Strong variations of cosmic ray intensity during thunderstorms and associated pulsations of the geomagnetic field

Strong variations of the intensity of secondary cosmic rays during thunderstorms are found to be accompanied in some cases by very clear pulsations of the geomagnetic field. The experiment is carried out in the Baksan Valley, North Caucasus, the Carpet air shower array being used as a particle detector. Magnetic field measurements are made with high-precision magnetometers located deep underground in the tunnel of the Baksan Neutrino Observatory, several kilometers apart from the air shower array.Comment: 8 pages, 2 figure

СЕЙСМОГРАВИТАЦИОННЫЕ ПРОЦЕССЫ, СОПРОВОЖДАЮЩИЕ ЭВОЛЮЦИЮ СЕЙСМОФОКАЛЬНЫХ СТРУКТУР ЛИТОСФЕРЫ

Observations reflecting the structure and conditions of the seismogravitational process in the lithosphere were analyzed using the data on the catastrophic tsunamigenic earthquake of Maule (Chile) [Sobisevich et al., 2019]. Seismogravitational processes were first identified by a group of Soviet scientists from the city of Leningrad (now St. Petersburg) under the leadership of Professor E.M. Linkov [Linkov et al., 1982, 1990]. The study of these processes continues at the North Caucasus Geophysical Observatory of IPE RAS, which was established in 2004. Experiments are carried out using unique quartz tiltmeters designed by D.G. Gridnev, which ensure the stable registration of long–period seismogravitational processes on the scale of the Earth [Sobisevich, 2013; Sobisevich et al., 2017].На примере катастрофического цунамигенного землетрясения Мауле (Чили) анализируются результаты обсерваторских наблюдений, отражающие структуру и условия формирования сейсмогравитационного процесса в литосфере [Sobisevich et al., 2019]. Показано, что сейсмогравитационные процессы были впервые выделены группой советских ученых из г. Ленинграда (ныне г. Санкт-Петербург) под руководством профессора Е.М. Линькова [Linkov et al., 1982, 1990]. Изучение этих процессов продолжается на базе Северокавказской геофизической обсерватории ИФЗ РАН, которая была развернута в 2004 г. В экспериментах задействованы уникальные кварцевые наклономеры системы Д.Г. Гриднева, которые обеспечивают устойчивую регистрацию длиннопериодных сейсмогравитационных процессов в масштабах Земли [Sobisevich, 2013; Sobisevich et al., 2017]

Anomalous geomagnetic disturbances induced by catastrophic tsunamigenic earthquakes in the region of Indonesia

Analysis of geomagnetic variations registered by the stations of the North-Caucasian geophysical observatory (the Elbrus volcanic area) has been fulfilled. Anomalous "quasi-harmonic" magnetic disturbances have been distinguished which were observed during all the stages of development of catastrophic tsunami-producing earthquakes in the area of Indonesia and morphologic effects in variation structure of geomagnetic field of the Earth have been described. Experimental results cited permit to obtain general idea on geomagnetic activity and some features of induced geomagnetic disturbances which we refer to tsunami-producing earthquakes. In all the observed cases seismic events occurred under the conditions of specific ratios between the components of magnetic field; it has been found that in the structure of magnetic variations we succeeded to distinguish ultra-low-frequency quasi-harmonic wave forms of geomagnetic disturbances reflecting the conditions of preparation and development of tsunami-producing earthquake in the studied region. We do not consider in the paper the forecast of tsunamiproducing earthquakes because even if we can distinguish in geomagnetic field some specific indications, in the source preceding the start of seismic event its coordinates and time in the source are left uncertain so far

SEISMOGRAVITATIONAL PROCESSES ACCOMPANYING THE EVOLUTION OF SEISMIC FOCAL STRUCTURES IN THE LITHOSPHERE

Observations reflecting the structure and conditions of the seismogravitational process in the lithosphere were analyzed using the data on the catastrophic tsunamigenic earthquake of Maule (Chile) [Sobisevich et al., 2019]. Seismogravitational processes were first identified by a group of Soviet scientists from the city of Leningrad (now St. Petersburg) under the leadership of Professor E.M. Linkov [Linkov et al., 1982, 1990]. The study of these processes continues at the North Caucasus Geophysical Observatory of IPE RAS, which was established in 2004. Experiments are carried out using unique quartz tiltmeters designed by D.G. Gridnev, which ensure the stable registration of long–period seismogravitational processes on the scale of the Earth [Sobisevich, 2013; Sobisevich et al., 2017]