Abstract
The article presents instrumental and macroseismic data on the earthquake on 12.12.2020 at 14:54 with Mw=3.8, h=30 km. The epicenter and parameters of the earthquake were deter-mined using instrumental data from the network of regional seismic stations in the western zone of the North Caucasus of the EGS RAS. This earthquake occurred in the shelf zone of the Eastern Black Sea coast near the resort town of Anapa, in the Anapa seismically active area. This area tectonically is the conjunction of the northern side of the Tuapse trough and the thrust front of the Greater Caucasus. The focal mechanism for the earthquake was calcu-lated. The solution of the focal mechanism was obtained from the polarization in P-waves at 29 seismic stations. From the focal follows the type of source up thrust-thrust movement. The GS RAS organized a macroseismic survey in the Anapa and Novorossiysk regions on the “VKontakte” social network a day after the earthquake. According to the results of the study, 144 respondents in 15 settlements in 7 days were interviewing. The maximum observed in-tensity was I=4-5 points in Su-Psekh and Varvarovka according to the results of the macro-seismic survey, a map of the distribution of intensity points was create. The SEISAN software package calculated the spectral parameters of the source: seismic moment, corner frequency, spectral density level and spectral magnitude Mw.
Highlights
The epicenter and parameters of the earthquake were determined using instrumental data from the network of regional seismic stations in the western zone of the North Caucasus of the EGS RAS. This earthquake occurred in the shelf zone of the Eastern Black Sea coast near the resort town of Anapa, in the Anapa seismically active area
The solution of the focal mechanism was obtained from the polarization in P-waves at 29 seismic stations
The GS RAS organized a macroseismic survey in the Anapa and Novorossiysk regions on the “VKontakte” social network a day after the earthquake
Summary
Первичные параметры гипоцентра землетрясения были получены в Службе срочных донесений (ССД) ФИЦ ЕГС РАН [Виноградов и др., 2021], куда в режиме, близком к реальному времени, поступают записи более 50 сейсмических станций России и мира. Кроме данных региональной сети сейсмических станций в обработке использовались записи волновых форм сейсмических станций Крымской сети, которые в настоящее время также поступают в центр сбора данных ФИЦ ЕГС РАН в непрерывном режиме. При сравнении результатов первичной локации, полученной в ССД и уточнённой с использованием данных региональной сети сейсмических станций Западного Кавказа, наблюдается смещение эпицентра на 12 км в северо-восточном направлении и увеличение глубины h с 10 до 30 км. Решение по данным региональной сети было выбрано как более точное, поскольку для его расчёта использовалось максимальное количество сейсмических станций, расположенных вблизи эпицентра с удовлетворительным значением азимутального створа (GAP=141°), ближайшие станции (SUKR и ANN) были удалены на 13–20 км
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