Affiliation:
1. Geophysical Survey of the Russian Academy of Sciences
2. Mining Institute, Ural branch of the Russian Academy of Sciences
Abstract
The instrumental and macroseismic data on the earthquake of September 4, 2018 at 22h58m19s UTC, ML=5.4, I0=6.4±0.3 near the city of Katav-Ivanovsk in the Chelyabinsk region (South Urals) are presented. This event with ML=5.4 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.
Publisher
Geophysical Survey of the Russian Academy of Sciences - GS RAS
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