scholarly journals GEOLOGICAL-AND-TECTONIC CONDITIONS OF FORMATION AND FOCAL MECHANISM OF TORAIGYR-SOGUETY EARTHQUAKE

2020 ◽  
Vol 6 (444) ◽  
pp. 90-101
Author(s):  
A. R. Zhdanovich ◽  
◽  
◽  
Keyword(s):  
Focal Mechanism ◽  
Seismic Events ◽  
Main Stress ◽  
Catastrophic Earthquake ◽  
Seismic Characteristic

The seismic characteristic of Toraigyr-Soguety earthquake is presented. The significant seismic events of the area are demonstrated including Chilik catastrophic earthquake. Geological-and-tectonic conditions of the epicentric areas of Chilik and Toraigyr-Soguety earthquakes are described. Kinematics of neotectonic faults is considered with respect to directions of main stress axes. Two models of focal mechanism of Toraigyr-Soguety earthquake compare with tectonic deformations of the area.

scholarly journals Evidence of preliminary prognosis of appearance of catastrophic earthquake and strong tsunami in the region of Tarapacá, Chile

2019 ◽  
Author(s):  
Raissa K. Mazova ◽  
Jorge F. Van Den Bosch ◽  
Natalia A. Baranova ◽  
Gustavo A. Oses
Keyword(s):  
Historical Earthquakes ◽  
Seismic Events ◽  
Tsunami Waves ◽  
Work Support ◽  
Chilean Coast ◽  
Catastrophic Earthquake ◽  
Time Period

Abstract. Are analyzed the catastrophic seismic events near Chilean coast and generated by them tsunami 1 April 2014 to north of Iquique with magnitude 8.2. It is noted that event occurred 1 April 2014 was in fact predicted in work (Mazova and Ramirez 1999), in which there were analyzed all strongest Chilean tsunamigenic earthquakes with sources near the Chilean coast. Analysis of catastrophic earthquakes and tsunamis in given region, localization of source of historical earthquakes and character of generated by them tsunami waves permitted authors in that time to make a conclusion about possibility of repeated catastrophic earthquake and tsunami in near 10–20 years. The events near Iquique and Arica city in April 2014 are in this time period. Thus, the evidences, presented in this work, support preliminary prognosis made by authors in 1999.

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.

Cluster analysis in the studying of stress relation in the Vrancea-zone

2021 ◽  
Author(s):  
Lili Czirok ◽  
Lukács Kuslits ◽  
Katalin Gribovszki
Keyword(s):  
Focal Mechanism ◽  
Seismic Events ◽  
Clustering Methods ◽  
Important Indicator ◽  
Focal Mechanism Solutions ◽  
Automated Algorithm ◽  
Vrancea Zone ◽  
Density Based Clustering ◽  
Stress Relation

<p>The SE-Carpathians produce significant geodynamic activity due to the current subduction process. The strong seismicity in the Vrancea-zone is its most important indicator. The focus area of these seismic events is relatively small, around 80*100 km and the distribution of their locations is quiet dense.</p><p>The authors have carried out cluster analyses of the focal mechanism solutions estimated from local and tele-seismic measurements and stress inversions to support the recent and previously published studies in this region. They have applied different pre-existing clustering methods – e.g. HDBSCAN (hierarchical density-based clustering for applications with noise) and agglomerative hierarchical analysis – considering to the geographical coordinates, focal depths and parameters of the focal mechanism solutions of the used seismic events, as well. Moreover, they have attempted to improve a fully-automated algorithm for the classification of the earthquakes for the estimations. This algorithm does not call for the setting of hyper-parameters, thus the affection of the subjectivity can be reduced significantly and the running time can be also decreased. In all cases, the resulted stress tensors are in close agreement with the earlier presented results.</p>

Locating and characterizing seismic events in Los Humeros (Mexico) using time-reverse imaging

2020 ◽  
Author(s):  
Claudia Finger ◽  
Erik H. Saenger
Keyword(s):  
Focal Mechanism ◽  
Time Window ◽  
Moment Tensor ◽  
Geothermal Field ◽  
Seismic Events ◽  
Full Time ◽  
Physical Processes ◽  
Moment Tensors ◽  
Focal Mechanism Solutions ◽  
Source Type

<p>Locating and characterizing the seismicity in a reservoir is crucial for any geothermal project. This study is the first time that the seismicity in a geothermal reservoir is characterized using time-reverse imaging (TRI). The spatio-temporal distribution of events in combination with focal mechanism solutions may enable the mapping of existing fault networks, the estimation of local stress regimes and the distinction between tectonic and induced events. Combining these results with results from other methodologies will in the future lead to an informed understanding of the physical processes occurring in reservoirs.</p><p>TRI is a method for locating and characterizing seismic events. TRI uses the whole time-reversed waveform and a seismic wave propagation solver to locate and characterize events. Therefore, it does not rely on the identification of seismic events and their onsets in the traces. In contrast to common tools that provide hypocenters and focal mechanism solutions for seismic events, TRI does not assume any a priori knowledge about the sources. Since events are not picked in the seismic traces, no assumption is made about the number of sources recorded in a certain time window. Similarly, the characterization of events does not exclude any source type or put any constraints or assumptions on the sources, such as them being only of double-couple nature. Therefore, TRI may be especially well-suited when the overall type of sources is not known or if it is suspected that common localization and characterization tools are not adequately depicting the physical processes in the subsurface.</p><p>In the first part of this study, seismic events, that occurred in the geothermal field of Los Humeros in Mexico, are located using TRI. So-called sensitivity maps are used to enhance the localization capabilities and to determine the spatial variation in source-location accuracy. In the second part of this study, the located events are characterized by determining the full time-dependent moment tensor. Since no assumption about the source type is made, these moment tensors complement results obtained from more standardized tools.</p>

EARTHQUAKE SOURCE PARAMETER AND FOCAL MECHANISM ESTIMATES FOR THE WESTERN QUEBEC SEISMIC ZONE IN EASTERN CANADA

2017 ◽  
Author(s):  
Alba M. Rodriguez Padilla ◽  
◽  
John Onwuemeka ◽  
John Onwuemeka ◽  
Yajing Liu ◽  
...  
Keyword(s):  
Focal Mechanism ◽  
Earthquake Source ◽  
Source Parameter ◽  
Seismic Zone ◽  
Eastern Canada

Reconstituting the International, 1918–1923

2017 ◽  
Author(s):  
Talbot C. Imlay
Keyword(s):  
Seismic Events ◽  
Great War ◽  
Bolshevik Revolution ◽  
Meaning And Purpose ◽  
Post War ◽  
The Impact ◽  
First Time ◽  
The Great War ◽  
Do So ◽  
Lengthy Process

This chapter examines the post-war efforts of European socialists to reconstitute the Socialist International. Initial efforts to cooperate culminated in an international socialist conference in Berne in February 1919 at which socialists from the two wartime camps met for the first time. In the end, however, it would take four years to reconstitute the International with the creation of the Labour and Socialist International (LSI) in 1923. That it took so long to do so is a testimony to the impact of the Great War and to the Bolshevik revolution. Together, these two seismic events compelled socialists to reconsider the meaning and purpose of socialism. The search for answers sparked prolonged debates between and within the major parties, profoundly reconfiguring the pre-war world of European socialism. One prominent stake in this lengthy process, moreover, was the nature of socialist internationalism—both its content and its functioning.

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