Deep-seated faults and lineaments, and the location of earthquake epicenters in the Russian northeast on land

Vashchilov, Yu. Ya.; Kalinina, L. Yu.

doi:10.1134/s0742046308030032

Cited by 7 publications

(3 citation statements)

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“…Thus, it appears that the northern area (with conti nental crust) confirms the inference arrived at in ear lier studies for the Magadan land area [Vashchilov and Kalinina, 2008]: maximum seismic activity and maxi mum probability of occurrence for earthquakes of energy class К ≥ 12 occur in those crustal areas with the mean density of faults that have surface expression.…”

Section: Fault Density and Earthquakes In The Sredne Yam Skoi Seismicsupporting

confidence: 77%

Fault density, earthquakes, and the topography of crustal stratification interfaces: Central Magadan Oblast

Gaidai

Kalinina

2011

J. Volcanolog. Seismol.

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This study is concerned with quantitative estimation of the relationship between earthquakes and tectonic crustal fragmentation based on a correlation analysis of fault density with seismicity parameters (the number and energy of earthquakes per unit area) for the Sredne Yamskoi seismic junction and adjacent area. The highest level of seismic activity and the highest probability of earthquake occurrence with energy classes K ≥ 12 within areas that have a continental crust with a well pronounced granite layer occur in those areas with the mean fault density. Within areas with a thinner granite layer in the crust, the most likely seismic events are K ≥ 12 earthquakes that occur in areas with lower fault density. We estimated the relationship between the degree of crustal fragmentation and the topography of stratification interfaces in the crust as identified by new interpretative gravimetry. Zones with the lowest degree of fragmentation tend to be areas where the top of the crystalline basement lies deeper.

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Section: Fault Density and Earthquakes In The Sredne Yam Skoi Seismicsupporting

confidence: 77%

Fault density, earthquakes, and the topography of crustal stratification interfaces: Central Magadan Oblast

Gaidai

Kalinina

2011

J. Volcanolog. Seismol.

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“…Гипоцентры землетрясений рас полагаются в пределах земной коры на глубинах не более 25-30 км. Магнитуда землетрясений не превы шает в среднем ~6.5 [Vashchilov, Kalinina, 2008].…”

Section: краткое описание сейсмических поясов и зон землиunclassified

Seismic Belts and Zones of the Earth: Formalization of Notions, Positions in the Lithosphere, and Structural Control

Шерман¹,

Злогодухова²

2011

Geodyn. Tectonophys.

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This publication is aimed at formalization of the notions of «seismic zone» and «seismic belt». A seismic zone (SZ) is a territory defined and contoured in a technically active area. Within the limits of this territory, more than 10 seismic event with М>3 (К>9) occurred in the specified period of time (typically, 50 years), or the number of seismic event is not below a certain statistically relevant value. The external contour of SZ should be drawn according to the isolines of the corresponding density of registered earthquakes with М≥3, pending no less than three events within the given square area. In each case, selection of contours of SZ should be determined so that it can provide for classification of SZs. SZ should correspond to one or several tectonic structures. The interior structure of SZ can be zoned according to densities of earthquake epicentres.A seismic belt (SB) is a structure with a uniform geodynamic regime, wherein seismic zones are closely spaced. Typi cally, such structures are margins of plates or large intraplate blocks. In real time, SB is generally characterized by a perma nent state of lithospheric stresses. Stress vectors in local segments of SB may differ from the dominant type of stresses. They can be variable due to changes in strike of local and regional faults which control seismicity and also due to various direc tions of zones of the recent lithospheric destruction.The Earth's SBs and SZs are mapped. SBs and a number of most important SZs are briefly described. Main parameters of SBs and SZs are tabulated. Based on the available data on SBs and SZs and taking into account the common geodynamical settings and elongated localities of earthquake foci, we suggest that it is required to evaluate structural factors controlling the seismic process and its components (locations of earthquake foci) at all the hierarchic levels, i.e. seismic belts, seismic zones, fault zones wherein stresses are concentrated, and structures wherein earthquake foci are located.Due to differences in the structural factors of control and scaling of SB and SZ manifestation, criteria for occurrence of earthquakes of various magnitudes are significantly different. Rare catastrophic earthquakes in SB result from the evolution of interplate and large interblock margins in the geochronological scale intervals and/or disturbances of the evolution regu larities due to catastrophic seismic event in the adjacent SB. Developing tectonophysical models of SBs is a future challenge.In SZ, earthquakes of medium magnitudes and rare strong seismic events results from the impact of strain waves on the megastable state of the recent lithospheric destruction zones which comprise the SZ structure. Time spans between seismic events in SZ are estimated in real time scales (decades, years, months) and thus can be considered instant in relation to peri ods of the geological evolution of interplate margins and other large structural margins (hundred thousand years, million years). In terms of the given time evaluation, the ...

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“…The epicenters of earthquakes are not random, but rather associated with lineaments and their connecting segments. According to the modern understanding of seismic processes, high tectonic stresses that cause earthquakes usually concentrate at the intersections or bends of linear boundaries separating blocks of the Earth's crust [14][15]. Research on stress pattern changes around earthquake epicenters has shown significant changes in the lineaments and observable anomalies before impending earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Study of the seismic activity of the Almalyk-Angren industrial zone based on lineament analysis

SİCHUGOVA,

FAZİLOVA

2024

International Journal of Engineering and Geosciences

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The main purpose of this work is to study earthquake precursors using lineament analysis for an earthquake of magnitude Mw3.0 that occurred in 2019 on the territory of the Almalyk-Angren industrial zone in Uzbekistan. The Landsat 8 satellite images were processed using the automated lineament detection method in the LEFA software. The processing steps included to detect line elements in raster images, calculate the characteristics of the spatial distribution of line elements, combining collinear linear elements into lineaments. The analysis of the cyclicality of precursors before and after earthquakes were based on the study of the distribution of the lineaments trend in the study area using rose diagrams and lineaments density maps. The results showed a change in the dynamics of lineament structure. The statistics of the number of lineaments showed that their increase begins almost 20 days before the event, reaches its maximum about 1 – 2 days before the earthquake, and decreases starting from 14 days after the earthquake, and has a minimum value in 1 – 2 months. The main trends observed in the lineament map showed dominant trend in NS, WE, NW-SE directions.

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Deep-seated faults and lineaments, and the location of earthquake epicenters in the Russian northeast on land

Cited by 7 publications

References 0 publications

Fault density, earthquakes, and the topography of crustal stratification interfaces: Central Magadan Oblast

Fault density, earthquakes, and the topography of crustal stratification interfaces: Central Magadan Oblast

Seismic Belts and Zones of the Earth: Formalization of Notions, Positions in the Lithosphere, and Structural Control

Study of the seismic activity of the Almalyk-Angren industrial zone based on lineament analysis

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