地震震級統(tǒng)計研究
發(fā)布時間:2018-05-28 05:04
本文選題:極值理論 + GEV模型; 參考:《南京師范大學》2015年碩士論文
【摘要】:地震震級是地震研究中的基本概念。本文討論地震震級的概率意義與統(tǒng)計分析問題。將地震震級作為隨機變量處理,本文從概率論的角度給出了地震研究中常用概念的概率定義,包括地震危險性,平均復發(fā)周期,重現(xiàn)水平,平均發(fā)震次數(shù)等,并給出其統(tǒng)計計算方法。本文第二個主要工作是考察估計地震震級分布的統(tǒng)計方法。以極值理論為基礎,本文改進了基于能量的模型。本文對1970年至2013年云南地區(qū)的地震震級數(shù)據(jù)進行了統(tǒng)計分析,分別用GEV模型,POT模型,基于能量的模型以及修正的能量模型對震級分布給出估計結(jié)果,并計算相應的平均復發(fā)周期和重現(xiàn)水平等基本概念。通過比較可以發(fā)現(xiàn),改進后的方法可以在很大程度上提高和改善基于能量模型的效果,使之在數(shù)據(jù)存在缺失或者余震時,能夠有更強的適應性。
[Abstract]:Magnitude is a basic concept in seismic research. The probabilistic significance and statistical analysis of magnitude are discussed in this paper. Taking the magnitude of earthquake as a random variable, this paper gives the probability definition of common concepts in seismic research from the point of view of probability theory, including seismic risk, average recurrence period, recurrence level, average earthquake occurrence times, etc. The statistical calculation method is also given. The second major work in this paper is to investigate the statistical methods for estimating magnitude distribution. Based on the extreme value theory, this paper improves the energy-based model. In this paper, the magnitude data of Yunnan from 1970 to 2013 are statistically analyzed. The magnitude distribution is estimated by using the GEV model and the POT model, based on the energy model and the modified energy model, respectively. The corresponding basic concepts such as mean recurrence period and recurrence level were calculated. It is found by comparison that the improved method can improve and improve the effect of the energy model to a great extent and make it more adaptable when the data is missing or aftershock.
【學位授予單位】:南京師范大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:P315.32
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,本文編號:1945385
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