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Modelling correlation between Gutenberg-Richter parameters a and b in PSHA

机译:PSHA中古腾堡 - 里希特参数A和B的建模相关性

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It is a common practice to describe the activity of a seismogenic source using Gutenberg-Richter magnitude-frequency relation. The use of this relation includes the statistical determination of three parameters, two of which will be discussed in this paper: the exceedance rate of a threshold magnitude and the rate of decay of the exceedance rate with magnitude. The third parameter, M-max , which defines the maximum assumed magnitude, will not be treated here. Due to the methods used to estimate the values of these parameters under certain circumstances, their statistical estimators turn out to be correlated. In this paper we explore: (1) the impact of this correlation on seismic hazard for some simple, canonical cases; and (2) practical ways in which this correlation can be propagated through the seismic hazard calculations. We conclude that the impact of correlation on seismic hazard estimates is moderate and that ignoring correlation is frequently a conservative decision. Also, we propose a way in which correlation can be propagated into seismic hazard calculations within the framework of logic trees.
机译:使用古龄 - 富勒斯幅度频率关系描述脱离源的活性是一种常见的做法。这种关系的使用包括三个参数的统计测定,其中两个将在本文中讨论:阈值幅度的超标率和衰减率的幅度为幅度。定义最大假定幅度的第三个参数m-max将不会在此处处理。由于用于在某些情况下估计这些参数值的方法,它们的统计估计结果将结果相关。在本文中,我们探索:(1)这种相关性对一些简单,规范案件的地震危害的影响; (2)这种相关性可以通过地震危害计算传播这种相关的实际方法。我们得出结论,相关性对地震危害估计的影响是中等的,忽略相关性往往是一个保守的决定。此外,我们提出了一种方法,其中相关性可以在逻辑树的框架内传播到地震危险计算中。

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