Evaluation of the Detection and Location Capability of the Seismic Network in the Western Part of the North Caucasus Using Network Layout and Local Microseismic Noise Level

Malovichko, A. A.; Габсатарова, И. П.; Dyagilev, R. A.; Mekhryushev, D. Yu.; Zvereva, A. S.

doi:10.3103/s0747923921020274

Cited by 11 publications

(5 citation statements)

References 10 publications

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“…3) (GS RAS), which is registered in the International Federation of Digital Seismograph Networks (FDSN) with the network code RU. For more information on the network, see Malovichko et al (2021). The KBZ station (Fig.…”

Section: Seismic Data Usedmentioning

confidence: 99%

“…These two stations recorded only some strong earthquakes in the western zone for a long time. The network developed only at the end of the first decade of the 21st century (Malovichko et al 2021). For this reason, we have only now accumulated enough seismic data to study attenuation in the lithosphere of this region.…”

Section: Seismic Data Usedmentioning

confidence: 99%

“…Fig 3.Map of the seismic network with isolines of the detection levels representing magnitudes ML(Malovichko et al 2021) …”

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confidence: 99%

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Regional variation of coda Q in Northwest Caucasus

2023

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Coda Q has been studied in the North-West Caucasus region using 267 earthquakes and 17 stations from the network of the Geophysical Survey, Russian Academy of Sciences. This is the first Qc study for the region using such a large dataset. The average frequency-dependent coda Q relationship is Qc=90±21•f 1.02±0.11 . This value compares closely to other similar tectonic areas in the world where the same processing parameter had been used. Three specific zones, two in the Greater Caucasus tectonic area and one east of the Ciscaucasian trough area, were studied separately. There was a clear difference in Qc between the zones, particularly for the Ciscaucasian trough area which shows a higher Qc than the 2 other zones. However, the difference between the zones became smaller when using long lapse times tending to give a constant Qc as a function of lapse time. For longer lapse time it is assumed that a large part of the coda waves passes the mantle. The 2 zones in Greater Caucasus now had a similar Qc while the East zone in the Ciscaucasian trough still gave the highest values. We contribute this difference to differences in attenuation in the mantle under the two tectonic areas. In our area, there is then a clear difference in Qc for the 3 study areas in the crust but in the mantle the difference is mainly between the two tectonic zones.

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Section: Seismic Data Usedmentioning

confidence: 99%

Section: Seismic Data Usedmentioning

confidence: 99%

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Regional variation of coda Q in Northwest Caucasus

2023

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“…At higher frequencies (from 1 to 20 Hz) seismic noise includes «cultural» or, in other words, anthropogenic and technogenic noise (industrial production, transport and other human activities) (Bormann & Wielandt, 2013 ). Considering, that most stations have an average level of noise power in comparison with average world Peterson noise curves and at the frequencies above 1 Hz in the daytime, the noise level increases by at least an order of magnitude due to anthropogenic activity (Malovichko et al, 2020 ). Growth of modern cities, rapid development of their transport and industrial infrastructure inevitably bring to greater anthropogenic impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Change in the Level of Microseismic Noise During the COVID-19 Pandemic in the Russian Far East

Boginskaya

Kostylev

2022

Pure Appl. Geophys.

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With the outbreak of the COVID-19 pandemic, many seismologists all over the world have noted a sharp (up to 30–50%) decrease in the daily background seismic noise during the period from March to May, 2020 (Lecocq et al., Science 369(6509):1338–1343, 2020). The authors studied the influence of the self-isolation regime introduced in the Russian Federation from March 30, 2020 and, as a consequence, the restriction of the work of public institutions and the mobility of the population, on the quality of seismological observations at seismic stations in large cities of the Russian Far East for the period from March 23, 2020 to April 12, 2020. The work analyses the records of seismic noise by the seismic stations of Khabarovsk and Vladivostok located in busy parts of the cities and, accordingly, strongly influenced by anthropogenic impact, as well as it analyses the records of the Yuzhno-Sakhalinsk seismic station located in the relatively «calm» part of the city. Power spectra and temporal variations of microseismic noise levels for the listed above seismic stations were constructed based on the data of broadband seismometers records in the range of 1–20 Hz. The analysis of noise level variations with the data on the population mobility was carried out on the basis of self-isolation index by Yandex, which shows the level of town activity over a selected period. The main sources of the increased microseismic noise at seismic stations were identified.

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“…At higher frequencies (from 1 to 20 Hz) seismic noise includes «cultural» or, in other words, anthropogenic and technogenic noise (industrial production, transport and other human activities) [Bormann, Wielandt, 2013]. Considering, that most stations have an average level of noise power in comparison with average world Peterson noise curves and at the frequencies above 1 Hz in the daytime, the noise level increases by at least an order of magnitude due to anthropogenic activity [Malovichko et al, 2020]. Growth of modern cities, rapid development of their transport and industrial infrastructure inevitably bring to greater anthropogenic impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Change In the Level of Microseismic Noise During the COVID-19 Pandemic in the Russian Far East

Boginskaya

Kostylev

2021

Preprint

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With the outbreak of the COVID-19 pandemic, many seismologists all over the world have noted a sharp (up to 30-50%) decrease in the daily background seismic noise during the period from March to May, 2020 [Lecocqetal., 2020]. The authors studied the influence of the self-isolation regime introduced in the Russian Federation from March 30, 2020 [On the declaring ..., 2020] and, as a consequence, the restriction of the work of public institutions and the mobility of the population, on the quality of seismological observations at seismic stations in large cities of the Russian Far East for the period from March 23, 2020 to April 12, 2020. The work analyses the records of seismic noise by the seismic stations of Khabarovsk and Vladivostok located in busy parts of the cities and, accordingly, strongly influenced by anthropogenic impact, as well as it analyses the records of the Yuzhno-Sakhalinsk seismic station located in the relatively «calm» part of the city. Power spectra and temporal variations of microseismic noise levels for the listed above seismic stations were constructed based on the data of broadband seismometers records in the range of 1-20 Hz. The analysis of noise level variations with the data on the population mobility was carried out on the basis of self-isolation index by Yandex, which shows the level of town activity over a selected period. The main sources of the increased microseismic noise at seismic stations were identified.

show abstract

Evaluation of the Detection and Location Capability of the Seismic Network in the Western Part of the North Caucasus Using Network Layout and Local Microseismic Noise Level

Cited by 11 publications

References 10 publications

Regional variation of coda Q in Northwest Caucasus

Regional variation of coda Q in Northwest Caucasus

Change in the Level of Microseismic Noise During the COVID-19 Pandemic in the Russian Far East

Change In the Level of Microseismic Noise During the COVID-19 Pandemic in the Russian Far East

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