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Central Baikal shallow-focus earthquakes localization updated technique
Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences
Journal: Problems of Engineering Seismology
Tome: 51
Number: 4
Year: 2024
Pages: 62-72
UDK: 550.34.06.013.3, 550.34.06.013.24
DOI: 10.21455/VIS2024.4-5
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Belyashov A.V. Central Baikal shallow-focus earthquakes localization updated technique // . 2024. Т. 51. № 4. С. 62-72. DOI: 10.21455/VIS2024.4-5
@article{BelyashovCentral2024,
author = "Belyashov, A. V.",
title = "Central Baikal shallow-focus earthquakes localization updated technique",
journal = "Problems of Engineering Seismology",
year = 2024,
volume = "51",
number = "4",
pages = "62-72",
doi = "10.21455/VIS2024.4-5",
language = "English"
}
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Keywords: Central Baikal earthquakes, Wadati diagram, events localization, VP/VS ratio
Аnnotation: During the Central Baikal earthquakes archival records (2001) analysis it was found that the correct determination of T0 and VP/VS values is difficult for the separate events (with VP/VS >= 1.77). Improvement of the earthquakes localization technique using the integrated Wadati diagram plotting for all of the analyzed events with the VP/VS median line fixation has been done. For the avoidance of T0 local errors moving to the integrated Wadati diagram it has been suggested to carry out the preliminary localization procedure of each earthquake by force of forward problem solving using method of circles and isotropic model with 6.15 km/s P-wave velocity. Using the fixed slope of VP/VS line the entering designed parameters for all the events has been defined and 2001-year crust events relocation has been carried out in the Hypoellipse software. General reduction of the relocated hypocenters depth relating to the initial events with average difference up to 4.8 km is noticed.
