Pulse induction soundings in the area of the “Crystal” underground nuclear explosion

2020 ◽  
Author(s):  
Vladimir V. Potapov ◽  
◽  
Evgeniy Yu. Antonov ◽  
Alexandr N. Shein ◽  
Svetlana Yu. Artamonova ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Measurement Technique ◽  
Nuclear Explosion ◽  
Field Studies ◽  
Underground Nuclear Explosion ◽  
Geological Environment ◽  
Transient Electromagnetic ◽  
High Information Content ◽  
Tem Method ◽  
High Information

The paper presents the results of geophysical studies using the method of transient electromagnetic field (TEM) in the area of the «Crystal» underground nuclear explosion in 2008 and 2019. The measurement technique and signal differences in different years related to the noise situation at the site of work are described in detail. Geoelectric sections constructed from the results of field studies show the high information content of the TEM method in the study of Yakutia and can be used to study the effect of the «Crystal» underground nuclear explosion on the geological environment.

scholarly journals THE HALL EFFECT DETECTION STUDIES IN THE GEOLOGICAL ENVIRONMENT (THE RATIONALE OF REPEATED EXPERIMENTS)

2019 ◽  
Vol 2 (2) ◽  
pp. 87-94
Author(s):  
Vladimir Gurev ◽  
Vladimir Mogilatov ◽  
Vladimir Potapov
Keyword(s):  
Field Experiment ◽  
Hall Effect ◽  
Field Work ◽  
Field Studies ◽  
Hall Conductivity ◽  
Theoretical Studies ◽  
Geological Environment ◽  
Controlled Source ◽  
Transient Electromagnetic ◽  
Tem Method

This work is devoted to identifying the influence of the Hall effect in the geological environment on the electrical exploration methods data on the example of controlled source transient electromagnetic (TEM) method. It summarizes the results of previous theoretical studies, as well as the results of the summer field work in 2018 and the authors' recommendations for further field studies planned for the summer of 2019. Much attention is paid to the aspects of the field experiment, as well as the conditions of its correctness. The estimation of the Hall conductivity on the basis of already available results is given.

scholarly journals THE ELECTROTOMOGRAPHY SURVEY IN DIFFICULT GEOTECHNOGENIC CONDITIONS AT THE PEACEFUL UNDERGROUND NUCLEAR EXPLOSION "CRYSTAL" SITE

2021 ◽  
Vol 2 (3) ◽  
pp. 61-68
Author(s):  
Alexandr N. Shein ◽  
Svetlana Yu. Artamonova ◽  
Vladimir V. Potapov ◽  
Nickolay O. Kozhevnikov ◽  
Vladislav E. Ushnitskii
Keyword(s):  
Electrical Resistivity ◽  
Carbonate Rocks ◽  
Nuclear Explosion ◽  
Forward Modeling ◽  
Measured Data ◽  
Underground Nuclear Explosion ◽  
Geological Environment ◽  
Two Dimensional ◽  
Data Inversion ◽  
Significant Interference

The paper presents the results of measurements in 2019 by electrotomography at the site of the emplacement hole of the peaceful underground nuclear explosion "Crystal", carried in 1974 at a depth of 98 m in permafrost Cambrian carbonate rocks, and the neighboring forest area. The fence made of metal poles and barbed wire around the site, and the buried fragments of the casing of the emplacement hole create significant interference of measurements. To avoid the electromagnetic noise, the measured data of the apparent electrical resistivity was cleaned manually. Data inversion was performed in the Res2Dinv program. Geoelectric models, namely two-dimensional sections of the upper part of the geological environment to a depth of up to 80 m, were obtained. To verify the models, forward modeling was performed using the ZondRes2D program.

Magnetic survey at the "Crystal" site in 2019

2020 ◽  
Author(s):  
Alexandr N. Shein ◽  
◽  
Polina N. Novikova ◽  
Svetlana Yu. Artamonova ◽  
Vladimir V. Potapov ◽  
...  
Keyword(s):  
Nuclear Explosion ◽  
Geophysical Methods ◽  
Underground Nuclear Explosion ◽  
Magnetic Survey ◽  
Geological Environment

The paper discusses the results of magnetic survey over the site of the "Crystal" underground nuclear explosion, which indicated that large metal objects are buried under the sarcophagus. These results will help in interpreting data of other geophysical methods used here to study the effect of the underground nuclear explosion on the geological environment.

