Seismic Instruments最新文献_第6页

On the Size of an Aftershock Zone of a Large Earthquake 关于大地震余震区的大小

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Seismic Instruments Pub Date : 2022-09-30 DOI: 10.3103/S0747923922050073

E. Y. Khachiyan

{"title":"On the Size of an Aftershock Zone of a Large Earthquake","authors":"E. Y. Khachiyan","doi":"10.3103/S0747923922050073","DOIUrl":"10.3103/S0747923922050073","url":null,"abstract":"Aftershocks following a large earthquake are an inevitable part of the preparation and occurrence of large earthquakes. Depending on the location of the epicenter, tectonic–structural conditions of the epicentral zone, and earthquake intensity on the Earth’s surface, an aftershock cluster can cover different surface areas. Establishing the quantitative relationships between the aftershock zone and the main parameters of the earthquake (magnitude, rupture length, and slip value) can contribute to improving the model of an earthquake as a natural physical phenomenon. The extents of aftershock and deformation zones, as well as macroseismic changes on the Earth’s surface, indirectly indicate the intensity of the mainshock and the presence of portions with different degrees of weakening of rocks in the epicentral zone. This paper proposes a method to determine the area of such an aftershock zone using a deformational model of earthquake preparation and nucleation proposed earlier by the author. A new expression is obtained for determining the area of an aftershock zone depending on (i) the length of the rupture formed during the earthquake and (ii) the average slip along the rupture; expressions for the logarithmic and linear dependences of this area on the earthquake magnitude are also obtained. It is shown that the areas of the aftershock and deformation zones around an earthquake source are identical.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5172266","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}

引用次数: 0

Regularization of the Solution of the Inverse VES Problem by the Contrast Stabilization Method: Testing the Algorithm on Model Data 用对比稳定化方法正则化VES逆问题的解:在模型数据上的算法检验

IF 0.9

Seismic Instruments Pub Date : 2022-09-30 DOI: 10.3103/S074792392205005X

A. A. Bobachev, A. V. Deshcherevskii, A. Ya. Sidorin

引用次数: 3

Analysis of Sequences of Aftershocks Initiated by Underground Nuclear Tests Conducted in North Korea on September 9, 2016 and September 3, 2017 2016年9月9日和2017年9月3日朝鲜地下核试验引发余震序列分析

IF 0.9

Seismic Instruments Pub Date : 2022-09-30 DOI: 10.3103/S0747923922050097

I. O. Kitov, I. A. Sanina

{"title":"Analysis of Sequences of Aftershocks Initiated by Underground Nuclear Tests Conducted in North Korea on September 9, 2016 and September 3, 2017","authors":"I. O. Kitov, I. A. Sanina","doi":"10.3103/S0747923922050097","DOIUrl":"10.3103/S0747923922050097","url":null,"abstract":"The article presents the results of analyzing aftershock sequences initiated by underground nuclear tests conducted in North Korea in 2016 and 2017. Waveform cross-correlation and a multimaster method applied to phase association allowed us to find and analyze 91 aftershocks and group them into clusters associated with the underground explosions on September 9, 2016 (DPRK-5) and September 3, 2017 (DPRK-6). The duration, intensity, and sporadic nature of these two sequences indicate specific mechanisms of seismic energy release, which are probably related to the interaction of the destruction zones of DPRK-5 and DPRK-6 explosions and the collapse of their cavities with the gradual advance of the collapse columns to the free surface. The aftershock activity in 2021 suggested that the collapse process was not yet completed and predicted the occurrence of new aftershocks in the near future, which could end in the collapse column reaching the free surface. These assumptions were confirmed; during the preparation of this work, a strong aftershock with a magnitude of 3.85 was recorded on February 11, 2022, which, according to preliminary estimates, indicates the beginning of the final stage of the advance of the collapse column to the surface, the probability of which is discussed in this study.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5173825","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}

引用次数: 0

Sensor for the Concentration of Small Atmospheric Ions for Field Geophysical Observations 用于野外地球物理观测的大气小离子浓度传感器

