Seismic Instruments最新文献

{"title":"A Reply to R.A. Dyagilev’s Comment on “New Opportunities for Epicentral Seismic Observations” by N.K. Kapustian, E.V. Shakhova, and G.N. Antonovskaya","authors":"N. K. Kapustian, E. V. Shakhova, G. N. Antonovskaya","doi":"10.3103/S074792392206007X","DOIUrl":"10.3103/S074792392206007X","url":null,"abstract":"","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"744 - 744"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4421616","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":"Preliminary Estimates of the Characteristics of Radiation and Propagation of Seismic Waves and the Ground Motion Prediction Equations for the Ural Region","authors":"V. A. Pavlenko","doi":"10.3103/S0747923922060123","DOIUrl":"10.3103/S0747923922060123","url":null,"abstract":"<p>This paper reports the first estimates of the characteristics of radiation and propagation of seismic waves in the Ural region obtained by modeling the accelerograms of recorded local earthquakes. The obtained source parameters are similar to those of the Caucasian region, while the seismic wave propagation characteristics are similar to those of the Baikal rift zone. A somewhat increased duration of strong motion in the Ural region can obviously be explained by a fractured structure of the Ural Mountains. The ground motion prediction equations (GMPEs) proposed by the Global Earthquake Model (GEM) project for the Ural region correspond to the platform regions with a stable continental seismicity, while the obtained characteristics of radiation and propagation of seismic waves in the Ural region correspond to the seismically active regions with a crustal seismicity. The comparison of the amplitudes of acceleration response spectra of the strongest earthquake recorded in the region with the estimates obtained by using the GMPEs has revealed a considerable excess of the estimates over the observed spectral amplitudes. Hence, the recommendations of the GEM should not be used in their original form, without correction factors, and it is necessary to develop the regional GMPEs for the purposes of seismic hazard analysis.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"626 - 634"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4419038","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":"A Comment on “New Opportunities for Epicentral Seismic Observations” by N.K. Kapustian, E.V. Shakhova, and G.N. Antonovskaya","authors":"R. A. Dyagilev","doi":"10.3103/S0747923922060032","DOIUrl":"10.3103/S0747923922060032","url":null,"abstract":"","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"743 - 743"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4419642","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":"Strong Earthquakes in the Northern Baikal Region in 2016–2017 (МW = 5.0 and МW = 4.8)","authors":"V. I. Melnikova,&nbsp;N. A. Gileva,&nbsp;A. I. Filippova,&nbsp;Ya. B. Radziminovich","doi":"10.3103/S074792392206010X","DOIUrl":"10.3103/S074792392206010X","url":null,"abstract":"<p>This paper presents the results of a detailed study of two relatively strong seismic events, occurred on November, 22, 2016 (<i>М</i>_<i>W</i> = 5.0) and April 3, 2017 (<i>М</i>_<i>W</i> = 4.8) at the northeastern flank of the Baikal rift zone in the areas of the South Muya and Kalar ranges. Both the events were followed by weak aftershocks (<i>N</i> = 178–539, <i>К</i>_р ≤ 11.0), whose epicenters were densely distributed over an area. The seismic moment tensors and hypocentral depths of the mainshocks were calculated from surface wave amplitude spectra. It has been shown that their sources were formed under the influence of the subhorizontal SE–NW extension and the subhorizontal or inclined NE–SW compression. Both the earthquakes were followed by noticeable macroseismic effects at epicentral distances up to 500 km. In the area of the Baikal−Amur Railway, their shaking intensity was IV–V MSK-64. The results obtained can be used in continuous seismic monitoring at the northeastern flank of the Baikal rift zone and can contribute to an objective seismic hazard assessment of the study area.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"611 - 625"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4419625","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":"New Opportunities for Epicentral Seismic Observations","authors":"N. K. Kapustian,&nbsp;E. V. Shakhova,&nbsp;G. N. Antonovskaya","doi":"10.3103/S0747923922060068","DOIUrl":"10.3103/S0747923922060068","url":null,"abstract":"<p>This study considers the hardware and methodological possibilities for increasing the information content of seismological observations in the epicentral zone of a platform earthquake without obvious surface manifestations. It is shown that the microseismic background analysis conducted during the installation of several seismic stations is efficient for both identifying the source location and refining the geodynamic features of the environment in the epicentral zone. The results of the coherent-time analysis of recordings at the three-component registration made to identify endogenous microcracks hidden by microseismic noise are presented. Their power, number, and azimuths are calculated. The possibility of using an autostructural function for the time series of a stream of micropulses at long-term recording of microseisms is shown to identify the self-organization of crustal blocks by similarities in their geodynamics. The requirements for the seismic equipment necessary for the observations are discussed.