Study on Effect of Transient Electromagnetic Field on Growth of Radish

2019 ◽  
Vol 139 (10) ◽  
pp. 461-462
Author(s):  
Yuki Haji ◽  
Yoshihisa Otsuki ◽  
Masao Masugi
Keyword(s):  
Electromagnetic Field ◽  
Transient Electromagnetic

Modern Radiodiagnostics Technology of Metastasises in Pelvic Lymph Nodes

2017 ◽  
pp. 100-108
Author(s):  
V. N. Diomidova ◽  
O. A. Еfimova
Keyword(s):  
Lymph Node ◽  
Magnetic Resonance ◽  
Lymph Nodes ◽  
Metastatic Lymph Node ◽  
Magnetic Resonance Tomography ◽  
Visual Images ◽  
Pelvic Lymph Nodes ◽  
High Information Content ◽  
Pelvic Cancer ◽  
High Information

The analysis of the diagnostic informativeness of modern radiodiagnosticis methods in determining metastatic lymph node of pelvic cancer gynecological organs according to domestic and foreign publications. At the present stage methods of obtaining visual images pelvic lymph nodes are radiodiagnostics technologies (radiological, ultrasound, magnetic resonance tomography, scintigraphic). The analysis has shown that the researches devoted to diagnostic informational content of modern methods of radiodiagnosis in a differentiation of nature of damage of pelvic lymph nodes aren't enough. According to the literature, the most rational and perspective method for radiodiagnosis metastatics lymph node is a magnetic resonance imaging due to the high information content and thus specificity. At the same time, the continued relevance of further study of methods of radiodiagnostics in order to find the optimal one for the assessment of pelvic lymph nodes.

Geologic effects of the Rainier underground nuclear explosion : a summary progress report of U.S. Geological Survey investigations

1959 ◽  
Author(s):  
William H. Diment ◽  
V.R. Wilmarth ◽  
R.E. Wilcox ◽  
Alfred Clebsch ◽  
G.E. Manger ◽  
...  
Keyword(s):  
Nuclear Explosion ◽  
Progress Report ◽  
Geological Survey ◽  
Underground Nuclear Explosion

The use and misuse of apparent resistivity in electromagnetic methods

Geophysics ◽  
1986 ◽  
Vol 51 (7) ◽  
pp. 1462-1471 ◽  
Author(s):  
Brian R. Spies ◽  
Dwight E. Eggers
Keyword(s):  
Apparent Resistivity ◽  
Early Time ◽  
Asymptotic Formulas ◽  
Voltage Response ◽  
Late Time ◽  
Induced Voltage ◽  
Resistivity Curve ◽  
Transient Electromagnetic ◽  
Electromagnetic Methods ◽  
Tem Method

Problems and misunderstandings arise with the concept of apparent resistivity when the analogy between an apparent resistivity computed from geophysical observations and the true resistivity structure of the subsurface is drawn too tightly. Several definitions of apparent resistivity are available for use in electromagnetic methods; however, those most commonly used do not always exhibit the best behavior. Many of the features of the apparent resistivity curve which have been interpreted as physically significant with one definition disappear when alternative definitions are used. It is misleading to compare the detection or resolution capabilities of different field systems or configurations solely on the basis of the apparent resistivity curve. For the in‐loop transient electromagnetic (TEM) method, apparent resistivity computed from the magnetic field response displays much better behavior than that computed from the induced voltage response. A comparison of “exact” and “asymptotic” formulas for the TEM method reveals that automated schemes for distinguishing early‐time and late‐time branches are at best tenuous, and those schemes are doomed to failure for a certain class of resistivity structures (e.g., the loop size is large compared to the layer thickness). For the magnetotelluric (MT) method, apparent resistivity curves defined from the real part of the impedance exhibit much better behavior than curves based on the conventional definition that uses the magnitude of the impedance. Results of using this new definition have characteristics similar to apparent resistivity obtained from time‐domain processing.

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