IF 0.9

Seismic Instruments Pub Date : 2022-09-30 DOI: 10.3103/S0747923922050024

S. V. Anisimov, K. V. Aphinogenov, S. V. Galichenko, A. A. Prokhorchuk

{"title":"Sensor for the Concentration of Small Atmospheric Ions for Field Geophysical Observations","authors":"S. V. Anisimov, K. V. Aphinogenov, S. V. Galichenko, A. A. Prokhorchuk","doi":"10.3103/S0747923922050024","DOIUrl":"10.3103/S0747923922050024","url":null,"abstract":"The paper presents the results of the analytical and hardware development of a bipolar sensor for the concentration of small atmospheric ions, designed for long-term geophysical field observations. Theoretical estimates of the response function of the sensor are obtained. The dependence of the concentration of small atmospheric ions on the magnitude of the measured current of the aspiration capacitor and ion mobility spectrum is given. Numerical computations of the trajectories of small ions in an aspiration condenser of specified dimensions and geometry are performed. The probability of recording ions depending on their mobility is found. The circuit solutions and algorithms for the functioning of the hardware of the devices are described. Based on the development materials, prototypes of sensors are made. The technical characteristics and recommendations for the use of devices are given. Unlike analogues, the device is resistant to environmental influences. The sensors are tested in laboratory conditions and during the field observations of the electricity of the atmospheric boundary layer. In addition to being used as a part of a ground-based complex for geophysical observations, the developed sensor was used in an instrumental platform for balloon observations aloft. As a result of testing the devices, it was found that the functioning of the sensors is stable and the data are representative.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4042450","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}

引用次数: 1

Natural Oscillations of a Tower-Type High-Rise Building: Modes of Horizontal, Vertical and Rotational Oscillations According to the Standing Wave Method and Verification of the Computational Model 塔式高层建筑的自然振动:基于驻波法的水平、垂直和旋转振动模式及计算模型的验证

IF 0.9

Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040028

A. F. Emanov, A. M. Belostotsky, A. A. Bakh, E. A. Khoroshavin, D. S. Dmitriev, A. I. Nagibovich, A. A. Emanov, V. V. Yankaitis, N. A. Serezhnikov, A. G. Sheboltasov

{"title":"Natural Oscillations of a Tower-Type High-Rise Building: Modes of Horizontal, Vertical and Rotational Oscillations According to the Standing Wave Method and Verification of the Computational Model","authors":"A. F. Emanov, A. M. Belostotsky, A. A. Bakh, E. A. Khoroshavin, D. S. Dmitriev, A. I. Nagibovich, A. A. Emanov, V. V. Yankaitis, N. A. Serezhnikov, A. G. Sheboltasov","doi":"10.3103/S0747923922040028","DOIUrl":"10.3103/S0747923922040028","url":null,"abstract":"For a unique building in the form of a tower with a core of rigidity in the center, experimental studies of natural oscillations by the standing wave method with theoretical calculations based on a finite element model are performed and compared. From the experiment, ten translational horizontal modes of natural oscillations, five torsional modes of natural oscillations, and eight vertical modes of natural oscillations were identified and investigated. The finite element model is used to calculate the natural oscillations corresponding to all experimentally isolated oscillation modes. The experiment and theory are compared over the entire set of natural frequencies. Differences in natural frequencies reached 20%. After the studies, if possible, correction of the computational model ensured the difference between the experiment and the theory in terms of the values of natural frequencies of no more than 7.5%. Verification of design models of buildings using the standing wave method is an effective approach to assessing the physical condition of buildings and their seismic resistance.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4110785","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}

引用次数: 0

Unification of Magnitudes for Modern Earthquakes in the Eurasian Arctic Region 欧亚北极地区现代地震震级的统一

IF 0.9

Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040077

A. N. Morozov, N. V. Vaganova, Ya. A. Mikhailova, I. V. Starkov

{"title":"Unification of Magnitudes for Modern Earthquakes in the Eurasian Arctic Region","authors":"A. N. Morozov, N. V. Vaganova, Ya. A. Mikhailova, I. V. Starkov","doi":"10.3103/S0747923922040077","DOIUrl":"10.3103/S0747923922040077","url":null,"abstract":"The article presents the results of identifying correlation relationships between magnitudes of different types, calculated in international and regional seismological centers. An increase in the number of seismic stations in the Arctic in the 21st century and corresponding increase in the number of recorded earthquakes (due to a decrease in the threshold recording magnitude) has made it possible to identify quantitative relationships between magnitudes based on large samplings of earthquakes and in a wide range of magnitudes. From International Seismological Center data for 1995–2020, we obtained 30 ratios between magnitudes of different types, calculated at different seismological centers, in particular, magnitudes ranging from mb and MS 2.6 and ML = 0.8. The identified relationships will make it possible to compile an aggregated unified catalog of earthquakes for certain regions of the Arctic, which is necessary, primarily, for assessing the seismic hazard of certain areas, as well as studying low-magnitude earthquakes and clusters and swarms of such quakes.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4111448","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}

