Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 41331 10.12737/stp-64202012 Results of current research Results of current research Results of current research Earthquakes and geomagnetic disturbances Earthquakes and geomagnetic disturbances Гульельми Анатолий Владимирович Guglielmi Anatol Vladimirovich guglielmi@mail.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Клайн Борис Ицикович Klain Boris Icikovich klain@borok.yar.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Куражковская Надежда Андреевна Kurazhkovskaya Nadezhda Andreevna knady@borok.yar.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Институт физики Земли им. О.Ю. Шмидта РАН Москва Россия Schmidt Institute of Physics of the Earth, RAS Moscow Russian Federation Геофизическая обсерватория «Борок» ИФЗ РАН Борок Россия Borok Geophysical Observatory of IPE RAS Borok Russian Federation Геофизическая обсерватория «Борок» ИФЗ РАН Борок Россия Borok Geophysical Observatory of IPE RAS Borok Russian Federation 6 4 80 83 https://zh-szf.ru/en/nauka/article/41331/view

The article addresses the problem of the connection of earthquakes with geomagnetic phenomena. We have carried out an experimental study using a method based, firstly, on the separation of periods of geomagnetic activity into extremely quiet and disturbed, and, secondly, on the description of seismic activity with an index called the global daily magnitude (GDM). By analyzing the NEIC earthquake catalog of the US Geological Survey over a 20-year period from 1980 to 1999, we have shown that the planetary activity of earthquakes under extremely quiet geomagnetic conditions is noticeably higher than under disturbed conditions. The detected tendency for seismic activity to increase in extremely quiet periods of geomagnetic activity has indirectly been confirmed by the analysis of 35 earthquakes with magnitude 8 and higher, which occurred on Earth from 1980 to 2019. We have found that in extremely quiet geomagnetic conditions, the probability of the occurrence of strong earthquakes is noticeably higher. The result qualitatively confirms the assumption of a change in the regime of seismic activity due to the influence of alternating magnetic fields on the ductility of rocks.

The article addresses the problem of the connection of earthquakes with geomagnetic phenomena. We have carried out an experimental study using a method based, firstly, on the separation of periods of geomagnetic activity into extremely quiet and disturbed, and, secondly, on the description of seismic activity with an index called the global daily magnitude (GDM). By analyzing the NEIC earthquake catalog of the US Geological Survey over a 20-year period from 1980 to 1999, we have shown that the planetary activity of earthquakes under extremely quiet geomagnetic conditions is noticeably higher than under disturbed conditions. The detected tendency for seismic activity to increase in extremely quiet periods of geomagnetic activity has indirectly been confirmed by the analysis of 35 earthquakes with magnitude 8 and higher, which occurred on Earth from 1980 to 2019. We have found that in extremely quiet geomagnetic conditions, the probability of the occurrence of strong earthquakes is noticeably higher. The result qualitatively confirms the assumption of a change in the regime of seismic activity due to the influence of alternating magnetic fields on the ductility of rocks.

 seismology geomagnetism Gutenberg-Richter law magnetic storms magnetoplasticity earthquake ensemble statistical sum entropy seismology geomagnetism Gutenberg-Richter law magnetic storms magnetoplasticity earthquake ensemble statistical sum entropy

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