An evaluation of the characteristic aftershock parameters following the 24 January 2020 Mw = 6.8 Elazığ-Sivrice (Türkiye) earthquake

Pub Date : 2023-01-01 DOI:10.5200/baltica.2023.1.6
S. Öztürk
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Abstract

A comprehensive evaluation of region-time-magnitude behaviours of aftershocks following the 24 January 2020 (Mw = 6.8) Elazığ-Sivrice (Türkiye) earthquake was achieved by using the characteristic parameters such as b-value, p-value, Dc-value and Mamax value of aftershock occurrences. The b-value was calculated as 0.82 ± 0.02 by considering the magnitude of the completeness value as Mcomp = 1.9, and it is relatively small compared to typical b ≈ 1 for the magnitude-frequency relationship of aftershocks. This low b-value may also be caused by the abundance of aftershocks with ML ≥ 4.0. The p-value was computed as 0.80 ± 0.02 with c-value = 0.279 ± 0.098 and is smaller than the global value of p ≈ 1. This low p-value may be due to a relatively slow decay rate of aftershock activity, and the modified Omori model seems appropriate for the estimation of decay parameters. The Dc-value was estimated as 1.87 ± 0.07. This large value shows that aftershocks are homogeneously distributed and more clustered at larger scales/in smaller areas. The temporal variation of b-value indicates that decreases in b-value may result from the gradual increase in the effective stress following the larger aftershocks. The lowest b-values and Mamax values greater than 5.0 were observed in the north, south and southwest parts of the mainshock including Pütürge and Erkenek segments. These results show that there is an apparent relation between the smallest b-values and the largest Mamax values. The largest p-values were estimated in and around the main shock including Pütürge segment. The regions with the smallest b-value and the largest p-value have high stress and coseismic deformation, respectively. Stress variations and coseismic deformation are extremely effective on the changes of b- and p-values. As a remarkable result, aftershock hazard following the mainshock may be considered extremely related to aftershock parameters, and detailed analyses of the region-time-magnitude characteristics of aftershocks are recommended for a preliminary evaluation following the mainshock.
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2020年1月24日Mw = 6.8 Elazığ-Sivrice (t rkiye)地震后特征余震参数的评估
利用余震发生的b值、p值、dc值和Mamax值等特征参数,对2020年1月24日(Mw = 6.8) Elazığ-Sivrice (trkiye)地震后余震的区域时间级行为进行了综合评价。考虑完备值的震级Mcomp = 1.9,计算得到的b值为0.82±0.02,与典型的余震震级-频率关系的b≈1相比,b值相对较小。这种低b值也可能是由于ML≥4.0的余震较多所致。p值为0.80±0.02,c值为0.279±0.098,小于p≈1的全局值。这种低p值可能是由于余震活动衰减速率相对较慢,改进的Omori模型似乎适合于衰减参数的估计。dc值估计为1.87±0.07。这个大数值表明余震分布均匀,在更大的尺度/更小的区域更集中。b值的时间变化表明,b值的减小可能是由于较大余震后有效应力逐渐增大所致。最小的b值和大于5.0的Mamax值出现在主震的北部、南部和西南部,包括p tt段和Erkenek段。这些结果表明,最小的b值与最大的Mamax值之间存在明显的关系。最大的p值估计在主震及其周围,包括p tt段。b值最小的区域和p值最大的区域分别具有较高的应力和同震变形。应力变化和同震变形对b值和p值的变化非常有效。结果表明,主震后的余震危险性可能与余震参数密切相关,建议对余震的区域时间震级特征进行详细分析,以进行主震后的初步评价。
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