scholarly journals MIDDLE URAL EARTHQUAKE on October 18, 2015, ML=4.7, I0=6

2021 ◽  
pp. 314-323
Author(s):  
F. Verkholantsev ◽  
I. Gabsatarova ◽  
N. Guseva ◽  
R. Dyagilev
Keyword(s):  
Focal Mechanism ◽  
Seismic Effect ◽  
Middle Urals ◽  
Macroseismic Data ◽  
Macroseismic Field ◽  
Tectonic Position ◽  
The Village

Instrumental and macroseismic data on the earthquake of 18.10.2015 at 21h44m UTC, ML=4.7, I0=6 in the Sverdlovsk region, near the village of Sabik (Middle Urals) are presented. A significant amount of macroseismic data made it possible to build a map of the macroseismic field, taking into account the anisotropic nature of the propagation of the seismic effect. Taking into account the decision of the focal mechanism, the tectonic position of the source was substantiated.

scholarly journals SEISMIC ACTIVITY IN THE VICINITY OF THE VILLAGE OF MAYRAMADAG IN THE REPUBLIC OF NORTH OSSETIA-ALANIA IN 2019

2019 ◽  
Author(s):  
А.А. Саяпина ◽  
И.Ю. Дмитриева ◽  
С.С. Багаева ◽  
К.В. Гричуха ◽  
С.В. Горожанцев
Keyword(s):  
Focal Mechanism ◽  
Seismic Activity ◽  
Seismic Events ◽  
Tectonic Position ◽  
The Republic ◽  
The Village ◽  
North Ossetia

Представлены результаты исследования серии сейсмических событий в феврале 2019 года вблизи южной окраины села Майрамадаг и доказано, что она представляет собой рой генетически подобных землетрясе- ний. Описана его геолого-тектоническая позиция, которая находит отражение в механизмах очагов сильнейших землетрясений роя. This article presents a study of a series of seismic events that occurred in February 2019 in the area of the village of Mairamadag. It is proved that it represents a swarm of genetically similar earthquakes. The geological and tectonic position of the swarm is described, which fi nds refl ection in focal mechanism of its strongest swarm of earthquakes. Keywords: swarm of earthquakes, focal mechanism, Vladikavkaz deep-seated fault.

scholarly journals Determination of parameters of historical earthquakes based on macroseismic data

2020 ◽  
Vol 2 (1) ◽  
pp. 62-75
Author(s):  
Vladlen Cardanets
Keyword(s):  
Field Equation ◽  
Focal Depth ◽  
Historical Earthquakes ◽  
Seismic Effect ◽  
Macroseismic Data ◽  
Earthquake Parameters ◽  
Macroseismic Field ◽  
Carpathian Region ◽  
Wide Range ◽  
Determination Of Parameters

The paper attempts to determine the main parameters of historical earthquakes of the Carpathian region based on macroseismic data, using the macroseismic field equation, indirect parameters, and complex comparison with modern earthquakes. So far, the main source of information about the parameters of historical earthquakes in the Carpathian region has been "New catalog of strong earthquakes ...". In this catalog, all parameters are defined very ap-proximately, with a wide range of values. In addition, over the forty-year period since the release of the catalog, the initial macroseismic data of Carpathian region earthquakes have been substantially replenished and re-evaluated using the MSK-64 macroseismic scale. The study determined such basic parameters of historical earthquakes as the macroseismic epicenter, the intensity at the epicenter, focal depth, and magnitude. As well as additional parameters: direction of the maximum macro-seismic effect, area of intensity zones, distance, and azimuth to the extreme point where the earthquake was felt. The earthquake parameters were calculated using the attenuation formula of the macroseismic field with coefficients obtained by the R.Z. Burtiev for intermediate earthquakes of the Vrancea zone of the Carpathian region, separately in four azimuthal ranges. For crustal earthquakes, the general Blake-Shebalin macroseismic field equation was used. Despite possible errors associated with a correct assessment of intensity at observation points, as well as the accuracy of the coefficients of the macro-seismic field equation used for specific seismic events, it was possible to determine the type of each historical earthquake and obtain more accurate values of their parameters. The re-fined parameters of historical earthquakes will allow making a more holistic picture of the seismic hazard in the Carpathian region.

scholarly journals An analytic method for separating local from regional effects on macroseismic intensity

