Uglegorsk earthquake on September 13, 2020 (Sakhalin Island): preconditions for the occurrence and results of observations in the epicentral zone

Semenova, E.P.; Boginskaya, N.V.; Kostylev, D.V.

doi:10.30730/gtrz.2020.4.4.474-485

Cited by 4 publications

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“…The focal mechanism of the earthquake in 2000 and its strongest aftershocks are identi ed in [Poplavskaya et al, 2011] as reverse faults (or normal faults), which is typical for most earthquakes occurring on Sakhalin Island. A movement in the focus of the earthquake of September 13, 2020, and its largest aftershock (Mw=4.5) has realized under the conditions of horizontal sublatitudinal extension and near-horizontal submeridional compression and is classi ed as strike-slip fault [Semenova et al, 2020]. Considering that the West Sakhalin fault manifests itself as a system of interlinked normal and reverse faults, the type of seismic dislocations of the earthquakes of September, 2020, is clearly unusual for the studied area.…”

Section: Research Methods and Resultsmentioning

confidence: 89%

“…Several crustal earthquakes of M > 4.5 with a macroseismic effect occurred in the studied area over the 20 years that had passed since the Uglegorsk-Ain earthquake in 2000, for example, the earthquake on February 8, 2003, with MLH = 5.1 [Fokina et al, 2009]. However, a seismic event with ML = 4.8 on September 13, 2020, which occurred in the area of active development of coal elds, had the greatest resonance [Semenova et al, 2020].…”

Section: Study Objectmentioning

confidence: 98%

“…In the context of the foregoing, strong earthquakes associated with movements along faults located in coal mining areas are of particular interest, such as the earthquake with M = 4.8 that occurred on September 13, 2020, [Semenova et al, 2020] in the immediate vicinity of the Solntsevsky coal mine. The features of this seismic event occurrence will be considered in the sections below.…”

Section: Study Objectmentioning

confidence: 99%

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Seismic activity in the focus of the Uglegorsk earthquakes, Sakhalin Island in relevance to intensive development of coal deposits

Kostylev

Boginskaya

Zakupin

2021

Preprint

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Induced seismicity is an increase in seismic activity caused by the human engineering. An example of such activity is the mineral exploration, large water reservoirs construction, exploitation of underground oil and gas storages, etc. The authors studied the seismicity in the Uglegorsky district of Sakhalin region, where the Solntsevskoye brown coal field is located, which is the most promising in the island. Its area is over 100 sq. km, and productive strata of the Verkhneduiskaya formation with a thickness of up to 600 m contains 12 coal seams, 8 of which are working. Active mining of brown coal is carried out at the Solntsevsky coal mine, and blasting operations are performed on a large scale, that, as a result, does not exclude the relation of the seismic process to technogenic seismicity. The earthquake recurrence curves for two decades beginning from 2000 to the present were constructed in the work to compare the characteristics of the seismic regime in the studied area. The difference in the slope angle of recurrence graph during the period of 2011-2020 (the period of the most active development of the Solntsevsky coal mine) from the previous decade is quite significant. The maps of spatiotemporal distribution of seismic events epicenters in the vicinity of Solntsevsky coal mine are constructed. The contraction of zones of seismic events concentration to the mining areas, first of all to the Solntsevsky coal mine, have been found. Such a combination allows us to talk about an increase in seismicity of the region during the last years and change in its character from the natural to a mixed natural and technogenic. The focal mechanisms of the largest earthquakes occurred in the Uglegorsky district have been constructed in order to prove the change in seismicity character and reasons for the earthquake occurrence in the studied area. The mechanisms of seismic events of 2020 are classified as strike-slip faults, that is not character for the most earthquakes on the territory of Sakhalin Island. The authors made an attempt to determine the regularities of the parameters of the produced blasts and earthquakes through dynamic parameters of the seismic events foci by means of studying the frequency content of earthquakes and blasts in order to determine a corner frequency from the focal velocity spectrum.

