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Abstract <p>The instrumental and macroseismic data on the earthquake of September&#xa0;4, 2018 at 22:58:1 UTC, <i>ML</i> = 5.4, <i>I</i><sub>0</sub> = 6.4 ± 0.3, near the city of Katav-Ivanovsk in Chelyabinsk oblast (Southern Urals) are presented. This event with <i>ML</i> = 5.4 and <i>mb</i> = 5.5 became the strongest instrumentally recorded earthquake in the Urals and had the highest macroseismic effect among the Russian earthquakes in 2018 (<i>I</i><sub>0</sub> = 6.4 ± 0.3). For the first time in the practice of processing macroseismic data in the Urals, the Seismic Intensity Scale 2017 (GOST R 57546-2017) was used. For the first time for natural earthquakes in the Urals, an aftershock process was recorded, the active stage of which lasted about 11&#xa0;months, while many aftershocks had a significant macroseismic effect. Taking into account the spatial orientation of the aftershock cloud, the focal mechanism solution was confirmed and the tectonic position of the source was substantiated.</p>

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September 4, 2018, Katav-Ivanovsk Earthquake with ML = 5.4, mb = 5.5, I0 = 6.4

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • F. G. Verkholantsev,
  • R. A. Diagilev,
  • D. Yu. Shulakov,
  • Yu. V. Varlashova

摘要

Abstract

The instrumental and macroseismic data on the earthquake of September 4, 2018 at 22:58:1 UTC, ML = 5.4, I0 = 6.4 ± 0.3, near the city of Katav-Ivanovsk in Chelyabinsk oblast (Southern Urals) are presented. This event with ML = 5.4 and mb = 5.5 became the strongest instrumentally recorded earthquake in the Urals and had the highest macroseismic effect among the Russian earthquakes in 2018 (I0 = 6.4 ± 0.3). For the first time in the practice of processing macroseismic data in the Urals, the Seismic Intensity Scale 2017 (GOST R 57546-2017) was used. For the first time for natural earthquakes in the Urals, an aftershock process was recorded, the active stage of which lasted about 11 months, while many aftershocks had a significant macroseismic effect. Taking into account the spatial orientation of the aftershock cloud, the focal mechanism solution was confirmed and the tectonic position of the source was substantiated.