The deep seismic structure of the Earth's crust along the Antarctic Peninsula—A summary of the results from Polish geodynamical expeditions

2014 ◽  
Vol 123 ◽  
pp. 213-222 ◽  
Author(s):  
Tomasz Janik ◽  
Marek Grad ◽  
Aleksander Guterch ◽  
Piotr Środa
2021 ◽  
Vol 43 (3) ◽  
pp. 205-226
Author(s):  
V. I. Starostenko ◽  
O. M. Rusakov ◽  
A. I. Yakimchik

The geological structure of the lithosphere of the main tectonic structures has been refined for the territory of Ukraine and adjacent regions of Slovakia, Poland, Romania, Russia, as well as Bulgaria, the Antarctic Peninsula (West Antarctica) and Southeast Asia, and new data have been obtained on geophysical impacts that can affect the environment. A geodynamic scenario has been developed for the formation of large-scale folding of the Fore- Dobrudzja Trough, the South Ukrainian monocline and the Ingul block of the Ukrainian Shield, caused by tectonic events associated with the closing of the Paleotethys and Neotethys oceans in the Mesozoic. In the Pripyat-Dnieper-Donets Basin, the structure of the earth’s crust and upper mantle can reflect different intensities of rifting, from its passive stage in the Dnieper Graben to active rifting in the Pripyat Trough. An analysis of the geoelectric structure of the Earth’s crust in the Ukrainian Eastern Carpathians indicates that seismic events occur mainly in resistive solid rock domainswhich surrounded by aseismic high conductive zones consisting of at least partially melted material. The present-day mutual position of the Ukrainian shield and Fennoscandia stabilized 1720—1660 Ma. The age, distribution, orientation and composition have been studied for the LatePalaeoproterozoicdykes in the Volyn, Ingul and Azov blocks of the Ukrainian Shield. Eastern Crimea and the Sorokin Trough are fragments of a tectonic wedge formed after the Paleocene. The geothermal conditions of the Intra-Carpathian region are due to subduction during the closure of the Pannonian sea basin and the collisional interaction of the Eurasian plate with the microplates system of this region. In Bulgaria, most earthquakes occur outside high-resistive domains. The tectonic stages are reconstructed for the formation of the northern part of the Antarctic Peninsula in the Mesozoic-Cenozoic. The relationship has been established between the geomagnetic field and climate change, with it being different for the Northern and Southern Hemispheres. The results have been obtained within the framework of 25 international projects and 6 temporary international target teams of S. I. Subbotin Institute of Geophysics, NAS of Ukraine consisting of researchers from 23 countries. The results are presented in 53 publications, 38 of which are indexed in the Web of Scienct database, and 32 papers are published in 20 international journals and special publications of 10 countries with different impact factors (from 0,101 to 4,214), whose average impact factor is 3,341, and the total one is 66,815.


1906 ◽  
Vol 3 (3) ◽  
pp. 120-124 ◽  
Author(s):  
Ernst H. L. Schwarz

In estimating the maximum load which pressed upon the northern type of Glacial (Dwyka) Conglomerate in Prieska, Cape Colony, I assumed that the calculations of Sir Wyville Thomson and Bernacci were correct, and that the greatest column of ice that could exist on the earth's surface was from 1,400 to 1,600 feet high. This limit, however, is by no means accepted by European glacialists, who, though they do not go as far as Dr. Croll in assuming thicknesses of 120,000 feet, yet see no reason why there could not have been ice-sheets 5,000 feet thick. The publication of Captain Scott's narrative of the voyage of the “Discovery” has given us certain definite data from the Antarctic which enable the case for the 1,600 feet maximum to be put with more confidence, and I will endeavour in the present paper to state the main lines of the argument. The question is of importance not only to us in South Africa with our two Palæozoic ice-ages, but to all geologists, as it affects the problem of the earth's equilibrium. To give a recent example, Professor Penck, in describing the Bodensee, discusses whether the weight of ice pouring down from the Alps in a sheet 3,600 feet thick may not have had some effect in producing a sinking in the earth's crust.


1994 ◽  
Vol 233 (3-4) ◽  
pp. 279-292 ◽  
Author(s):  
A.A. Ostrovsky ◽  
E.R. Flueh ◽  
U. Luosto

2019 ◽  
Vol 2 (2) ◽  
pp. 224-233
Author(s):  
Victor Solovyev ◽  
Alexander Salnikov ◽  
Viktor Seleznev ◽  
Vladimir Chechelnitsky ◽  
Nadezhda Gilyova ◽  
...  

An analyzing on the seismicity and the deep structure of Transbaikalia along the 1-SB profile is presented. Determined that areas of high seismicity associated with the blocks of the Earth's crust with a heterogeneous velocity structure. The site of the Baikal rift zone which is located in close proximity to the Muya earthquake (1957, M=7.6) is characterized by increased heterogeneity according to the values of P- and S-waves and of elastic parameters in the Earth’s crust upper part.


Author(s):  
V. M. Soloviev ◽  
◽  
A. S. Salnikov ◽  
V. S. Seleznev ◽  
T. V. Kashubina ◽  
...  

The materials of deep seismic operations on the Vostochno-Stanovoy fragment of the survey base geophysical profile 8-DV within large tectonic zones – the Selengino-Stanovoy and Amur fold regions of the Central Asian fold belt are presented. It is shown that longitudinal waves from the boundaries in the earth’s crust and the surface of Mohorovichich were recorded from explosions on a 700-kilometer geophysical profile. An inhomogeneous structure was established according to the data of longitudinal waves of the upper part of the earth’s crust to depths of 15–20 km and the surface of Mohorovichich. In general, the thickness of the earth’s crust at the profile is 37–42 km; the effective velocities of longitudinal waves in the crust and refractor ones along the mantle surface change at the profile, respectively, from 6.35 to 6.5 km/s and from 7.9 to 8.5 km/s. The results obtained are discussed and established features of the seismic structure are compared with the tectonics of the region and materials from other studies.


Author(s):  
Pavel O. Polyansky ◽  
◽  
Alexander F. Emanov ◽  
Alexandr S. Salnikov ◽  
◽  
...  

Digital processing of CDP–data, which are registered on North–East part of profile 3–DV, is done. Time sections which are result from method of head waves dynamic conversion were achieved for tectonic blocks are located at conjuction zone of Eurasian and Okhotomorskaya plates. Coefficients of refraction on the upper Earth’s crust were calculated based on frequencies difference between initial seismic traces and traces–results of processing. Seismic model of 0–2 km depth interval was constructed.


2009 ◽  
pp. 154-170
Author(s):  
V. M. Pavlovych ◽  
◽  
Yu. A. Bogdanov ◽  
V. M. Shuman ◽  
V.M. Vaschenko ◽  
...  

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