Moment and Local Magnitudes Calibration for Earthquakes in the Northwest Caucasus

The dynamic parameters of the sources of 44 earthquakes in the North Caucasus were determined from the amplitude spectra of S-waves for the period 2018–2019 with an energy class according to T.G. Rautian scale KR=9.1–14.1. Earthquake records from regional digital seismic stations of the North Caucasus network, with epicentral distances of no more than 300 km were used for the calculation. The source spectra were calculated based on the frequency-dependent quality factor Q(f) for earthquakes in the North Caucasus western zone – Q(f)=90f 1.02 – and eastern zone – Q(f)=97f 0.89 . The SEISAN program was used for the spectral analysis of 31 earthquakes. The following values were obtained: 0 – spectral density, f0 – corner frequency, M0 – scalar seismic moment, Mw – moment magnitude, L – length of the rupture at the source of an earthquake, or r – radius of the circular area,  – stress drop. Relationships between lgM0 and KR and Mw and KR are obtained.

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

Klyanchin,

Zvereva,

Gabsatarova

2023

Earthquakes in Northern Eurasia

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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)

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Moment and Local Magnitudes Calibration for Earthquakes in the Northwest Caucasus

Cited by 6 publications

References 12 publications

Coda Q in the Geophysical Environment of the Northeast Caucasus

Coda Q in the Geophysical Environment of the Northeast Caucasus

SPECTRAL and SOURCE PARAMETERS of NORTH CAUCASUS EARTHQUAKES in 2018–2019

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

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