Upper earth crust’s seismic structure on conjuction zone of Eurasian and Okhotomorskaya plates (according to head waves data)

2020 ◽  
Author(s):  
Pavel O. Polyansky ◽  
◽  
Alexander F. Emanov ◽  
Alexandr S. Salnikov ◽  
◽  
...  
Keyword(s):  
Digital Processing ◽  
Earth’S Crust ◽  
Depth Interval ◽  
Seismic Structure ◽  
Seismic Model ◽  
East Part ◽  
North East ◽  
Head Waves ◽  
Earth's Crust

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.

scholarly journals SEISMIC MODEL OF THE UPPER EARTH`s CRUST ON NORTH-EAST PART OF TRAVERSE 3-DV BASED ON RESULTS OF HEAD WAVES DIGITAL PROCESSING

2021 ◽  
Vol 2 (2) ◽  
pp. 225-233
Author(s):  
Pavel O. Polyansky ◽  
Alexander F. Emanov ◽  
Alexandr S. Salnikov
Keyword(s):  
Sedimentary Cover ◽  
Mineral Resources ◽  
Digital Processing ◽  
Velocity Model ◽  
Depth Interval ◽  
Tectonic Block ◽  
East Part ◽  
North East ◽  
Head Waves ◽  
Refracted Waves

Digital processing of refracted waves data, which are registered on North-East part of profile3-DV, is done. Time sections and velocity model are formed. It is proved, that refraction horizons on depth interval of 0-1.5 km are geologic boundaries in sedimentary cover on Ayan-Yuryakh tectonic block. Refraction boundary on depth of ~1.0 km is not lithologic border on Inyaly-Debin block. Layers, which are potentially productive for ore mineral resources, are substracted by low values of V/V (1.66-1.70) on depth below 1.0 km, on Inyaly-Debin block and Orotukan-Balygychan elevation.

scholarly journals IV.—The Glacial Deposits of Northern Pembrokeshire

1906 ◽  
Vol 41 (1) ◽  
pp. 53-87
Author(s):  
T. J. Jehu
Keyword(s):  
Igneous Rocks ◽  
Earth’S Crust ◽  
The West ◽  
Great Abundance ◽  
Glacial Deposits ◽  
North East ◽  
The North ◽  
Earth's Crust

The area embraced in this paper consists of that part of Pembrokeshire which lies to the north and north-east of St Bride's Bay. Bounded on the west by St George's Channel and on the north by Cardigan Bay, it extends to the north-east as far as the mouth of the river Teifi, near Cardigan.That part of the country which lies in the immediate neighbourhood of St David's has, through the laborious researches of the late Dr Hicks and others, become well-known to geologists, and may now be regarded as classic ground. The solid geology of this promontory has given rise to much discussion, and has, perhaps, attracted more attention than that of any other part of the Principality. The reason for this great interest is to be sought in the facts that the rocks of this area are of a very great antiquity, and that the sedimentary series contain the remains of some of the earliest organic forms yet found in the earth's crust, whilst the igneous rocks are also displayed in great abundance and variety, and present us, in the words of Sir Archibald Geikie, with “the oldest well-preserved record of volcanic action in Britain.”

Deep seismic structure of the Earth's crust along the Baltic Sea profile

1994 ◽  
Vol 233 (3-4) ◽  
pp. 279-292 ◽  
Author(s):  
A.A. Ostrovsky ◽  
E.R. Flueh ◽  
U. Luosto
Keyword(s):  
Baltic Sea ◽  
Earth’S Crust ◽  
Seismic Structure ◽  
The Baltic Sea ◽  
Earth's Crust ◽  
The Baltic

scholarly journals UPPER EARTH CRUST’S REFRACTION HORIZONS ON TRAVERSE 1-SB (TRANSBAIKALIAN PART)

2019 ◽  
Vol 2 (2) ◽  
pp. 11-18
Author(s):  
Pavel Polyansky ◽  
Alexander Emanov ◽  
Alexandr Salnikov
Keyword(s):  
Seismic Data ◽  
Digital Processing ◽  
Crystalline Basement ◽  
Depth Interval ◽  
Upper Crust ◽  
Intrusive Body ◽  
Fold Belt ◽  
Head Waves ◽  
Seismic Sections