1995 ◽  
Vol 38 (1) ◽  
Author(s):  
P. Tosi ◽  
V. De Rubeis ◽  
C. Gasparini
Keyword(s):  
Macroseismic Intensity ◽  
Analytic Method ◽  
Macroseismic Data ◽  
Regional Trend ◽  
Regional Effects ◽  
Republic Of Macedonia ◽  
Macroseismic Field ◽  
Qualitative Nature ◽  
Local Intensity ◽  
Yugoslavian Republic

nterpretation of macroseismic data is hazardous, due to its qualitative nature. This, linked with errors in eval- uation,) and the variations of local intensity, makes it difficult to draw valid conclusions. This study presents a statistical method as the basis for distinguishing the diverse components that constitute a macroseismic field. The method is based on the polar transformation of the coordinate system and on the analysis of the fractal di- mension of the intensity values, exposed to the gradually increasing action of a two-dimensional filter. The fractal dimension is shown to be an ideaI parameter with which to measure out the filtering process in order to separate the local components from the regional trend. This method has been applied to two Italian events and to an earthquake which took pIace in the Former Yugoslavian Republic of Macedonia (FYROM).

scholarly journals Inferences on the source mechanisms of the 1930 Irpinia (Southern Italy) earthquake from simulations of the kinematic rupture process

2009 ◽  
Vol 47 (6) ◽  
Author(s):  
A. Emolo ◽  
G. Iannaccone ◽  
A. Zollo ◽  
A. Gorini
Keyword(s):  
Ground Motion ◽  
Southern Italy ◽  
Empirical Relationship ◽  
Normal Fault ◽  
Rupture Process ◽  
Macroseismic Data ◽  
Macroseismic Field ◽  
Good Reproduction ◽  
Source Mechanisms ◽  
Source Models

We examine here a number of parameters that define the source of the earthquake that occurred on 23rd July 1930 in Southern Italy (in the Irpinia region). Starting from the source models proposed in different studies, we have simulated the acceleration field for each hypothesized model, and compared it with the macroseismic data. We then used the hybrid stochastic-deterministic technique proposed by Zollo et al. (1997) for the simulation of the ground motion associated with the rupture of an extended fault. The accelerations simulated for several sites were associated with the intensities using the empirical relationship proposed by Trifunac and Brady (1975), before being compared with the available data from the macroseismic catalogue. A good reproduction of the macroseismic field is provided by a normal fault striking in Apenninic direction (approximately NW-SE) and dipping 55° toward the SW.

scholarly journals TERESVA-II EARTHQUAKE on July 19, 2015 with KR=11.1, МSH=3.4, I0=6 (Transcarpathia, Ukraine)

2021 ◽  
pp. 291-304
Author(s):  
R. Pronishin ◽  
B. Pustovitenko
Keyword(s):  
Intensity Distribution ◽  
Seismic Energy ◽  
Focal Mechanism Solution ◽  
Wide Energy Range ◽  
Macroseismic Data ◽  
Epicentral Zone ◽  
Distribution Parameters ◽  
Wide Energy ◽  
Time And Energy ◽  
The Village

The instrumental and macroseismic data of the Teresvа-II earthquake on July 19, 2015 with the energy class KR=11.1, МSH=3.4 are considered. The earthquake occurred in the seismically active Tyachevo-Sigetskaya zone of Transcarpathia in the upper part of the Earth's crust and caused shaking intensity of I0=6 in the epicentral zone near the village of Teresva. The data on the focal mechanism solution, intensity distribution, parameters of the strongest aftershocks are presented. The release of seismic energy continued for 35 days. During this time, 306 earthquakes were recorded in a wide energy range. The space-time and energy properties of the complex sequence of the Teresvа earthquakes in 2015 have been investigated. The tectonics and previous seismi-city of the area are described.

scholarly journals Earthquake on December 12, 2020 in the Anapa zone with Mw=3.8, I0=4-5

2021 ◽  
Vol 3 (2) ◽  
pp. 52-66
Author(s):  
Anastasia Zvereva ◽  
Andrei Klianchin ◽  
Irina Gabsatarova
Keyword(s):  
Focal Mechanism ◽  
Seismic Survey ◽  
Corner Frequency ◽  
Shelf Zone ◽  
Density Level ◽  
Macroseismic Data ◽  
North Caucasus ◽  
Spectral Parameters ◽  
Seismic Stations ◽  
The North

