的表面波到达时间窗口中搜索IDC处理流中所有连续的长周期和宽带数据的表面波特性。 IDC GSETT3原型审查事件公告（REB）现在包含一个非常大且不断增长的表面波测量数据集。该数据集的用户需要了解GSETT3实验公告中的处理变化和校准错误。原型国际监测系统（IMS）的表面波检测阈值比使用视觉识别表面波的其他全球网络的检测阈值低大约一个数量级单位。可以通过开发区域化地球模型，相位匹配滤波以及使用路径校正的光谱幅度代替M s来改善表面波的识别和测量。通过对很大的相位和群速度色散测量数据集进行断层成像反演，可以开发出区域化地球模型。可以通过使用最大似然大小和最大似然上限来提高区分能力。

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