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Title: SEISMOLOGICAL ANALYSIS OF THE SWARM TYPE SEISMICITY IN THE REGION OF VELINGRAD, BULGARIA
SEISMOLOGICAL ANALYSIS OF THE SWARM TYPE SEISMICITY IN THE REGION OF VELINGRAD, BULGARIA

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Stela Simeonova; Plamena Raykova; Dimcho Solakov
10.5593/sgem2022/1.1/s05.065
10.5593/sgem2022/1.1
1314-2704
978-619-7603-38-5
English
22
1.1
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Applied and Environmental Geophysics
Тhe space-time distribution of earthquakes is of substantial importance for understanding the physics of the earthquake generation process. Earthquakes can be analyzed as a time series of events that result from the released strain in the earth's crust. The study of the space-time distribution of earthquakes using statistical methods reveals many of their characteristics. