The 1927 earthquakes and aftershocks in the Crimea: relocation based on instrumental data

We used the most complete instrumental data supplied by the global network, a modern velocity model (ak135), and a modified method of generalized beamforming to relocate the Crimean earthquakes of June 26 and September 11, 1927, and for the larger (magnitudes above 4.5) aftershocks that occurred dur...

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Bibliographic Details
Published in:Journal of seismology 2021-04, Vol.25 (2), p.393-417
Main Authors: Morozov, Alexey N., Vaganova, Natalya V., Dulentsova, Ludmila G., Asming, Vladimir E., Evtyugina, Zinaida A.
Format: Article
Language:English
Subjects:
Aftershocks
Archives & records
Beamforming
Earth and Environmental Science
Earth Sciences
Earthquakes
Geophysical surveys
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Original Article
Relocation
Seismic activity
Seismology
Structural Geology
Surveying
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Summary:We used the most complete instrumental data supplied by the global network, a modern velocity model (ak135), and a modified method of generalized beamforming to relocate the Crimean earthquakes of June 26 and September 11, 1927, and for the larger (magnitudes above 4.5) aftershocks that occurred during the year 1927. For the relocation, we collected all available seismic bulletins from the global network using data from the ISC-GEM project (International Seismological Centre-Global Earthquake Model), EuroSeismos project, the ISS (International Seismological Summary) Bulletin, the archive of the Geophysical Survey of the Russian Academy of Sciences bulletins, and the archive of the Russian State Library. There are many onsets of P and S phases as recorded by numerous seismic stations for the two Crimean earthquakes and six aftershocks; the network geometry is favorable for reliable determination of hypocenter parameters. We believe that our results will be a contribution to the study of aftershocks following the 1927 Crimean earthquakes, and this will make it possible to learn new things about the space-time evolution of the seismic process during the active period from 1927 to 1931.
ISSN:1383-4649
1573-157X
DOI:10.1007/s10950-020-09972-x