Boguslawsky Crater on the Moon: Landing Site Selection for the <Emphasis Type="Italic">Luna–Glob</Emphasis> Mission Descent Module     

M. A. Ivanov  M. Ya. Marov  A. T. Basilevsky  Yu. A. Kostitsyn 《Solar System Research》2018,52(7):570-577

The article reviews the results of photo geological study of the lunar surface in terms of selection of most favorable landing sites from the point of view of science merit and safety for the Luna—Glob mission descent module.  相似文献   

Asteroid impact effects on Snowball Earth     

Christian Koeberl  Boris A. Ivanov 《Meteoritics & planetary science》2019,54(10):2273-2285

Several Snowball Earth periods, in which the Earth has been (almost) totally glaciated, are known from Earth history. Neither the trigger for the initiation, nor the reason for the ending of such phases, are well understood. Here we discuss some mechanical effects of the impact of asteroids 5–10 km in diameter on the Snowball Earth environment. An impact of this scale is the largest impact that is statistically predictable for 10–60 Myr time periods. The impact cratering itself (shock waves, impact crater formation) is not powerful enough to change the natural climate evolution path on Earth. However, the products of impact (mainly—water vapor) can be quickly distributed over a substantial part of the globe, influencing the global circulation (e.g., facilitating cloud formation). It is a question for future studies to confirm if such an event (which is possible statistically during this interval) may or may not have influenced the global climate of the Snowball Earth, and/or contributed to deglaciation.  相似文献   

Spatiotemporal Relationships of the Groove Belts,Coronal Structures,and Rift Zones of Venus     

Guseva  E. N.  Ivanov  M. A. 《Solar System Research》2019,53(6):411-422

Solar System Research - We have analyzed the spatial and age relationships of volcano-tectonic units that have developed on the surface of Venus: groove belts, coronae, and rift zones. Most of the...  相似文献   

Carbonatites and ultrabasic-alkaline rocks of the maimecha-kotui region, N. Siberia     

Leonid S. Egorov 《Lithos》1970,3(4):341-359

The structural position, geology, petrography, petrochemistry, and petrogenesis of one of the world's greatest carbonatite provinces situated in North Siberia are recorded. Three groups of Late Permian-Early Triassic magmatites are briefly discussed: effusives, dikes, and intrusives of complex central type. Carbonatite and congenetic rocks are related to kimberlites, but are genetically unrelated to tholeiitic basalts and trachybasalts. The genetic development and diagnostic features of ultrabasic-alkaline rocks and carbonatites are formulated.  相似文献   

Georadar Investigations of the Peretolchin Glacier (Southern Siberia)     

A. D. Kitov  E. N. Ivanov  V. M. Plyusnin  A. S. Gladkov  O. V. Lunina  E. V. Serebryakov  A. M. Afon’kin 《Geography and Natural Resources》2018,39(1):55-62

Presented are the results obtained from radar profiling of the Peretolchin glacier in the Munku-Sardyk mountain range in the south of Siberia (June 2014 and May 2016) using georadar OKO-2 with the ABDL Triton antenna unit operating at the radiation frequency of 50 and 100 MHz. The ice thickness was determined from the profiles and the ice volumes from the cross-sectional areas and distances between profiles. The ice volume was calculated for the body of the Peretolchin glacier to be 0.007 ± 0.0019 km³. An analytical method was also used to determine the ice volume according to the type and area of glacier. It is established that the correlation between the glacier volume and area is expressed by a power function V = kS ^p . The mean ice volume, calculated with due regard for different coefficients, was 0.0061 km³. The GlabTop model that assumes the cross-sectional form of the glacier was used to infer the ice volume: the mean volume for two cross-sections (parabolic and elliptic) was 0.0073 km³. It is found that over 110 years since the start of the investigation into the morphology of the Peretolchin glacier, it has increased twice in its length and in area, its volume has decreased by a factor of 3.7, and the lower boundary of the open part of the glacier has risen 184 meters during that period.  相似文献   

The dynamics of contemporary glaciers in the mountains of the south of East Siberia     

