Seismological Monitoring in Latvia

Nikulins, Valerijs

doi:10.31905/bketrt2r

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Позначення: 1 -сейсмічні станції; 2 -границя Східно-Балтійського регіону; 3 -Teisseyre-Tornquist зона У даній роботі локалізація гіпоцентру землетрусу виконувалась з використанням програми локалізації SEISAN. Оскільки методика визначення фокального механізму методом інверсії хвильових форм передбачає, що швидкісна модель має бути відомою, то в даній роботі використано п'ятишарувату модель baltic 08 (Nikulins, 2020). Автори даної статті на основі методу інверсії хвильових форм визначають фокальний механізм даного землетрусу, використовуючи записи на трьох сейсмічних станціях: PABE, MTSE, SLIP, які належать до Балтійської віртуальної сейсмологічної мережі BAVSEN.…”

Section: рис 1 балтійська віртуальна сейсмологічна мережа Bavsenunclassified

Focal Mechanism of the Lithuanian Earthquake of Based on Waveform Inversion

Malytskyy¹,

Nikulins

2021

VKNUGEOL

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The aim: Determination of focal mechanism of Lithuanian earthquake of 12.06.15 (t0 = 08:18:26.4; 55.52° N, 21.40° E; hs = 0.9 км.; ML = 2.6) by waveform inversion using direct waves and a limited number of stations. Method: Matrix method is used for modelling of seismic wave propagation in the medium modelled as horizontally layered heterogeneous elastic structure. There were obtained the relations of displacement waves on the free surface that were used for seismic tensor determination using only direct P- and S- waves. Determination of seismic tensor and the focal mechanism on the base of developed method for a point source is described. Thus, based on forward modeling, numerical techniques are developed for the inversion of observed waveforms for the components of moment tensor. Results: In the paper, a method is presented for the focal mechanism determination of Lithuanian earthquake of 12.06.15 (ML = 2.6) by waveform inversion using limited number of stations. The focal mechanism is determined using the data from two stations: PABE, SLIТ and from three stations: PABE, MTSE, SLIТ. These seismic stations are the part of BAVSEN (BalticVirtualSeismicNetwork). Scientific novelty: 1. In the paper, a method is presented for moment tensor inversion for the focal mechanism determination of events with a low seismicity. The East Baltic region (EBR) is the region with low seismicity. 2. The focal mechanism is determined using the data from a limited number of stations. Practical significance: The results of focal mechanism determination can be used to study seismicity for regions with a low seismicity using a limited number of stations.

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Section: рис 1 балтійська віртуальна сейсмологічна мережа Bavsenunclassified

Focal Mechanism of the Lithuanian Earthquake of Based on Waveform Inversion

Malytskyy¹,

Nikulins

2021

VKNUGEOL

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SEISMICITY of the EAST BALTIC REGION in 2016–2017

Nikulin

2022

Earthquakes in Northern Eurasia

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Information on seismic monitoring in the East Baltic region for 2016–2017 is presented. During this period of time, several tectonic earthquakes occurred, the epicenters of which are located in the north and northwest of Estonia and in the area of Lake Võrtsjärv. The territory of Estonia and the adjacent waters of the Baltic Sea are still the most seismically active parts of the East Baltic region. Attention is drawn to the inherited nature of seismicity, i.e. in the areas of modern earthquakes, earthquakes had already occurred before the instrumental period. Another feature of several earthquakes in the East Baltic region is their association with meteorite craters, which are most often found in the East Baltic region in Estonia and near it, in the Baltic Sea. As before, the bulk of seismic information is associated with man-made explosions in industrial quarries and in the Baltic Sea. The identification of earthquakes of small magnitude remains an urgent problem.

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Seismological Monitoring in Latvia

Abstract: Valerijs G. Ņikuļins reports on seismological monitoring in Latvia for the Summary of the Bulletin of the ISC.

Cited by 2 publications

References 5 publications

Focal Mechanism of the Lithuanian Earthquake of Based on Waveform Inversion

Focal Mechanism of the Lithuanian Earthquake of Based on Waveform Inversion

SEISMICITY of the EAST BALTIC REGION in 2016–2017

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