The article presents instrumental and macroseismic data on the earthquake on 12.12.2020 at 14:54 with Mw=3.8, h=30 km. The epicenter and parameters of the earthquake were deter-mined using instrumental data from the network of regional seismic stations in the western zone of the North Caucasus of the EGS RAS. This earthquake occurred in the shelf zone of the Eastern Black Sea coast near the resort town of Anapa, in the Anapa seismically active area. This area tectonically is the conjunction of the northern side of the Tuapse trough and the thrust front of the Greater Caucasus. The focal mechanism for the earthquake was calcu-lated. The solution of the focal mechanism was obtained from the polarization in P-waves at 29 seismic stations. From the focal follows the type of source up thrust-thrust movement. The GS RAS organized a macroseismic survey in the Anapa and Novorossiysk regions on the “VKontakte” social network a day after the earthquake. According to the results of the study, 144 respondents in 15 settlements in 7 days were interviewing. The maximum observed in-tensity was I=4-5 points in Su-Psekh and Varvarovka according to the results of the macro-seismic survey, a map of the distribution of intensity points was create. The SEISAN software package calculated the spectral parameters of the source: seismic moment, corner frequency, spectral density level and spectral magnitude Mw.

scholarly journals Macroseismic and instrumental studies of the Verkhniy Fiagdon earthquake on January 26, 2020

2020 ◽  
pp. 113-123
Author(s):  
И.Ю. Дмитриева ◽  
А.А. Саяпина ◽  
С.С. Багаева ◽  
С.В. Горожанцев
Keyword(s):  
Seismic Station ◽  
Comfort Level ◽  
Kinematic Characteristic ◽  
Macroseismic Data ◽  
North Caucasus ◽  
Tectonic Earthquake ◽  
P Waves ◽  
The North ◽  
Tectonic Position ◽  
The Republic

Изучение землетрясений территории Северного Кавказа не просто актуальная задача. Ее решение является насущной необходимостью, требует ежедневного, кропотливого труда для повышения уровня комфортности жизни населения. Целью работы является представить достаточно подробный анализ ощутимого тектонического землетрясения, случившегося 26января 2020 года в 21h01m по Гринвичу с интенсивностью сотрясений в эпицентре 4-5 баллов, произошедшего на территории Республики Северная Осетия-Алания. Методы исследования включали: определение параметров гипоцентра сейсмического события с помощью программно-вычислительных комплексах WSG и HYPO71; описание геолого-тектонической позиции очага; расчет и графическое представление механизма очага землетрясения по знакам первых вступлений P-волн; сбор макросейсмических данных путем выездов на места проявления землетрясения для определения интенсивности сотрясений земной поверхности в баллах; рассмотрение историческойи современнойсейсмичности в области исследуемого землетрясения. В результате получено следующее решение параметров гипоцентра землетрясения: φ=42,69°N, φ=44,15°E, h=6 км, Кр=11,2. Очаг землетрясения находился вблизи зоны возникновения очагов землетрясений (ВОЗ) Главного хребтав сейсмотектоническом блоке, расположенном между Главным Кавказским и АдайкомКазбекским разломами. По знакам первых вступлений продольных P-волн на 20 станциях рассчитан механизм очага землетрясения. Согласно полученному решению очаг землетрясения возник в верхней части земной коры под действием сжимающих напряжений, тип движения – взбросо-сдвиг, что согласуется с кинематической характеристикой зоны Главного хребта. Землетрясение, получившее название Верхне-Фиагдонское, характеризуется отсутствием заметного афтершокового процесса, однако анализ имеющихся волновых форм ближайшей сейсмической станции показал наличие последовательности слабых сейсмических событий. Макросейсмический эффект землетрясения был исследован сотрудниками Северо-Осетинского филиала ФИЦ ЕГС РАН в 25 населенных пунктах. Согласно результатам опроса, максимальная интенсивность сотрясений составила 4-5 балла. По результатам оценки интенсивности построена соответствующая карта пунктов-баллов землетрясения. Приведены сведения по истории сейсмичности очаговой зоны исследуемого землетрясения за более чем 150 лет The earthquakes study in the North Caucasus is not just an urgent task. Its solution is an urgent need. It requires daily, painstaking work to increase the comfort level of the population’s life. The aim of the work is to present a sufficiently detailed analysis of the tangible tectonic earthquake on January 26 at 21h01m GMT, which occurred on the territory of the Republic of North Ossetia-Alania. Intensity of the shok equaled 4-5 in the epicenter. Research methods included: determination of the parameters of the seismic event hypocenter using the WSG and HYPO71 software complexes; description of the geological and tectonic position of the source; calculation and graphical presentation of the earthquake source mechanism by the signs of the first arrivals of P-waves; collection of macroseismic data by visits to the places of earthquake manifestation to determine the intensity of shaking the earth’s surface in points; consideration of historical and modern seismicity in the area of the investigated earthquake. As a result, the following solution of parameters of an earthquake is received: φ=42,69°N, φ=44,15°E, h=6 km, KР=11,2. The epicenter of the earthquake occurs near the Main ridge zone. In more detail, the earthquake happened in the seismotectonic block located between the Main Caucasian and Adaykom-Kazbek faults. For the earthquake, the mechanism of the focus was calculated according to the signs of the first arrivals of longitudinal P-waves at 20 stations. According to the solution, the earthquake occurred in the upper part of the earth’s crust under the action of compressive stresses, the type of motion is upthrust-strike-slip, which is consistent with the kinematic characteristic of the Main Ridge Zone. The earthquake, called Verkhniy Fiagdon earthquake, is characterized by the absence of a noticeable aftershock process, but the analysis of the available wave forms of the nearest seismic station showed the presence of a sequence of weak seismic events. The macroseismic effect of the earthquake was investigated in 25 settlements by the staff of the North Ossetian branch of the Geophysical Survey of the Russian Academy of Sciences. According to the survey results, the maximum intensity of concussions was 4-5 points. A map of earthquake manifestations in localities constructed based on the results of the intensity assessment. The history of seismicity of the focal zone of the investigated earthquake for the last 150 years is studied