V. M. Plyusnin  E. N. Ivanov  A. D. Kitov  V. S. Sheinkman 《Geography and Natural Resources》2017,38(3):267-274

An analysis is made of the glaciation status of the mountains in the south of East Siberia to reveal a number of characteristics of changes in glacier systems. It is determined that the mountain systems are all experiencing a deglaciation caused by global climatic changes, while the rates of degradation have increased considerably since the late 1980s. It is established that over the last several decades the rate of thawing of glaciers has decelerated according to data for the key sites in the Kodar, Baikal’skii, Barguzin. Munku-Sardyk and Eastern-Sayan mountain ranges, which is associated with a decrease in mean annual air temperatures in 2009, 2010, 2012 and 2013 after the maximum values in 1990, 1994, 1995, 1997, 2002 and 2007. The changes recorded in the amount of solid atmospheric precipitation do not produce any definite trends in all of the mountain systems analyzed. It is determined that, given a relatively small snow accumulation, the glaciers are fed by snow avalanches and persist due to accumulation of large reserves of cold throughout long and cold winters which impede an intense ablation and promote the sustenance of glaciation. It is pointed out that the thawing of glaciers (especially cirque glaciers) involves a decrease in their thickness, whereas their area changes little.  相似文献   

Experimental evidence for flexibility of a building foundation supported by concrete friction piles     

M. D. Trifunac  S. S. Ivanov  M. I. Todorovska  E. I. Novikova  A. A. Gladkov 《Soil Dynamics and Earthquake Engineering》1999,18(3):375

This article explores the possibility to measure deformations of building foundations from measurements of ambient noise and strong motion recordings. The case under study is a seven-storey hotel building in Van Nuys, California. It has been instrumented by strong motion accelerographs, and has recorded several earthquakes, including the 1971 San Fernando (M_L=6.6, R=22 km), 1987 Whittier–Narrows (M_L=5.9, R=41 km), 1992 Landers (M_L=7.5, R=186 km), 1992 Big Bear (M_L=6.5, R=149 km), and 1994 Northridge (M_L=6.4, R=1.5 km) earthquake and its aftershocks (20 March: M_L=5.2, R=1.2 km; 6 December, 1994: M_L=4.3, R=11 km). It suffered minor structural damage in 1971 earthquake and extensive damage in 1994. Two detailed ambient vibration tests were performed following the Northridge earthquake, one before and the other one after the 20 March aftershock. These included measurements at a grid of points on the ground floor and in the parking lot surrounding the building, presented and analyzed in this article. The analysis shows that the foundation system, consisting of grade beams on friction piles, does not act as a “rigid body” but deforms during the passage of microtremor and therefore earthquake waves. For this geometrically and by design essentially symmetric building, the center of stiffness of the foundation system appears to have large eccentricity (this is seen both from the microtremor measurements and from the earthquake recordings). This eccentricity may have contributed to strong coupling of transverse and torsional responses, and to larger than expected torsional response, contributing to damage during the 1994 Northridge, earthquake.  相似文献   

Effect of Electron Precipitations on the Effective Recombination Coefficient     

Zh.?V.?DashkevichEmail author  V.?E.?Ivanov 《Geomagnetism and Aeronomy》2018,58(2):290-293

The results of an analysis of the possible effect of auroral electron fluxes on the effective recombination coefficient α_eff in the ionosphere are presented. It is shown that the α_eff value in the E-region of the ionosphere is determined mainly by the physical-chemical properties of the medium. In the F1-layer of the ionosphere, the effective recombination coefficient becomes dependent on both the value of the energy flux and the type of the energy spectrum of the auroral electron flux.  相似文献   

The Deep Hydrocarbon Cycle: From Subduction to Mantle Upwelling     

Kutcherov  V. G.  Dmitrievsky  A. N.  Ivanov  K. S.  Serovaiskii  A. Yu. 《Doklady Earth Sciences》2020,492(1):338-341

Doklady Earth Sciences - Experimental results and geological observations suggesting the existence of a deep hydrocarbon cycle are presented. During immersion hydrocarbons accumulated in the...  相似文献   

Approximate traveltime inversion in downhole microseismic monitoring     

Sergey Yaskevich  Anton A. Duchkov  Yuriy Ivanov 《Geophysical Prospecting》2020,68(3):918-925

In downhole microseismic monitoring, accurate event location relies on the accuracy of the velocity model. The model can be estimated along with event locations. Anisotropic models are important to get accurate event locations. Taking anisotropy into account makes it possible to use additional data – two S-wave arrivals generated due to shear-wave splitting. However, anisotropic ray tracing requires iterative procedures for computing group velocities, which may become unstable around caustics. As a result, anisotropic kinematic inversion may become time consuming. In this paper, we explore the idea of using simplified ray tracing to locate events and estimate medium parameters. In the simplified ray-tracing algorithm, the group velocity is assumed to be equal to phase velocity in both magnitude and direction. This assumption makes the ray-tracing algorithm five times faster compared to ray tracing based on exact equations. We present a set of tests showing that given perforation-shot data, one can use inversion based on simplified ray-tracing even for moderate-to-strong anisotropic models. When there are no perforation shots, event-location errors may become too large for moderately anisotropic media.  相似文献