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Search Results: 1 - 10 of 168 matches for " Vsevolod Yutsis "
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Southward Migration of Magmatic Activity in the Colima Volcanic Complex, Mexico: An Ongoing Process  [PDF]
Román Alvarez, Vsevolod Yutsis
International Journal of Geosciences (IJG) , 2015, DOI: 10.4236/ijg.2015.69085
Abstract: The Colima Volcanic Complex trends in a nearly N-S direction in western Mexico, and one of itsstructures, Colima volcano, is the most historically active volcano in the country. Immediately to theN, there is another volcanic center called El Cántaro volcano, whose activity started around 1.7 Ma in its N portion and migrated to the S in various episodes. Volcanic activity migrated further south, from El Cántaro to the Colima Volcanic Complex where the southernmost manifestation, Hijos del Volcán domes, is located on the south slope of Fuego volcano. The above date appears to mark initiation of the rather continuous volcanic activity in the area. It has been noted that these volcanic manifestations lie on, or near the Rivera-Cocos inland plate boundary. Colima’s Fuego volcano is also the closest to the Middle America Trench, among the polygenetic volcanoes in Mexico. We submit that the anomalous location of volcanism in this area originates in an anomalous subduction process of the Rivera and Cocos plates and evoke a tectonic model, proposed elsewhere, to support the idea. Modeling gravimetric and aeromagnetic data we locate the magma chambers of the Fuego (active) and Nevado (extinct) volcanoes within a 65 mGals negative Bouguer anomaly elongated in a nearly N-S direction. The corresponding aeromagnetic map displays a magnetic high over the southern portion of the Fuego volcano edifice. We found two additional, associated structures whose anomalies have not been previously reported, which appear to follow the southward magmatic migration pattern. One of them is a collapse structure with a circular topographic expression, and the southernmost is a low-density intrusion ~1 km below sea level, associated with a moderate topographic bulge at the surface that we interpret as a magma body. Five lines cross the anomalies; gravimetric and magnetic fields are concurrently modeled along them to locate the magmatic bodies. In addition to the 2-D models we perform 3-D gravimetric and magnetic inversions. For each field a 3-D mesh is built under the area occupied by the Colima Volcanic Complex, the volume elements are then assigned density or magnetic susceptibility values and their surface contributions in various points are evaluated. The process is
Paleozoic Exotic Blocks of the Crimean Mountains: Stratigraphy and Origin  [PDF]
Vsevolod V. Yutsis, Alexander N. Stafeev, Tatiana V. Sukhanova
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.48028
Abstract:

Based on numerous geological data obtained by the authors for several decades, the stratification of Permian and Carboniferous ancient and exotic blocks of Crimean Mountains is performed. The sequence of geological events that cause their origin is revealed. Carnian-Norian, Rhaetian-Hettangian and Early-Pliensbachian phases of collapse, sliding and burial of Paleozoic blocks are specified. Final stage (block re-deposition) is confined to the Toarcian and Aalenian ages. The data obtained allow re-interpreting the origin of ancient exotic blocks of the Crimea.

Detailed Study of Radon Spatial Anomaly in Tlamacas Mountain Area, Volcano Popocatepetl, Mexico  [PDF]
Anatolyi Kotsarenko, Vsevolod Yutsis, Vladimir Grimalsky, Svetlana Koshevaya
Open Journal of Geology (OJG) , 2016, DOI: 10.4236/ojg.2016.63015
Abstract: Results of a soil radon survey accomplished by 2 different methods during 2 different periods in the area of Tlamacas Mountain are presented. The first study, carried out from 15-APR-2010 to 09-MAY-2010 in 30 measurement sites by means of CR39 solid state nuclear detectors, shows 2 active zones with intensive radon emanation with a characteristic dimension of about 300 meters located in the northwestern and western parts of the Mountain. The second survey, made on 05-JUL-2011 in 23 measurement sites with 10 min sampling by a SARAD RTM 1688 Radon/Thoron monitor, in contrast, revealed a sizeable area depleted in radon and 3 active areas of increased radon release in the lateral Mountain sides. These observed phenomena strengthen our assumption about the presence of an active geological structure in Tlamacas Mountain connected with a geodynamical processes in volcano Popocatepetl.
