The correlation between solar activity and global seismicity in 1680-2012 was studied. The authors discovered the global cycles of seismicity of the Earth, related to solar activity. They observed the solar cycles with a small number of spots, typical for the beginning of secular cycles, and strong seismic activity, which remained high throughout several decades. The scientists established a significant negative correlation between seismicity and solar activity. They revealed an absolute maximum of global seismic activity in the 20th century and discovered spatial-temporal regularities of manifestations of global seismicity. Experiments, which were simultaneously carried out at the Pushkov Institute of Geomagnetism, Ionosphere and Radiowave Propagation (IZMIRAN), Russian Academy of Sciences, Moscow and the Kamchatka Branch of Geophysical Survey, Russian Academy of Sciences, have verified the suggestion that neutron generation occur during the early stages of strong earthquakes. It was supposed that the mechanism of primary generation of terrestrial neutrons is related to nuclear reactions in the Earth's interior. The authors suggested to use an increase of streams of particles before an earthquake for its forecasting. For this purpose it is necessary to install devices for registration of thermal and fast neutrons in several active zones in the Earth's Northern and Southern hemispheres.
The main functions of the centers according to the "Guide to the WDC System" are to collect, manage, and archive geophysical data on the underlying principles of long-term secure preservation, assurance of the quality of scientific data, and provision of free and open access to all data for scientific research.The WDCs for STP and SEP store and disseminate national and foreign multidisciplinary data. The information resources of the WDCs include modern and historical results of global observations related to a wide range of geophysical disciplines obtained during the International Geophysical Year and subsequent international projects, results of geophysical observations on global observation networks and during special experiments and expeditions.Along with providing access to data stored in their archives, the WDCs serve as an information and reference node offering links for information on other data centers and data providers that possess interesting data sets and databases. The centers are targeted by scientific organizations, separate researchers, universities, and students in different fields of science both in Russia and abroad.
The paper presents some results of long-term studies of the association of seismicity of the Earth with solar activity using the database Word Data Centers for the solar activity and seismicity of the Earth.
As a result of ground measurements of a) thermal and fast neutrons, carried out at the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences (IZMIRAN), Moscow; b) thermal neutrons, carried out at the Karymshina Complex Geophysical Observatory, Kamchatka Branch, Geophysical Survey, Russian Academy of Sciences, near Petropavlovsk-Kamchatsky in 2010-2012, neutron fluxes were registered, related to earthquakes in Chile, Japan, Indonesia. The magnitude of these earthquakes was = 8.6 − 9. Fluxes of neutrons were also registered during the volcanic eruption in Iceland in 2010. In 2013-2015 bursts of neutron fluxes were registered, not only by the instrumental complex with helium counters, i.e. with an energy of several MeV, but also by neutron monitors with threshold energy of 20-30 MeV. We can assume that the emergence of neutrons on the surface of the Earth is related to nuclear reactions in the Earth's interior, generating a variety of particles with high penetrating capacity.KEYWORDS: Thermal and fast neutrons; generation of neutrons; nuclear reactions; neutron monitors; seismicity and volcanism of the Earth.
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