Abstract

When conducting seismological studies, initial data from different international seismological agency databases are often used. Determinations of earthquake hypocentral coordinates by different seismological agencies yield different results, associated with different observation systems, processing methods, and high-speed models. This can significantly affect the overall picture of the seismic process under study. Therefore, to identify the most preferable result, we assessed the accuracy of the initial data and hypocentral coordinates from different interpretations. Based on the international seismological agency data, the study refines the parameters of a tectonic earthquake recorded in northern Armenia on September 10, 2019, with a magnitude of M = 4.7, as well as its aftershocks, and redetermines the hypocentral coordinates using the Hypo_Bur program. Due to the high accuracy in redetermining the hypocenters of the main and aftershocks (the error in determining the hypocentral coordinates is in the range 0.1–2.4 km), the local nature of the seismogenic zone is revealed. As a result of the redetermination, the initial epicenter of the main shock was shifted 28 km northwest, and the overall pattern of the spatial distribution of aftershocks became more clustered. The focal mechanisms of the September 10, 2019 earthquake and its aftershocks were also plotted. A similar character of the kinematics of the Chaldyran–Viraayotsky fault and obtained values of the main nodal plane of the focal mechanism is shown.

中文翻译：

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重新确定初始地震数据的参数是研究地震活动空间特征的重要环节（以2019年9月10日为例，M = 4.7，亚美尼亚地震为例）

摘要

在进行地震研究时，经常使用来自不同国际地震机构数据库的初始数据。不同地震机构对地震震中坐标的确定产生不同的结果，这与不同的观测系统，处理方法和高速模型有关。这会严重影响正在研究的地震过程的整体情况。因此，为了确定最可取的结果，我们从不同的解释方法评估了初始数据和震中坐标的准确性。根据国际地震机构的数据，该研究细化了2019年9月10日在亚美尼亚北部记录的构造地震的参数，震级为M= 4.7，以及它的余震，并使用Hypo_Bur程序重新确定了次中心坐标。由于在重新确定主震和余震的震源方面具有很高的准确性（确定震中坐标的误差在0.1-2.4 km范围内），因此揭示了地震成因带的局部性质。重新确定的结果是，主震的初始震中向西北偏移了28 km，余震的空间分布总体格局更加趋于聚类。还绘制了2019年9月10日地震及其余震的震源机制。显示了Chaldyran–Viraayotsky断层的运动学的相似特征，以及获得的震源机制主节点面的值。