远震与极远震部分震相的幅值-震级-震中距-深度建模与应用研究  

Modeling and applications on amplitude-magnitude-distance-depth of some teleseism and ultra-teleseism phases

作　　者：薛方正[1] 王红春[1] 朱号锋[1] 徐雄[1] Xue Fangzheng;Wang Hongchun;Zhu Haofeng;Xu Xiong(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,西安710024

出　　处：《地震学报》2022年第3期413-426,共14页Acta Seismologica Sinica

摘　　要：不同震相具有不同的振动特性和传播规律,对应各自不同的幅值-震中距-深度衰减规律,本文基于禁核试核查国际数据中心公报,统计P,PcP,PKP,PKPbc及PKPab远震和极远震震相样本随震中距的分布,运用基于残差统计的迭代方法回归上述震相的幅值-震级-震中距-深度模型,通过震级残差标准差与均值的统计进行模型评估,结果显示:P,PcP,PKP,PKPbc及PKPab震相的震级残差标准差范围为0.30—0.36,满足一般震相相容性判断的需求;除PKPbc的残差均值大于0.03外,其余震相残差均值均为0.01左右,模型的系统偏差极小,甚至可以忽略不计。最后针对模型进行了幅值预测比对、震级相容性检测、极远震体波震级计算等三个不同场景的应用研究,验证模型可用于日常地震监测。The consistency analysis of the signal feature is an important method to estimate the relationship between the event and the signal in the detection of seismic event.The consistency of amplitude can be used for determination of association through the comparison of amplitude residuals with numerous signal features on time and frequency domain.Different phases comply with the different propagation and attenuation law of amplitude-distance-depth.In this paper,the distribution of sample size varying with the distance of teleseism and ultra-teleseism phases such as P,PcP,PKP,PKPab and PKPbc based on the IDC is made.The model of amplitude-magnitude-distance-depth is constructed by iterative regression based on the residual statistics.The model is estimated through the standard deviation and mean of residual of magnitude.The range of standard deviation of residual of magnitude is 0.30−0.36.It could satisfy the requirements of phase consistency.Besides the mean of residual of magnitude of PKPbc phase is greater than 0.03,the rest phases is about 0.01.It demonstrates that the system deviation of the model is so tiny that it could be neglected.The application research of model is carried out by three different cases such as comparison of predicted amplitude,detection of magnitude consistency and magnitude calculation of ultra-teleseism events.The application research demonstrates that these models could be applied to routine seismic monitoring.

关 键 词：事件检测 震相相容性 残差统计 幅值-震级-震中距-深度模型 

分 类 号：P315.32[天文地球—地震学]