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"732 - 742"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4419627","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":"Seismic Activations in Italy, Greece, and Turkey during the 17th–19th Centuries","authors":"L. I. Ioganson","doi":"10.3103/S0747923922060056","DOIUrl":"10.3103/S0747923922060056","url":null,"abstract":"<p>The data on seismic activations (SAs) in Italy, Greece, and Turkey for the 17th–19th centuries are analyzed to clarify the common patterns of SA occurrence in the different seismically active regions associated with similar geodynamic conditions. The time clustering of strong earthquakes (<i>М</i> ≥ 5.6, <i>I</i> ≥ IX) in Italy, Greece, and Turkey in the 17th–19th centuries has made it possible to identify a number of SAs of various durations both in each country and in the whole region. However, the revealed recurrences are extremely uneven in the time range, the number of earthquakes, and the intervals between the individual SAs. Italy is recorded to have had 12 SAs; the 17th and 18th centuries are characterized by the maximum seismic activity, declining gradually by the 19th century. Nine and eight SAs were detected in Greece and Turkey, respectively, with seismic activity increasing strongly in these countries in the 19th century. The periods of common seismic activation for the entire region are also defined: 1658–1680, 1694–1743, 1766–1791, and 1846–1867.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"694 - 709"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4419626","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":"Bottom Sediment Investigations of Lake Onega Using Underwater Seismic and Electromagnetic Surveys","authors":"A. K. Mirinets,&nbsp;A. A. Bobachev,&nbsp;A. E. Rybalko","doi":"10.3103/S0747923922060111","DOIUrl":"10.3103/S0747923922060111","url":null,"abstract":"<p>We present the results of very high-resolution seismic profiling (VHR) and underwater electrical resistivity tomography (ERT) measurements in the Petrozavodsk Bay of Lake Onega, which were carried out to research the structure of Quaternary sediments. According to the VHR, five seismic sequences were identified during the seismic stratigraphy analysis, and a three-layer geoelectric section was obtained using ERT. The next step was an accomplishment of 2D ERT inversion based on reflectors from the VHR data. The joint interpretation of geophysical data was completed on the basis of comparative and cluster analyses with reference to the well and known geological data. During the research new information was obtained about the physical properties of the bottom sediments. The results indicate the need to apply such an approach to the interpretation of geophysical data and the prospects for the joint application of VHR and ERT acquisitions.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"710 - 719"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4421617","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":"Identification of Linear Formations in the Structure of Seismicity by Calculating the Scalar Products of Pairs of Seismic Events That Are Closest in Time","authors":"A. A. Lukk","doi":"10.3103/S0747923922060093","DOIUrl":"10.3103/S0747923922060093","url":null,"abstract":"<p>A method is proposed for calculating scalar products of pairs of seismic events that are closest in time to isolate sequences of epicenters of crustal earthquakes (chains) connected in space and time. To verify the developed methodology, the model and real catalogs of earthquakes of the Garm region in Tajikistan are compared. The efficiency of the proposed algorithm is shown. Based on the totality of the results of the allocation of chains, the issues that complicate the detection of the mentioned structures in the general case are considered. In the process of applying the created program to the real catalog of earthquakes of the Garm region, the existence of four pairwise orthogonal prevailing directions in their orientation was established. There were also some changes in the time of the predominant role of the selected strike of chains of earthquake epicenters. It is possible that these changes may reflect some elements of the dynamics of the seismic process in the Garm region.