Seismic Instruments最新文献

{"title":"Orenburg Regional Network “Neftegaz-Seismika”","authors":"M. Y. Nesterenko,&nbsp;I. M. Aleshin,&nbsp;A. G. Goev,&nbsp;O. A. Kapustina,&nbsp;A. I. Astaskevich","doi":"10.3103/S0747923924700014","DOIUrl":"10.3103/S0747923924700014","url":null,"abstract":"<p>The article briefly describes Orenburg oblastal seismic network. It includes the location of seismic stations and technical equipment, etc. The basic characteristics of the network, such as its sensitivity, the completeness of the earthquake catalog, etc., are considered. The location and properties of the main seismic boundaries in the region have been estimated using data from a single broadband station: sediment–basement, the Moho, and mantle transition zone. Records of remote earthquakes and the receiver function method were used to determine the boundaries.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"59 1-3","pages":"1 - 9"},"PeriodicalIF":0.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical and Horizontal Displacements Based on Observations at Talaya Station (Southwest Part of the Baikal Rift)","authors":"V. Yu. Timofeev,&nbsp;A. V. Timofeev,&nbsp;D. G. Ardyukov,&nbsp;I. S. Sizikov,&nbsp;D. A. Nosov","doi":"10.3103/S0747923924700026","DOIUrl":"10.3103/S0747923924700026","url":null,"abstract":"<p>Rates of modern movements are an important factor in the modern geodynamics of the Baikal Rift System. Reflection of strong earthquakes in the experimental values of displacements is discussed, as well as the question of modern vertical movements. According to absolute gravimetry and space geodesy measurements of vertical and horizontal movement rates at the Talaya seismic station (Baikal Rift) for 1992–2022, the displacement rates were determined as 1.7–1.9 mm/year SEE with respect to the point of Irkutsk (Siberian Platform). A set of methods was used to obtain the vertical movement rates for different epochs prior to, during, and after the Kultuk earthquake (2008, M = 6.3, 25 km to epicenter). Subsidence rates vary from 1.1 to 3.3 mm/yr. Possible signs of preparation of Baikal earthquakes have been identified</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"59 1-3","pages":"35 - 47"},"PeriodicalIF":0.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of Self-Noise of Magnetic Sensors Based on Parallel Test Data","authors":"A. D. Konoplin","doi":"10.3103/S0747923924700051","DOIUrl":"10.3103/S0747923924700051","url":null,"abstract":"<p>The article presents experimental results of parallel testing of component magnetic sensors of various types—coil, torque optical-mechanical, and magnetomodulation. Experimental estimations of the level of self-noise of tested sensors are produced and compared with early known data. It has been experimentally determined that the most reliable and stable estimation of self-noise may be obtained in the group of sensors of the same type or by deliberately using a less noisy sensor as a reference. It is shown that experimental estimation of self-noise for coil sensor may significant differently from a theoretical one in the range of low frequencies. It is shown that a coil sensor has the best noise performance, whereas a sensor based on magnetomodulation transducer is the noisiest.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"59 1-3","pages":"48 - 53"},"PeriodicalIF":0.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143553958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismogram Fingerprints As a Tool for Automatic Filtering of Low-Frequency Noise","authors":"K. Yu. Silkin","doi":"10.3103/S074792392470004X","DOIUrl":"10.3103/S074792392470004X","url":null,"abstract":"<p>The article begins with a review of publications on low-frequency noise suppression techniques. Denoising seismograms of earthquakes, explosions, and other seismic events is the goal of the study. It demonstrates that a branch in the theory and practice of seismogram processing is currently being actively developed, in which they are analyzed in a two-dimensional time–frequency plane. Additional second- and third-level add-ons appear in addition to the existing methods, which makes it difficult both to understand the essence of the methods and interpret their results. In our article, we attempted to order things in them. As an alternative to numerous add-ons to time–frequency analysis, we proposed our own approach. We believe that it will not only make the analysis clearer, but also increase its accuracy. Our method is based on the application of fingerprint technology to the results of continuous wavelet transform of a seismogram. In difficult cases, we recommend using a more advanced version of it: the redundant fingerprint method. It provides a convenient opportunity to objectively assess the frequency responses of all components of the seismogram. Based on the results of analysis, the automatic information system can select the optimal cutoff frequency for the filter in order to clear the seismogram of low-frequency noise and minimally distort the signal shape. This is especially important if the spectra of both partially overlap and if the noise intensity is high. The method may find itself in demand for automatic classification of seismic events by the nature of their source using machine learning technologies.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"59 1-3","pages":"21 - 34"},"PeriodicalIF":0.