The 1927 earthquakes and aftershocks in the Crimea: relocation based on instrumental data
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ORIGINAL ARTICLE
The 1927 earthquakes and aftershocks in the Crimea: relocation based on instrumental data Alexey N. Morozov & Natalya V. Vaganova & Ludmila G. Dulentsova & Vladimir E. Asming & Zinaida A. Evtyugina
Received: 18 May 2020 / Accepted: 4 November 2020 # Springer Nature B.V. 2020
Abstract 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 A. N. Morozov (*) : L. G. Dulentsova Geophysical Survey of the Russian Academy of Sciences, Lenina av. 189, Obninsk, Kaluga Region 249035, Russia e-mail: [email protected] A. N. Morozov : N. V. Vaganova N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences, Severnoj Dviny St., 23, Arkhangelsk 163000, Russia
N. V. Vaganova e-mail: [email protected] V. E. Asming : Z. A. Evtyugina Kola Branch of Geophysical Survey of the Russian Academy of Sciences, Fersmana St., 14, Apatity 184209, Russia
V. E. Asming e-mail: [email protected]
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 spacetime evolution of the seismic process during the active period from 1927 to 1931. Keywords Crimean earthquakes . Relocation procedure . Crimea . Instrumental seismicity
1 Introduction There are many studies in seismology to revise hypocenter parameters for previous earthquakes that occurred during the historical and the early instrumental period. The revision generally occurred sometime after the event, when new macroseismic or instrumental data had become available along with refined velocity models, advanced location methodologies, and mathematical algorithms (Ayele and Kulhánek 2000; Mäntyniemi 2008; Tang et al. 2010; Tatevossian et al. 2011; Nikonov 2013; Noskova 2016; Morozov et al. 2018a, b; Tatevossian and Mokrushina 2018; Mäntyniemi et al. 2020). At present, projects such as the ISC-GEM (International Seismological Centre-Global Earthquake Model) catalog (Storchak et al. 2013) and EuroSeismos (ES), added to freely available archival materials at the
J Seismol
Geophysical Survey of the Russian Academy of Sciences, provide oppo
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