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"720 - 731"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4421622","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":"A Study of Seismic Impacts on the Construction Site of the SRF SKIF","authors":"A. A. Emanov,&nbsp;A. F. Emanov,&nbsp;E. B. Levichev,&nbsp;V. M. Solovyev,&nbsp;I. N. Churkin,&nbsp;D. G. Korabelshchikov,&nbsp;S. V. Sinyatkin,&nbsp;V. V. Yankaitis,&nbsp;P. A. Piminov,&nbsp;A. A. Bakh,&nbsp;G. N. Baranov,&nbsp;A. V. Fateev,&nbsp;K. Yu. Karyukina,&nbsp;P. O. Polyansky,&nbsp;A. V. Durachenko,&nbsp;N. A. Serezhnikov,&nbsp;E. A. Gladyshev,&nbsp;V. V. Arapov,&nbsp;E. V. Shevkunova,&nbsp;I. A. Antonov,&nbsp;R. A. Ershov","doi":"10.3103/S0747923922060044","DOIUrl":"10.3103/S0747923922060044","url":null,"abstract":"<p>The results of an experimental study of seismic vibrations at the site for the construction of the Siberian Ring Photon Source (SKIF), which is a synchrotron radiation source of the fourth plus generation at 3 GeV and a perimeter of 480 m, have been considered. Seismic vibrations are a hindrance that reduces the accuracy of the experimental setup when studying materials with precision accuracy and resolution. The experiment was performed with broadband seismological equipment used at seismological stations. Seismic vibrations from different types of sources have been investigated: natural and man-made earthquakes, industrial explosions, noises of automobile and railway transport, vibrations from industrial equipment at enterprises located away from the facility under construction. Natural earthquakes create the strongest broadband impact on the site. Man-made earthquakes in the area of the Gorlovka coal basin can create short-term strong seismic impacts. Industrial explosions in terms of the seismic impact on the site are significantly inferior to the effects of earthquakes and are characterized by a more limited spectral composition of vibrations. The noises of motor transport cover frequencies from 4 to 30 Hz and quickly fade away along the site with distance from the road. Railway noises have the characteristic appearance of a set of multiple harmonics covering a wide frequency range with a duration of up to 10 min. Monochromatic signals from the operation of industrial equipment on and off the site are recorded at the site. At the same time, both continuous signals and those that occur episodically are recorded. A special class consists of monochromatic oscillations with a slowly varying frequency. The information on the level, spectrum, and duration of seismic vibrations necessary for calculating the seismic protection of the SKIF Central Research Center during its creation and development of a seismological monitoring system that compensates for the seismic effect on the accuracy of experiments was obtained.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 6","pages":"635 - 662"},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4421052","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":"Assessment of the Effect of Temperature Difference on Gravimetric Measurements When Changing the Observation Point","authors":"M. N. Drobyshev,&nbsp;D. V. Abramov,&nbsp;V. N. Koneshov,&nbsp;D. A. Malysheva","doi":"10.3103/S0747923922050061","DOIUrl":"10.3103/S0747923922050061","url":null,"abstract":"<p>Transient processes in gravimetric data spanning more than 12 years are considered. During this time, more than 15 trips were made from the fundamental gravimetric point Ledovo to the first class point Zapolskoe and back using two CG 5 Autograv automated relative gravimeters. The most significant parameters that affect the readings of the instruments were identified: ambient temperature, the values of the zero drift of the sensing element of the gravimeter, and the direct increment of gravity. The zero drift was taken into account using a second-order polynomial prediction, and the remaining two parameters were described by a logarithmic dependence. The natural logarithm equation allows describing the functions by measuring the coefficient before the logarithm (logarithmic) and additional (linear). The value of the logarithmic coefficients characterizing the duration of transient processes has a linear dependence on temperature, which means that it can characterize the measurement time at the point in the case of a significant temperature change. The magnitude of the linear coefficients characterizing the increase in gravity depends linearly on temperature when the instruments are moved to a colder environment. When the instruments are moved to a warmer environment (10°), the dependence becomes more complex, possibly random, which also requires an increase in the measurement time at the point. The usual duration of measurements at gravimetric stations is 10 min. The relevance of taking temperature into account at measurement points depends on the required accuracy, for example, for a temperature difference of 10°C, the RMS of gravimetric measurements was ±0.025 mGal.</p>","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":"58 5","pages":"534 - 539"},"PeriodicalIF":0.9,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5172277","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}