scholarly journals GONAM EARTHQUAKE on January 4, 2014 with КР=14.2, Mw=5.4, I0=8 (Yakutia, Aldan Highlands)

2020 ◽  
pp. 271-277
Author(s):  
B. Kozmin ◽  
R. Mikhailova
Keyword(s):  
Magnetic Field ◽  
Focal Mechanism ◽  
Geometric Parameters ◽  
Macroseismic Data ◽  
Aftershock Activity ◽  
The Magnetic Field

The results of analysis of instrumental and macroseismic data, focal mechanism, and seismotectonic position of the strong Gonam earthquake occurred on the Aldan Highlands are given. The manifestations of aftershock activity and its connection with the regional Tyrkanda fault are analyzed in more detail. This fault is confidently observed in the positive anomalies of the magnetic field. The geometric parameters (width and length) of the aftershock zone are given.

scholarly journals About Macroseismic Displays of Yandary Earthquake, October 17, 2018

2019 ◽  
Author(s):  
И.Ю. Дмитриева ◽  
А.А. Саяпина ◽  
С.В. Горожанцев ◽  
С.С. Багаева
Keyword(s):  
Geological Structure ◽  
Point Of View ◽  
Reverse Fault ◽  
Macroseismic Data ◽  
Instrumental Data ◽  
History Of ◽  
The Republic ◽  
October 17 ◽  
The Village ◽  
Focal Zone

