GEOMAGNETIC EFFECT OF THE EARTHQUAKES Mw = 7.5–7.8 IN TURKEY ON FEBRUARY 6, 2023

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Abstract

We study the response in geomagnetic field variations caused by a series of earthquakes with magnitudes Mw = 7.5–7.8 in Turkey on 6 February 2023. Initial data represent high-precision observations of the geomagnetic field with a 1-s sampling rate recorded at magnetic observatories of Russia and neighboring countries from middle to high latitudes. The paper analyzes the morphology of the geomagnetic signal, its amplitude-frequency characteristics, pulses in the rate of change and delays of the geomagnetic field response to earthquakes with magnitudes Mw = 7–8 depending on the distance to the source. The results suggest that the geomagnetic effect is best detected in the rate of change recordings, reaching anomalous amplitudes of 10 nT/s. The signal delay is from 221 to 592 s depending on the magnetic field component and the distance to the epicenter, which for the selected observatories falls in the range from 765 to 2650 km.

About the authors

A. A. Soloviev

Geophysical Center of the Russian Academy of Sciences; Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences

Author for correspondence.
Email: a.soloviev@gcras.ru
Russia, Moscow; Russia, Moscow

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