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development and Application of a Portable Vibroseis Source for Acquisition and Analysis of Seismic Surface Wave Data","authors":"A. V. Yablokov,&nbsp;P. A. Dergach,&nbsp;A. S. Serdyukov,&nbsp;S. S. Polozov","doi":"10.3103/S074792392208014X","DOIUrl":"10.3103/S074792392208014X","url":null,"abstract":"<p>The paper is devoted to development of a portable vibrating unit and study of its applicability in generating seismic waves. The solution to developing a portable vibrating unit problem capable of generating a stable seismic signal in the target frequency range is very important. Existing solutions are cumbersome and cannot be widely applied in engineering seismic exploration. The paper describes in detail the design of the vibrator source, the stages of output laptop signals testing, the power amplifier, and haptic transducer control. Signals with different frequency sweeps were used during field acquisition. The recorded data were processed by multichannel analysis of surface waves. As a result of comparing the amplitude spectra and dispersion images of the surface wave, it was found that a hyperbolic (low-dwell) sweep signal generates a surface wave train in the entire frequency range (10–150 Hz), but does not produce high-frequency interference waves in cement concrete pavement as opposed to other sweep signals and sledgehammers. Based on the field data processing results, we reconstructed a one-dimensional shear-wave velocity model for soils and concluded on the success, practicability, and increased (compared to a sledgehammer) efficiency of using the developed vibrator source for acquisition and analysis of surface wave data for engineering seismology problems. The undoubted advantages of using a vibration source are controllability of the frequency content and its repeatability. The use of such vibroseis devices combined with stationary seismic recording systems is a promising direction for solving seismic monitoring problems.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S195 - S203"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4831926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Recent Deformation Processes in the Gas and Oil Field of Central Asia","authors":"G. O. Abramyan,&nbsp;D. K. Kuzmin,&nbsp;M. D. Lomonosov","doi":"10.3103/S0747923922080023","DOIUrl":"10.3103/S0747923922080023","url":null,"abstract":"<p>The paper analyzes the results of ground-based and satellite repeat geodetic observations at a gas and oil field. The set of available geological, geophysical, and geodetic data has made it possible to conduct a comparative analysis with theoretical vertical and horizontal displacements at the field. Analytical calculations were done with the deformable reservoir model. The results of the comparative analysis and conclusions indicate both regular correspondence and inconsistent results between theory and observations.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S337 - S344"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5130075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Topography on Thermoelastic Deformations of the Earth’s Core: Temperature Field Corrections","authors":"I. Ya. Tsurkis","doi":"10.3103/S0747923922080138","DOIUrl":"10.3103/S0747923922080138","url":null,"abstract":"<p>The article presents a preparatory stage for solving the thermoelasticity problem for a halfspace with relief. The effect of the relief on diurnal and season variations of the temperature in the upper layer of the crust induced by temperature variations the in atmosphere is studied. The case of weak two-dimensional relief is discussed. In this paper, we say that relief is weak if: (1) the angle of inclination of a relief element to the horizon is small; (2) the thickness <i>d</i> of the heated layer is small compared to the radius of curvature of the line of the relief. For the diurnal mode, we have <i>d</i> ≈ 15 cm, for the seasonal mode, <i>d</i> ≈ 3 m<i>.</i> The heat equation with a boundary condition of the first kind is considered, and an approximate analytical solution is obtained. The results are compared with the numerical solution, which can be considered. The approximate formula gives a satisfactory result if: (1) the angle of inclination of a relief element to the horizon does not exceed 0.2 rad; (2) the curvature of the line of relief does not exceed 2.4 × 10^–2 m^–1 for the diurnal mode and 1.2 × 10^–3 m^–1 for the seasonal mode. In this case the relative discrepancy between the numerical and approximate analytical solutions is less then 4% if the depth ≤20<i>d</i>. Temperature variations at a depth of 20<i>d</i> are already almost completely absent: the amplitude does not exceed ~10^–9–10^–8°C<i>.</i> Therefore, the underlying layers do not significantly effect on displacements and tilts of relief elements located near the surface.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S234 - S246"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4829868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of the GNSS Monitoring Network of the Nizhne-Kansky Massif Using a Bedrock Pin Geodetic Center","authors":"A. I. Manevich,&nbsp;R. V. Shevchuk,&nbsp;V. I. Kaftan,&nbsp;V. N. Tatarinov,&nbsp;S. M. Zabrodin","doi":"10.3103/S0747923922080084","DOIUrl":"10.3103/S0747923922080084","url":null,"abstract":"<p>The paper presents the results from upgrading the satellite geodetic network of the geodynamic test area of the Nizhne-Kansky massif using bedrock pin geodetic centers in 2021–2022. A brief review is given of the historical experience of using bedrock pin centers in developing satellite geodetic networks at geodynamic test sites, in particular, in areas where underground research laboratories are located. Based on this experience, the design and technology of installing rock geodetic centers were developed and implemented. The design of bedrock pin centers makes it possible to minimize the centering error and ensure immobility of GNSS equipment throughout the entire measurement session. The results of expanding the geodetic network in connection with the start of construction of an underground research laboratory in Krasnoyarsk krai are presented. The form of finite elements of the modernized geodetic network is analyzed. It is shown that construction of new GNSS stations had a positive effect on the network geometry. As a result, the network has increased the number of close-to-equilateral triangles (finite elements), which will have a positive effect on the accuracy in calculating the deformations of the Earth’s surface when processing geodetic measurement results and when forecasting the long-term stability of the geological medium in the study area.