В рассматриваемой статье проведен анализ и представлены данные о землетрясении 17 октября 2018 г. в 15h55m по Гринвичу с интенсивностью сотрясений в эпицентре 5 баллов, произошедшего на окраине села Яндаре Республики Ингушетия. По инструментальным данным сетей сейсмических станций NOGSR, OBGSR, DAGSR получено следующее решение параметров землетрясения: 43,27N, 44,92E, h12 км, КР11,5. Приведены сведения по истории сейсмичности очаговой зоны исследуемого землетрясения за последние 150 лет. Очаг землетрясения приурочен к активному Сунженскому разлому. Рассмотрены форшоковая активность и немногочисленная серия афтершоков. Для землетрясения был рассчитан механизм очага по знакам первых вступлений продольных Pволн на 48 станциях, хорошо окружавших эпицентр и расположенных на расстояниях 0,3 50,5 км. Согласно полученному решению землетрясение возникло под действием преобладающих сжимающих напряжений. Тип подвижки в очаге соответствовал взбросу с правосторонним сдвигом по плоскости NP2 с юговосточным простиранием и левостороннему сдвигу с компонентами взброса по плоскости NP1 с субширотным простиранием. Для сбора макросейсмических данных сотрудниками СевероОсетинского филиала ФИЦ ЕГС РАН был осуществлен выезд в эпицентральную зону и близлежащие районы. Оценка интенсивности проводилась на основе шкалы ШСИ 17. Землетрясение с интенсивностью 5 баллов проявилось в населенных пунктах Яндаре, Троицкое, Карабулак. Колебания ощущались в Сунже, Барсуках и Плиево силой 4 балла, Назрани 34 балла. В населенных пунктах Магас, АлиЮрт, Средние Ачалуки ощутимость землетрясения составила 3 балла. В семи населенных пунктах колебания проявились интенсивностью в 2 балла. Во Владикавказе землетрясение ощущалось на верхних этажах многоэтажных зданий. Данные о проявлениях Яндарского землетрясения интересны с точки зрения анализа распределения интенсивности сотрясений, изучения сейсмичности региона в целом, а также связи с геологическим строением территории The article analyzes and presents the data on the earthquake on October 17 at 15h55m GMT, which occurred on the outskirts of the village of Yandare of the Republic of Ingushetia. Intensity of the shok equaled 5 in the epicenter. According to instrumental data of networks of seismic stations NOGSR, OBGSR, DAGSR the following solution of parameters of an earthquake is received: 43,27N, 44,92E, h12 km, KР11,5. The history of seismicity of the focal zone of the investigated earthquake for the last 150 years is studied. The earthquake is confined to the active Sunzha fault. The forshock activity and a few series of aftershocks are considered. For the earthquake, the mechanism of the focus was calculated according to the signs of the first arrivals of longitudinal Pwaves at 48 stations well surrounding the epicenter and located at distances 0,3 50,5 km. According to the received decision, the earthquake appeared under the influence of prevailing compression stresses, the type of movement the reverse fault. For collecting macroseismic data departure in an epicentralny zone and nearby areas was carried out. Evaluation of intensity was carried out on the basis of theSeismic intensity scale (SHSI17). The earthquake with an intensity of 5 points was manifested in the settlements of Yandare, Troitskoye, Karabulak. Fluctuations were felt in Sunzha, Barsuki and Plievo force 4 points, Nazran 34 points. In the settlements of Magas, AliYurt, Middle Achaluki, the sensitivity of the earthquake was 3 points. In seven settlements, the fluctuations showed an intensity of 2 points. In Vladikavkaz earthquake was felt on the upper floors of multistorey buildings. Data on the manifestations of the Yandaryearthquake are interesting from the point of view of the analysis of the distribution of the intensity of concussions, the study of the seismicity of the region as a whole, as well as the connection with the geological structure of the territory.

scholarly journals TALDYK EARTHQUAKE on November 17, 2015 with KR=14.1, Mw=5.5 (Kyrgyzstan)

2021 ◽  
pp. 340-348
Author(s):  
A. Frolova ◽  
V. Grebennikova ◽  
N. Bagmanova ◽  
A. Berezina ◽  
E. Pershina ◽  
...  
Keyword(s):  
Focal Mechanism ◽  
Main Shock ◽  
Strike Slip ◽  
Complete Analysis ◽  
Depth Interval ◽  
Macroseismic Data ◽  
The South ◽  
Emergency Situations ◽  
The Third

Information on the earthquake with KR=14.1, which occurred in Kyrgyzstan on November 17, 2015, is presented. Its epicenter is related to the South Fergana zone of the Osh region, in which felt earthquakes with intensity up to I=8–9 occurred repeatedly. This event was named Taldyk according to the settlement nearest to the epicenter. The earthquake was accompanied by numerous aftershocks: for the first day, 189 events were registered, for the second – 196, for the third – 84. Most part of the aftershocks is localized within the depth interval of 12–13 km, which is practically equal to the depth of the main shock (h=13 km). The focal mechanism of the main shock has a reverse type with strike-slip components. No serious investigation of the consequences of this earthquake carried out. Some macroseismic data are received from field reports of the station operators. For a more complete analysis of the possible impact of this earthquake and, first of all, for the needs of the Ministry of Emergency Situations of Kyrgyzstan Republic, a map of theoretical isoseismals was created.

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