Gravity Field Variations Associated with the Buried Geological Structures: San Marcos Fault (NE Mexico) Case Study  [PDF]
Vsevolod Yutsis, Yaneth Quintanilla-López, Konstantin Krivosheya, Juan Carlos Montalvo-Arrieta, Gabriel Chávez-Cabello
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.329160
Abstract: Gravity data are sensitive to local vertical offsets across high-angle faults, where rocks with different densities are juxtaposed. Yet high densities in some Mesozoic sedimentary rocks just above the basement may smear out the subtle gravity signatures of basement faults. At this study the gravity data processing tends to avoid ill-described “black-box” techniques. The study area is situated in the Palomas site, Cuatrociénegas region, Coahuila, NE Mexico. The San Marcos Fault is at least 300 km long and has WNW-ESE trend from the central part of Nuevo León State through Coahuila, and finally to the eastern part of Chihuahua State. Gravimetric data shows that the lowest values of free air and Bouguer anomalies are in the southern part of the area, and the highest values are in the western and central part of the area. Between these parts exists a zone of high horizontal gravity gradient. Configuration of linear elements of gravity field (gradient zones) delimited the San Marcos Fault in the San Marcos valley below thickness of recent sedimentary cover. Two density models were carried out, which showed that the Cretaceous rocks are in discordant contact with the Paleo- zoic rocks that can be related to the San Marcos Fault. The density was determinate using to Nettleton’s method, which results highlight the presence of the San Marcos Fault. Density models showed that the Quaternary sediments are in direct contact with the San Marcos Fault.
Experimental studies of anomalous radon activity in the Tlamacas Mountain, Popocatepetl Volcano area, México: new tools to study lithosphere-atmosphere coupling for forecasting volcanic and seismic events
Anatoliy Kotsarenko,Vladimir Grimalsky,Vsevolod Yutsis,Ana Gabriela Bravo Osuna
Annals of Geophysics , 2012, DOI: 10.4401/ag-5318
Abstract: This study presents and discusses the results of soil radon monitoring at three different volcano sites and one reference site, from December 2007 to January 2009. This relates to the activity of the Popocatepetl Volcano and a radon survey and gamma-ray spectrometry in the area between Paso de Cortes and Tlamacas Mountain, and in the adjacent regions. The results are applied to the aspects of atmosphere electricity and lithosphere-atmosphere coupling in relation to the forecasting of volcano and earthquake activity. The monitoring of radon release reveals a decrease in radon concentration (down to total suppression) with approaching moderate volcanic eruptions. The behavior of the radon activity at the Tlamacas site is more apparent, compared to other observational sites. The average level of radon release observed at the Tlamacas site is much higher, with some characteristic variations. Both the radon survey and gamma-ray spectrometry indicate intensive diffusion radon emission localized in the area of Tlamacas Mountain. The average radon concentration in the area of Tlamacas is about 10-20-fold greater than the background volcano values. The new concept of lithosphere-atmosphere coupling is presented: intensive radon release in high elevated areas shortens and modifies the Earth-to-thunderclouds electric circuit, which provokes microdischarges into the air close to the ground, attracting lightning discharges. This concept attempts to explain in a new way the noise-like geomagnetic emissions registered before major earthquakes, and it promotes interest for the study of thunderstorm activity in seismo-active zones, as a promising instrument for earthquake forecasting.
