南高加索地区空间地震模式的聚类与统计分析

IF 2.1 4区 地球科学
Sergii Skurativskyi, Sergiy Mykulyak, Yuliya Semenova, Kateryna Skurativska
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引用次数: 0

摘要

高加索地区受阿拉伯和欧亚构造板块碰撞的影响,具有非均匀和强烈的地震活动特征。丰富多样的地震事件也使位于其南部的阿塞拜疆与众不同。在本研究中,我们考虑了2010年至2023年发生在阿塞拜疆及其邻近地区的地震,特别是空间地震模式。将基于密度的聚类算法应用于地震目录,得到了地震空间分布的合理分区。更详细地研究了目录划分为七个簇的统计特性。特别地,我们考虑随机变量,即地球表面固定点到地震震中的距离。对于不动点与聚类中心重合,聚类的震中服从二元正态分布的情况,构造了累积分布函数的解析逼近。为了进行比较,在Johnson曲线的基础上对数值分布函数进行了评估,并观察到很好的一致性。当固定点位于集群之外时,还考虑另一种情况。假设星团为圆形,中心均匀分布,推导了星团的累积分布函数和概率分布函数。将这些函数应用于Shamkir水电站到集群距离的直方图逼近,可以获得令人满意的一致性。这些结果有望为Shamkir站或阿塞拜疆关键基础设施的其他对象进行地震风险评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Cluster and statistical analysis of spatial earthquake patterns in the South Caucasus region

The Caucasus region is characterized by heterogeneous and strong seismicity as a result of collision between Arabian and Eurasian tectonic plates. A rich variety of seismic events also distinguishes Azerbaijan, located in its south part. In this research, we consider the earthquakes, specifically spatial earthquake patterns that occurred in Azerbaijan and adjacent areas from 2010 to 2023. Applying density-based clustering algorithms to the earthquake catalog, the proper partitions of spatial earthquake distributions were obtained. The statistical properties of the catalog’s partition into seven clusters are studied in more detail. In particular, we consider the random variable, which is the distance from the fixed point of the earth’s surface to earthquake epicenters. The analytical approximation of the cumulative distribution function is constructed for the case when the fixed point coincides with the cluster center and epicenters in the cluster are distributed by the bivariate normal distribution. For comparison, the numerical distribution functions are evaluated on the basis of Johnson curves and good agreement is observed. Another case is also considered when the fixed point lies outside of a cluster. Under the assumption that a cluster is a circle and epicenters in it are distributed uniformly, the cumulative and probability distribution functions are derived. Applying these functions to the approximation of histograms for the distances from the Shamkir hydroelectric power station to the clusters shows that satisfactory agreement can be achieved. These results are promising for performing the seismic risk assessment for the Shamkir station or other objects of Azerbaijan’s critical infrastructure.

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来源期刊
Acta Geophysica
Acta Geophysica GEOCHEMISTRY & GEOPHYSICS-
CiteScore
3.80
自引率
13.00%
发文量
251
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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