引用次数: 3

Improvements in High-Precision Tiltmeter Instrument Systems Located in an Underground Geophysical Observatory 地下地球物理观测站高精度倾斜仪系统的改进

IF 0.9

Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040041

V. V. Gravirov, A. V. Deshcherevskii, Y. O. Kuzmin, D. V. Likhodeev, A. L. Sobisevich, I. A. Shirokov

引用次数: 2

Detailed Macroseismic Survey and Rational Approach to Seismic Intensity Assessment within the Territory of a Large City: Case Study of the Consequences of the September 21, 2020 Bystraya Earthquake in Irkutsk 大城市区域内详细的宏观地震调查和地震烈度评估的合理方法：2020 年 9 月 21 日伊尔库茨克 Bystraya 地震后果案例研究

IF 0.9

Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040089

Ya. B. Radziminovich, A. V. Novopashina, O. F. Lukhneva, A. V. Kadetova, N. A. Gileva

{"title":"Detailed Macroseismic Survey and Rational Approach to Seismic Intensity Assessment within the Territory of a Large City: Case Study of the Consequences of the September 21, 2020 Bystraya Earthquake in Irkutsk","authors":"Ya. B. Radziminovich, A. V. Novopashina, O. F. Lukhneva, A. V. Kadetova, N. A. Gileva","doi":"10.3103/S0747923922040089","DOIUrl":"10.3103/S0747923922040089","url":null,"abstract":"The article discusses the advisability of conducting detailed macroseismic surveys within large cities and urban agglomerations. A retrospective analysis of information about earthquakes that occurred in the past decades and were felt in Irkutsk with an intensity of I = V or higher revealed the problem of preserving and availability of primary data on earthquake effects. Processing of the macroseismic data collected using internet-based questionnaires for the Irkutsk area after the September 21, 2020 Bystraya earthquake was carried out. The usage of online questionnaires has demonstrated high efficiency and information content, and also opened up certain possibilities such as improving the method with respect to the particular conditions of East Siberia. A large number of responses from earthquake eyewitnesses makes it possible to assess the shaking intensity separately in every administrative unit of Irkutsk, which in turn contributes to an increase in the detail of documenting the earthquake macroseismic field. The results allow us to consider assessment of the shaking intensity within certain parts of Irkutsk city as more rational versus assessment for the entire territory of the city.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4112281","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}

引用次数: 1

Young Landforms Created by Earthquakes in the Foothills of the Kurai Range (Gorny Altai) 古莱山脉(戈尔尼阿尔泰)山麓地震形成的年轻地貌

IF 0.9

Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040065

A. M. Korzhenkov, E. V. Deev, N. I. Pozdnyakova

引用次数: 3

Using Microseisms for Seismic Microzoning 利用微震进行地震微区划

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Seismic Instruments Pub Date : 2022-08-03 DOI: 10.3103/S0747923922040053

A. V. Kalinina, S. M. Ammosov, R. E. Tatevossian, A. M. Turchkov

{"title":"Using Microseisms for Seismic Microzoning","authors":"A. V. Kalinina, S. M. Ammosov, R. E. Tatevossian, A. M. Turchkov","doi":"10.3103/S0747923922040053","DOIUrl":"10.3103/S0747923922040053","url":null,"abstract":"The efficiency of using microseisms for seismic microzoning (SMZ) is discussed based on experimental field data in different geological conditions. The microseism method is in the list of recommendations and codes and is widely used because of its low cost. In SMZ, microseisms are used to estimate the shaking intensity increment by calculating the amplitude spectra at seismic stations and resonance characteristics of ground layers, usually in combination with other methods. Difficulties in taking into account numerous local noise sources may significantly reduce the accuracy of the results. This has to be considered when planning field works for each object (site). In some cases (high anthropogenic noise level), it is better to refrain from using the spectral amplitude ratio in the high frequency band (above 3 Hz). Calculation of intensity increments individually in the 0.5–2 and 2–3 Hz bands, taking as the final increment the maximum of both calculations, guarantees the due level of conservatism; hence, the microseism method is also applicable to critical facilities. The spectral ratio of the horizontal and vertical components of seismic motion (H/V) can be used to estimate the resonance characteristics of soils and structure of the upper part of the soil profile, in particular, the depth of the soil/bedrock boundary.","PeriodicalId":45174,"journal":{"name":"Seismic Instruments","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4112280","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}

引用次数: 1