Seismic moment tensor and focal mechanism of the October 9, 2023 earthquake in Eastern Slovakia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00600678" target="_blank" >RIV/67985891:_____/24:00600678 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.23939/jgd2024.01.005" target="_blank" >https://doi.org/10.23939/jgd2024.01.005</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.23939/jgd2024.01.005" target="_blank" >10.23939/jgd2024.01.005</a>

Result language

angličtina

Original language name

Seismic moment tensor and focal mechanism of the October 9, 2023 earthquake in Eastern Slovakia

Original language description

The accuracy of the focal mechanism solution mainly depends on the number of stations used and becomes problematic especially in the case of weak earthquakes and sparse networks. In our study, we retrieve the seismic moment tensor of the M=5 earthquake on 9 October 2023 (18:23:09 UTC, 21.783 degrees E, 49.086 degrees N, depth 11.5 km) in Eastern Slovakia from its records at only four seismic stations. Our seismic moment tensor inversion is based on the point source approach and the use of only direct waves calculated by the matrix method. Displacements on the surface of an elastic, horizontally-layered medium are generated using the frequency-wavenumber integration technique. The advantage of using only direct Pand Swaves in our inversion method is that they are less sensitive to path effects compared to reflected and converted waves, which reduces the impact of an inaccurate velocity structure and improves the accuracy and reliability of the result. Based on the forward modeling, a numerical technique was developed for the inversion of the observed waveforms for the components of the moment tensor M(t) using the generalized inversion solution. Before applying our method to the earthquake of October 9, 2023, it was also tested on the April 23, 2020 earthquake (23:18:26.42 UTC, 21.945 degrees E, 48.781 degrees N, magnitude M=5, depth 9 km), also in Eastern Slovakia, using data from only three stations. The resulting versions of the mechanism compare well with a very reliable version previously determined from the polarities of the first P-waves at a much larger number of stations, which only confirms the reliability of our inversion method and the very possibility of obtaining useful results from data of only limited number of stations.n

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Geodynamics

ISSN

1992-142X

e-ISSN

2519-2663

Volume of the periodical

36

Issue of the periodical within the volume

1

Country of publishing house

UA - UKRAINE

Number of pages

7

Pages from-to

5-11

UT code for WoS article

001281638100001

EID of the result in the Scopus database

2-s2.0-85200562932