GEODYNAMICS

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2023-06-01 DOI:10.23939/jgd2023.01.070
Dmytro Malytskyy, Andriy Gnyp
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Abstract

Understanding the source mechanisms of induced earthquakes is important to distinguish them from natural earthquakes. The main objective of our study consists in finding out which parameters of the source mechanism can be used most effectively to identify the induced earthquakes. A possibility is also being explored whether they can be retrieved from data of a limited number of stations or even just one. We calculate versions of the seismic moment tensor and the corresponding focal mechanisms of the induced event of 2015-06-13 (t0=23:57:53.00 UTC, φ=54.233˚N, λ=-116.627˚E, hs=4 km, ML4.4) near Fox Creek, Alberta, Canada, by inversion of only direct waves recorded at one, two, three and seven stations. The versions turned out to be practically identical, which indicates the advantage of using only direct waves and the very possibility of determining the focal mechanism from the records at the limited number of seismic stations, which may be especially valuable in areas with a sparse seismic network. The versions also turned out to be very similar to the one obtained in [Wang, 2018], which can be considered an additional proof of the reliability of our method. The source time function of the Alberta event had a longer duration (~4 s) than is typical for tectonic earthquakes of similar size. We assume that this very feature may be specific to induced earthquakes and used in combination with others to distinguish them from tectonic earthquakes.
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了解诱发地震的震源机制对于区分诱发地震与自然地震具有重要意义。我们研究的主要目的在于找出震源机制的哪些参数可以最有效地用于识别诱发地震。目前还在探索是否可以从有限数量的监测站或甚至只有一个监测站的数据中检索它们的可能性。本文通过对1、2、3、7个台站记录的直接波进行反演,计算了2015年6月13日(t0=23:57:53.00 UTC, φ=54.233˚N, λ=-116.627˚E, hs=4 km, ML4.4)在加拿大艾伯塔省Fox Creek附近诱发事件的地震矩张量和相应的震源机制。结果证明,这两个版本实际上是相同的,这表明只使用直达波的优势,以及从有限数量的地震台站记录中确定震源机制的可能性,这在地震台网稀疏的地区可能特别有价值。这些版本也被证明与[Wang, 2018]中获得的版本非常相似,这可以被认为是我们方法可靠性的额外证明。阿尔伯塔地震的震源时间函数比类似规模的典型构造地震的持续时间更长(约4秒)。我们认为,这一特征可能是诱发地震所特有的,并与其他特征结合使用,以区别于构造地震。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
自引率
33.30%
发文量
11
期刊最新文献
GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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