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S267 - S280"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4830810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimating the Error in Solving the Inverse VES Problem for Precision Investigations of Time Variations in a Geoelectric Section with a Strong Seasonal Effect","authors":"A. A. Bobachev,&nbsp;A. V. Deshcherevskii,&nbsp;A. Ya. Sidorin","doi":"10.3103/S0747923922080059","DOIUrl":"10.3103/S0747923922080059","url":null,"abstract":"<p>As part of studies on the search for earthquake precursors, the authors have conducted an experiment on long-term precision monitoring of variations in the resistivity of the Earth’s crust in a highly seismic region of Tajikistan. The primary data of this experiment can be considered a special type of VES profile, in which, instead of a linear coordinate, the sounding date changes from picket to picket. When processing precision monitoring data, it is necessary to solve the inverse VES problem with the highest possible accuracy. VES curve inversion programs commonly used in electric exploration do not allow this. The authors have previously developed a special method for regularizing the residual functional, which suppresses the effect of resistivity buildup, due to which the error in reconstructing the resistivity of rocks for profiles with a strong seasonal variation in resistivity is reduced by an order of magnitude. However, in some cases, the regularized algorithm strongly biases estimation of the amplitude of the seasonal resistivity variation in the lower layers of the section. In this paper, the operation of the proposed algorithm is tested in detail for nine model profiles simulating a real geoelectric section. The considered profiles differed in the characteristics of the seasonal variability of resistivity in the lower layers of the section (the phase and amplitude of seasonal effects varied). It is shown that resistivity buildup is effectively suppressed in all cases. For each model profile, the error in solving the inverse problem is estimated. The effect of a biased estimate of the amplitude of seasonal variation is studied. It is shown that in most cases, analysis of the solution makes it possible to reveal the presence of such distortions and qualitatively assess their character. It is also shown that for profile options supposedly closest to the experimental profile, the estimates have minimal bias. For all profiles, the ratio of the average and maximum errors in calculating the resistivity in different layers to the residual in the solution to the inverse problem was evaluated. This makes it possible to evaluate the actual error of the reconstructed resistivity values knowing only the fitting residual. The paper also studied the possible effect of increasing the accuracy in solving the inverse problem in the case of preliminary decomposition of the apparent resistivity curves into seasonal and flicker noise components. It is shown that for small fitting residuals, the results change insignificantly. According to the results obtained, the error in reconstructing the aperiodic (flicker noise) component of resistivity variations in the lower layers of the considered section can be decreased to 0.4%. The accuracy in reconstructing the seasonal component of resistivity variations depends on the amplitude and phase of seasonal effects in the model profile. For the considered profiles, the error varies from 1 to 2%.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S219 - S233"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4829490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neotectonic Stress State of the Chuya–Kurai Depression and Adjacent Structures (Southeastern Altai Mountains)","authors":"A. V. Marinin,&nbsp;L. A. Sim,&nbsp;E. A. Manuilova,&nbsp;I. V. Bondar,&nbsp;N. A. Gordeev","doi":"10.3103/S0747923922080096","DOIUrl":"10.3103/S0747923922080096","url":null,"abstract":"<p>A set of tectonophysical methods has been applied to reconstruct the neotectonic stresses of the southeastern Altai Mountains within the Chuya–Kurai depression and its framing structures. It is suggested that at the neotectonic stage, the tectonic structures of the Altai Mountains underwent a transformation of geodynamic conditions—a situation of sublatitudinal horizontal compression with predominant reverse-fault and transpressional movements along faults that existed up to the Neogene was replaced by horizontal shear conditions with a NNE and NE subhorizontal compression axis and WNW and NW extension axis. With such a stress field, the dominant NW-trending faults in this territory are mainly characterized by dextral strike-slip displacements, and NE-trending faults, by sinistral. Submeridionally trending faults that formed at the neotectonic stage show clear signs of extensional structures. A feature of the faults of the Chuya–Kurai depression according to these studies is a fairly small number of megafractures (indicators of shear displacements) in shear zones. This indicates dominant reverse-fault and transpressional movements over large disjunctive structures in the region in the Paleozoic and Mesozoic versus neotectonic shear movements. The results of the research are of practical importance in studying the regional seismicity.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 2","pages":"S345 - S355"},"PeriodicalIF":0.9,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4829491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}