Regional magnitude Mwa in the Russian Far East
1 Institute of Marine Geology and Geophysics, FEB RAS
2 Sakhalin Branch, Geophysical Survey RAS
Journal: Problems of Engineering Seismology
Tome: 49
Number: 4
Year: 2022
Pages: 60-78
UDK: 550.34.042.43
DOI: 10.21455/VIS2022.4-4
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Safonov
E.P D.A. Regional magnitude Mwa in the Russian Far East // . 2022. Т. 49. № 4. С. 60-78. DOI: 10.21455/VIS2022.4-4
@article{Safonov
E.PRegional2022,
author = "Safonov
E.P, D. A.",
title = "Regional magnitude Mwa in the Russian Far East",
journal = "Problems of Engineering Seismology",
year = 2022,
volume = "49",
number = "4",
pages = "60-78",
doi = "10.21455/VIS2022.4-4",
language = "English"
}
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Keywords: earthquakes, magnitude scale, Sakhalin region, Kuril-Okhotsk region, emulation of waveforms
Аnnotation: The Seismological Regional Information Processing Center (RIPC) “Yuzhno-Sakhalinsk” has recently used the Richter magnitude Mwa to estimate the energy level of Far Eastern earthquakes. To date, this is the most common energy characteristic in the operational catalog of the RIPC. The basis is digital waveforms of regional seismic stations emulated to the characteristics of the Wood–Anderson seismograph. In the present paper, the results of determining the Mwa magnitude in the conditions of the Russian Far East are analyzed. The accuracy of the magnitude determination is estimated, station corrections are obtained. The regression relationship between Mwa and the magnitude of the Japanese Meteorological Agency Mj showed a high similarity of these scales. This made it possible to use Mj as a reference when studying the features of Mwa. The regional network of seismic stations makes it possible to correctly estimate the magnitude of Mwa at a regional distance (up to about 1000 km), including for deep-focus earthquakes (up to 600 km). Transitional relations between Mwa and other mass-determined regional energy characteristics of earthquakes are obtained. The Mwa magnitude scale can be used to estimate the energy level of any earthquakes in the Kuril-Okhotsk and Sakhalin regions in the magnitude range of weak and moderately strong events and is recommended for inclusion in regional catalogs of earthquakes in the Russian Far East.