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本文利用华北南部地区的近震最大震相位移资料通过震级残差法及回归分析论述了近震最大震相的平均衰减形态及其分区段性。近震最大震相平均衰减形态的研究是估算近震震级的基础。如果假设近震最大震相的平均衰减形态与地震的强度无关,那么根据震级标度的定义可以直接确定震级的量规函数。反之,近震震级量规函数描述了一定区域范围内的最大震相平均衰减特性。很清楚,近震最大震相随着震中距的变化在不同震中距范围内属于不同路径传播的波,因此,在整个近震范围内利用单一的解析函数形式来描述其平均衰减形态是不合理的。本文将利用不同方法试图合理估算不同震中距范围的平均衰减形态。
In this paper, by means of magnitude residual method and regression analysis, the maximum attenuation phase of near earthquakes in southern North China is discussed. The study of the average attenuation form of the maximum phase of near-earthquakes is the basis for the estimation of the magnitude of near-earthquakes. If we assume that the average attenuation form of the maximum phase of near-earthquakes is independent of the strength of the earthquake, the magnitude function of the magnitude can be directly determined from the definition of the magnitude scale. Conversely, the near-earthquake magnitude gauge function describes the average attenuation characteristics of the largest phase in a given area. It is clear that the maximum phase of near-earthquakes propagates in different paths within different epicenter distances as the epicentral distance changes. Therefore, it is unreasonable to describe the average decay pattern in the whole range of near-earthquakes using a single analytic function of. In this paper, we will use different methods to try to reasonably estimate the average attenuation morphology of different epicentral distances.