Digital processing of seismic data, which are registered on Transbaikalian part of reference geophysical profile 1-SB, is executed. These data are registered on CDP source-receiver configuration. Time sections images and wavefields of P- and S- head waves are result from technique of head waves dynamic conversion. These time sections are image a structure of refraction boundaries on the upper Earth crust on some areas of Argunskaya fold area, Mongol-Okhotsky fold belt, West-Stanovaya and Selengino-Yablonevaya fold areas. Seismic sections of depth interval of 0-2 km are constructed. Boundaries of intrusive body are detected on upper crust of Argunskaya fold area. This body is underlying lens shaped sedimentary layers on depth interval of 0.5÷1.0 km. Top of crystalline basement is established on the depth interval of 1.6-2.0 km on the northern part of Mongol-Okhotsky fold belt.

scholarly journals ANALYSIS OF THE DEEP SEISMIC STRUCTURE AND SEISMICITY OF THE TRANSBAIKALIA (ALONG THE 1-SB PROFILE)

2019 ◽  
Vol 2 (2) ◽  
pp. 224-233
Author(s):  
Victor Solovyev ◽  
Alexander Salnikov ◽  
Viktor Seleznev ◽  
Vladimir Chechelnitsky ◽  
Nadezhda Gilyova ◽  
...  
Keyword(s):  
Rift Zone ◽  
Velocity Structure ◽  
Deep Structure ◽  
Baikal Rift Zone ◽  
Earth’S Crust ◽  
Seismic Structure ◽  
Elastic Parameters ◽  
S Waves ◽  
Close Proximity ◽  
Earth's Crust

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.

scholarly journals THE SPEED CHARACTERISTICS OF THE EARTH'S CRUST OF THE KOROSTEN PLUTON (UKRAINIAN SHIELD) ACCORDING TO THE DATA OF DEEP SEISMIC SOUNDING METHOD

2018 ◽  
pp. 46-50
Author(s):  
Y. Rozyhan ◽  
O. Trypilskiy ◽  
O. Topoliuk
Keyword(s):  
Short Interval ◽  
Earth’S Crust ◽  
Ukrainian Shield ◽  
Depth Interval ◽  
Basic Composition ◽  
Rate Of Increase ◽  
Seismic Sounding ◽  
Abrupt Changes ◽  
Earth's Crust ◽  
Basic Rocks

A detailed comparative analysis of the velocity characteristics of the Earth's crust of the Korosten pluton, Volyn and Chopovitsky massifs of the basic rocks of the Volyn megablock of the Ukrainian Shield was carried out. In the interval of depths of 3–13 km in the Earth's crust of the Korosten pluton, five sections are fixed, where the speed on a short interval first decreases with depth, then, on the contrary, increases. This is due to the presence in the section of a series of layers composed of rocks with reduced or elevated speeds, which alternate with increasing depth. Such changes in velocity are considered to be the results of alternation of rocks of the basic and acidic composition. With depth, the rate of increase in velocity (vertical velocity gradient), which characterizes the features of rooting into the crust of an intrusion with increased basicity, significantly decreases. These features lie in the fact that the molten masses coming from the upper mantle were concentrated mainly in the upper and middle parts of the Earth's crust. The distinction between the features of the speed characteristics of the Earth's crust of the Volynsky and Chopovitsky massifs of the main rocks is revealed. The velocity characteristics of the compared structures reflect the characteristics of the rooting of igneous melts of the basic composition into the Earth's crust. Despite the territorial proximity of the massifs, the nature of the rooting of the melts between them is significantly different. For example, abrupt changes in velocity in the depth interval of 0–12 km of the Volynsky massif can be attributed to the presence of, at least, 10 layers of rocks, predominantly of acidic and basic composition, which alternate each other. It should be emphasized that at depths of 8–12 km maximum speeds (up to 0.17–0.18 km/s) between individual layers are observed. In the same depth interval in the Chopovitsky massif, only 5 layers stand out with a maximum differential velocity of 0.18 km/s.

DEPTH STRUCTURE FEATURES OF THE EASTERN STANOVOY FRAGMENT OF THE 8-DV GEOLOGICALGEOPHYSICAL SURVEY – BASE LINE (ACCORDING TO THE DSS DATA)

2020 ◽  
pp. 29-39
Author(s):  
V. M. Soloviev ◽  
◽  
A. S. Salnikov ◽  
V. S. Seleznev ◽  
T. V. Kashubina ◽  
...  
Keyword(s):  
Earth’S Crust ◽  
Base Line ◽  
Seismic Structure ◽  
Fold Belt ◽  
Longitudinal Waves ◽  
Surface Change ◽  
Central Asian ◽  
Tectonic Zones ◽  
Earth's Crust ◽  
Dss Data

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.

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