Abstract

On November 15, 2019, a sequence of small/micro earthquakes struck specific area near an oil production field in the northern part of the State of Kuwait. Generally, the phenomenon of the earthquakes swarming is rarely occurring in Kuwait. More than 56 earthquakes were monitored by the Kuwait National Seismic Network (KNSN) where the magnitudes of the earthquakes ranged between 0.8 and 4.1, and their recorded continued for two consecutive days. In this respect, we conducted a modern geophysical analysis (e.g. waveform-fitting, spectral analysis and faulting focal mechanism) to identify the nature and origin of these earthquakes. The values of moment tensors, double-couple (DC) and non-double-couple components signature, stress drop, and stress ratios are fundamentally calculated, in addition to detailed knowledge of the structural setting of the region where earthquake swarming occurred were also used to distinguish and estimate natural and anthropogenic components percentages of theses earthquakes. The results obtained indicated that these earthquakes sequence has an equivalent anthropogenic to tectonic component, meaning that it occurred as a result of oil extraction, but also occurred on pre-existing faults.

中文翻译：

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2019年11月15日科威特微地震序列的构造和人类活动特征

摘要

2019年11月15日，科威特州北部油田附近的特定区域发生了一系列小/微地震。通常，在科威特很少发生地震群聚的现象。科威特国家地震台网（KNSN）监测了56多次地震，震级在0.8到4.1之间，并连续两天记录下来。在这方面，我们进行了现代地球物理分析（例如，波形拟合，频谱分析和断层震源机制），以识别这些地震的性质和起源。从根本上计算出力矩张量，双耦合（DC）和非双耦合组件特征，应力降和应力比的值，除了详细了解发生地震的地区的结构设置外，还用于区分和估算这些地震的自然成分和人为成分的百分比。所获得的结果表明，这些地震序列具有与构造成分相同的人为因素，这意味着它是由于采油而发生的，但也发生在先前存在的断层上。