Discrimination of quarry blasts from earthquakes in Northern and Central Egypt using linear and quadratic discriminant functions

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Journal of Seismology Pub Date : 2023-07-08 DOI:10.1007/s10950-023-10156-6
I. M. Korrat, M. N. Elgabry, Ahmed Lethy, H. M. Hussein, Evrim Yavuz, Adel S. Othman
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Abstract

Abstract  

In this study, seismic events in Northern and Central Egypt are inspected to discriminate quarry blasts from earthquakes. We examine a collection of 639 events in both time and frequency domains with local magnitudes of 1.5 ≤ ML ≤ 3.3 from the Egyptian Seismological Network’s seismic event catalogue between 2009 and 2015. The maximum S-wave to the maximum P-wave amplitude ratio, complexity (C), spectral ratio (Sr), and power of events (Pe) classifiers as well as two statistical approaches, linear discriminant function (LDF) and quadratic discriminant function (QDF), are used to distinguish between earthquakes and quarry blasts. The usage of the LDF and QDF forms did not result in any major differences in the discrimination. The results obtained by the LDF and QDF from (Pe-C) are the best of all approaches. The findings of all approaches were compared to get a final categorization for each event, and a decision was achieved when at least three of the four methods provided the same event category. In Northern Egypt, 243 earthquakes and 308 quarry blasts could be identified as final decisions, with two misclassified events, resulting in an overall success rate of 99.6%. In Central Egypt, 48 earthquakes and 36 quarry blasts were classified as a final decision, with two misclassified events, for an overall success percentage of 97.6%.

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利用线性和二次判别函数判别埃及北部和中部地震中采石场爆炸
在本研究中,对埃及北部和中部的地震事件进行了检查,以区分采石场爆炸和地震。我们研究了2009年至2015年间埃及地震台网地震事件目录中当地震级为1.5≤ML≤3.3的639个时间和频率域事件的集合。最大横波与最大纵波振幅比、复杂性(C)、谱比(Sr)和事件威力(Pe)分类器以及线性判别函数(LDF)和二次判别函数(QDF)两种统计方法用于区分地震和采石场爆炸。LDF和QDF格式的使用没有导致任何重大差异的歧视。LDF和QDF的结果是所有方法中最好的。将所有方法的结果进行比较,以获得每个事件的最终分类,当四种方法中至少有三种提供相同的事件分类时,就可以做出决定。在埃及北部,243次地震和308次采石场爆炸可以被确定为最终决策,有两次错误分类事件,导致总体成功率为99.6%。在埃及中部,48次地震和36次采石场爆炸被归类为最终决定,有两次错误分类事件,总体成功率为97.6%。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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