Vulkanologiâ i sejsmologiâ

Journal of Volcanology and Seismology is an international peer-reviewed journal that publishes theoretical and experimental studies, communications, and reports on volcanic, seismic, geodynamic, and magmatic processes occurring in the areas of island arcs and other active regions of the Earth. In particular, the journal looks at present-day land and submarine volcanic activity; Neogene–Quaternary volcanism; mechanisms of plutonic activity; the geochemistry of volcanic and postvolcanic processes; geothermal systems in volcanic regions; and seismological monitoring. In addition, the journal surveys earthquakes, volcanic eruptions, and techniques for predicting them. The journal welcomes manuscripts from all countries.

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Vol 17, No 3 (2023)

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Petrophysical and Strength Properties of Extrusive Rocks of the Bezymianny Volcano, Kamchatka
Ladygin V.M., Girina O.A., Frolova Y.V.

For the first time, the results of petrophysical studies of the Bezymianny volcano extrusive rocks from dacites to andesites are presented. A comparative characteristic of the extrusive rocks properties is given according to the selected age groups. The dynamics of changes in the properties of extrusion rocks depending on their age is shown: it is established that the older the rocks, the higher the indicators of their density, strength and elastic properties. The petrophysical features of the rocks of the extrusive domes and lava flows are compared. The applicability of petrophysical properties to clarify the genesis of rocks similar in petrographic characte-ristics, in particular, of extrusive and effusive origin, is substantiated.

Vulkanologiâ i sejsmologiâ. 2023;17(3):3-20
pages 3-20 views
Three-Dimensional Numerical Modeling of Lava Dynamics Using the Smoothed Particle Hydrodynamics Method
Starodubtsev I.S., Starodubtseva Y.V., Tsepelev I.А., Ismail-Zadeh A.T.

Lava domes and lava flows are major manifestations of effusive volcanic eruptions. Less viscous lava tends to flow long distances, depending on the volcanic slope topography, the eruption rate, and the viscosity of the erupted magma. When magma is highly viscous, its eruption to the surface leads to the formation of lava domes and their growth. The meshless smoothed particle hydrodynamics (SPH) method is used in this paper to simulate lava dynamics. We describe the SPH method and present a numerical algorithm to compute lava dynamics models. The numerical method is verified by solving a model of cylindrical dam-break fluid flow, and the modelled results are compared to the analytical solution of the axisymmetric thin-layer viscous current problem. The SPH method is applied to study three models of lava advancement along the volcanic slope, when the lava viscosity is constant, depends on time and on the volume fraction of crystals in the lava. Simulation results show characteristic features of lava flows, such as lava channel and tube formation, and lava domes, such as the formation of a highly viscous carapace versus a less viscous dome core. Finally, the simulation results and their dependence on a particle size in the SPH method are discussed.

Vulkanologiâ i sejsmologiâ. 2023;17(3):21-33
pages 21-33 views
The History of Formation of Pliocen-Quaternary Valley Lava Rivers in the Northeast Part of the Javakheti Volcanic Highland (Lesser Caucasus)
Parfenov A.V., Lebedev V.A., Vashakidze G.T., Yakushev A.I., Ediberidze B.D.

The article presents new results of geological-stratigraphic and isotope-geochronological study of young lavas in the northeast part of the Javakheti Highland (Lesser Caucasus, Republic of Georgia). A valley lava river (Algeti flow) with a complex structure and total length about 55 km was described for the first time (no information about this valley lava river was previously published in the scientific literature). It was shown that a young magmatism in the northeast of the Javakheti area developed in the time interval of 3.2–1.5 Ma. Its early phase (3.19 ± 0.10 Ma) was marked by the formation of the longest (up to 100 km) valley lava river (Khrami flow), composed of basalts, among the similar geological objects known in the Lesser Caucasus. Subsequently (2.7–2.5 Ma), the continuation of eruptions led to the formation of extensive lava plateaus in the region (Tsalka, Gomareti and others). The formation of the Algeti valley lava river (Algeti flow), composed of basaltoids, began from the end of Piacenzian and continued over ~1 m.y. until the beginning of Gelasian (2.7–2.0 Ma) as a result of the activity of volcanoes in the northern part of the Javakheti Range. The final stage of formation (1.9–1.5 Ma) of Algeti flow was likely associated with eruptions of volcanic cones near Tabatskuri Lake. The obtained data, along with the reconstruction of the history of young magmatism, made it possible to follow the main features in the formation of modern relief and the river valley system in the considered part of the Lesser Caucasus.

Vulkanologiâ i sejsmologiâ. 2023;17(3):34-58
pages 34-58 views
Model of a New Peripheral Near-Surface Magmanic Chamber of the Elbrus Volcanic Center
Milyukov V.K., Myasnikov A.V.

Intracrustal magmatic structures have pronounced resonant properties, due to which these structures are able to generate secondary seismic waves at their own frequencies. Based on strain data obtained with a 75-meter laser interferometer ‒ strainmeter, resonance modes are identified and parameters of magmatic structures of the Elbrus volcanic center are estimated. Such resonant modes are unique for each magmatic formation and determine the size and physical-mechanical properties of this magmatic structure. This paper analyzes the local formation, which manifested itself as a some compact area of numerous weak seismic pulses registered in the Elbrus region by the seismometers of the Geophysical Service of the Russian Academy of Sciences in 2011. The results of studies based on seismic and strain data, as well as the results of microseismic sounding, showed the presence of a new peripheral near-surface magmatic chamber in the Elbrus volcanic center. The characteristic size of this new magmatic chamber is 2.5‒3 km.

Vulkanologiâ i sejsmologiâ. 2023;17(3):59-68
pages 59-68 views
Retrospective Prediction of the Location and Intensity of Two Strong Crustal Earthquakes in Iran And India
Morozov V.N., Manevich A.I., Tatarinov V.N.

The paper presents the results of mathematical modeling of the stress-strain state of the epicentral zone before and after the strong earthquakes Mw = 6.4 of June 22, 2002 in the north-west of Iran in the region Qazvin and 26 January 2001 in India with M = 6.9. The method of modeling of the stress-strain state of the block elastic-isotropic heterogeneous medium disturbed by the system of faults under the influence of the external field of tectonic stresses was used, boundary conditions were set according to seismological data. It is shown that at a certain ratio between the main stresses the epicenters of strong cow earthquakes are localized in the area of high concentration of stress intensity. The development of aftershock process is caused by stress release caused by a new break, and the emerging clusters of aftershocks spatially correlate with the zone of released intensity of stresses. It is assumed that the tectonic rupture propagates in the direction of the zones of high intensity of stresses. The actual correlation between the rupture length and the earthquake magnitude from the accumulated elastic energy and its possible realization under given structural and tectonic conditions is shown.

Vulkanologiâ i sejsmologiâ. 2023;17(3):69-78
pages 69-78 views
pages 79-80 views

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