Rasgos tectónicos de la Cuenca de La Popa y de las estructuras que la rodean en el noreste de México derivados de campos geofísicos potenciales
Tamez Ponce, Antonio;Yutsis, Vsevolod;Krivosheya, Konstantin;Hernández Flores, Edilberto Román;Bulychev, Andrey A.;Tamez Vargas, Antonio;
Boletín de la Sociedad Geológica Mexicana , 2011,
Abstract: in this work, the integral analysis of gravity and aeromagnetic data in the la popa basin and the adjacent geologic structures is presented. the analysis was complemented with a digital model of elevations that, combined with the review of previous geological studies, served to compare the surface structures and basement blocks in the study area. the most important tectonic blocks were distinguished and finally two 2.5d geological-geophysical models were developed. these models represent in a general way the most important structural characteristics of the northeast of mexico.
Geophysical modeling of Valle de Banderas graben and its structural relation to Bahia de Banderas, Mexico
Arzate, Jorge A.;álvarez, Román;Yutsis, Vsevolod;Pacheco, Jesús;López-Loera, Héctor;
Revista mexicana de ciencias geológicas , 2006,
Abstract: a gravimetric survey consisting of five lines and 483 stations, as well as a magnetotelluric (mt) survey consisting ofl 7 observation sites, were made in the valle de banderas region for the determination of the structural characteristics of the valley. additionally, data from a previous aeromagnetic survey were analyzed to correlate them with our geophysical measurements. the gravimetric and mt models confirm that the valley corresponds to a graben structure with slumped blocks that vary from 2000 m deep close to bahía de banderas to shallow burial depths (100 m) toward the ne end of the valley. faults flanking the valley, inferred from the gravity and magnetic models, trend toward offshore faults in bahía de banderas, indicating a structural connection between land and sea. from the mt measurements we conclude that a 2-d resistivity behavior is observed within the graben whereas outside of the graben the behavior is 1-d, in spite of the rough topography of this region. our gravimetric models also indicate the occurrence of basin-like structures within the graben, coinciding with similar structures reported offshore in the bahía de banderas, suggesting that such structures may be typical erosional features of the graben. the aeromagnetic analysis correlates with the gravimetric and mt models, and suggests that the graben structure is an extensional zone on granitic crust; it also indicates that the extensional zone continues to the ne, beyond the topographic limits of valle de banderas on land and towards bahía de banderas seawards. we propose that this region belongs to the same tectonic structure in spite of an approximate change in orientation of 30° between the bay and the valley, and strengthen the idea that this graben constitutes part of the nw limit of the jalisco block. a tectonic model for the region is presented at various stages, from around 100-75 ma to the present. we propose that initiation of the bahía de banderas structure started at 14 ma along an
Observational Evidences for Extremely Strong Magnetic Fields in Solar Flares  [PDF]
Vsevolod Gryhorovych Lozitsky
International Journal of Astronomy and Astrophysics (IJAA) , 2011, DOI: 10.4236/ijaa.2011.13019
Abstract: New observational data related to the X1.1/2N solar flare of 17 July 2004 were investigated and compared with some old data for other powerful flares and non-flare regions. Observations were carried out with the Echelle spectrograph of the Kyiv University Astronomical Observatory. The Stokes I ± V profiles of several metallic lines with different effective Lande factors geff have been analyzed including the FeI 5434.5 line with very low magnetic sensitivity (geff = –0.014). The obvious evidences of the emissive Zeeman effect were found as in lines with great and middle Lande factors as in FeI 5434.5 line. On the basis of all analyzed data one can conclude that upper magnetic field limit in flares can reach 70 - 90 kG, i.e. about more order higher than the well-known magnetic fields in great sunspots. The possible physical nature of such superstrong fields is discussed.
Hispanismo en Rusia y en los Países del Este: Adonde va, de dónde viene
Bagno, Vsevolod
Arbor : Ciencia, Pensamiento y Cultura , 2001,
Abstract: Not available No disponible
Wave patterns within the generalized convection-reaction-diffusion equation
Vsevolod Vladimirov
Physics , 2009,
Abstract: A set of travelling wave solutions to a hyperbolic generalization of the convection-reaction-diffusion is studied by the methods of local nonlinear alnalysis and numerical simulation. Special attention is paid to displaying appearance of the compactly supported soloutions, shock fronts, soliton-like solutions and peakons
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