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Section: Research Methods and Resultsmentioning

confidence: 89%

Section: Study Objectmentioning

confidence: 98%

Section: Study Objectmentioning

confidence: 99%

See 1 more Smart Citation

Seismic activity in the focus of the Uglegorsk earthquakes, Sakhalin Island in relevance to intensive development of coal deposits

Kostylev

Boginskaya

Zakupin

2021

Preprint

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“…The existence of induced seismicity around mining enterprises has been proven in many studies [1,2]. The Uglegorsk earthquake with Mw = 4.8 (I 0 = 5) that occurred on Sakhalin Island on September 13, 2020, and the aftershocks that followed it were located in the area of active coal mining at the Solntsevsky open pit coal mine, which does not exclude the connection of the seismic process with technogenic seismicity [3]. The Solntsevsky open pit coal mine, located in the Uglegorsk district of the Sakhalin Region, is a key production asset of East Mining Company [4].…”

Section: Introductionmentioning

confidence: 99%

The first results of the seismic monitoring system of the Solntsevsky open pit coal mine area (on Sakhalin Island)

Kostylev

Boginskaya

2021

IOP Conf. Ser.: Earth Environ. Sci.

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In 2021, work began as a part of the implementation of the decision of the protocol of the Sakhalin branch of the Russian Expert Council on earthquake prediction, seismic hazard and risk assessment dated October 6, 2020 on detailed monitoring in the area of active coal mining at the Solntsevsky open pit coal mine (Sakhalin Island). New points of seismic monitoring were installed directly in the area of the open pit coal mine. Integration of real-time data received from the points in real time into a unified seismic monitoring system in the Sakhalin Region was ensured. The results of registration of seismic events of various origins since the commissioning of the stations are presented. A significant increase in the accuracy of the determined epicenters and the possibilities of determining earthquakes and industrial explosions has been noted. The results of the monitoring system for studying the landslide process in the area of the open pit coal mine, as well as the probable factors that caused the landslide, are shown. The developed monitoring system allows for representative registration of seismic events with ML ≥ 0.8 in the immediate vicinity of open pit coal mine, which makes it possible to control blasting operations with increased accuracy, as well as weak and possible induced seismicity formed as a result of a constant technogenic impact on the subsoil.

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“…The epicentral intensity was I 0 =5 according to MSK-64. The seismic process lasted for about 2 days, the most of the aftershocks were recorded during the first 7 hours [4]. The epicenters of the earthquakes are located within the Western Sakhalin fault structure.…”

Section: Introductionmentioning

confidence: 99%

2000 Uglegorsk earthquake

Polets

2021

IOP Conf. Ser.: Earth Environ. Sci.

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The paper presents the results of waveform inversion of the Mw 6.8 August 4 (5), 2000 Uglegorsk earthquake (Sakhalin Island, Russia). The detailed rupture process of the 2000 Uglegorsk earthquake was simulated using the waveform inversion method. The average parameters were calculated for both nodal planes. Waveform inversion was carried out on the basis of Global Seismographic Network (GSN) data. Only P-waves from BHZ channels of all stations from the GSN were used. The simulated source parameters included a double-couple source, the scalar seismic moment, the source time function, and the slip directions. The performed studies made it possible to investigate the features of the rupture development and the amplitude of displacements along the east and west-dipping nodal planes of the August 4 (5), 2000 Uglegorsk earthquake. The obtained P-slip model for the 2000 Uglegorsk earthquake source area is in good agreement with the surface manifestations of the rupture according to the field geology data and the results of geodetic inversion.

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Uglegorsk earthquake on September 13, 2020 (Sakhalin Island): preconditions for the occurrence and results of observations in the epicentral zone

Cited by 4 publications

References 0 publications

Seismic activity in the focus of the Uglegorsk earthquakes, Sakhalin Island in relevance to intensive development of coal deposits

Seismic activity in the focus of the Uglegorsk earthquakes, Sakhalin Island in relevance to intensive development of coal deposits

The first results of the seismic monitoring system of the Solntsevsky open pit coal mine area (on Sakhalin Island)

2000 Uglegorsk earthquake

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