EARTHQUAKE of APRIL 24, 2018 with KR=10.5, Мw3.9 and I0=5 in the ANAPA-NOVOROSSIYSK ZONE

Abstract

The article presents instrumental and macroseismic data on the earthquake of April 24, 2018 with Мw=3.9, which occurred at the Black Sea coast near the Abrau Peninsula. The earthquake was felt in 15 settlements at distances up to 52 km from the epicenter with an intensity of 3 to 5 points. The earthquake occurred in the Black Sea zone of occurrence of earthquakes. The scalar seismic moment М0 and the spectral moment magnitude Mw=3.9 were calculated based on the spectra of seven regional stations. The focal mechanism was constructed based on the signs of the first movement in the P-wave at 68 stations. It is established that a thrust has occurred in the source along a northwest-trending plane dipping to the northeast, which is consistent with the orientation and dip of the fault planes of tectonic structures in the area of the source. The macroseismic manifestations of the April 24, 2018 earthquake made it possible to choose the most acceptable depth value and calculate the intensity at the epicenter (h=10 km, I0=5)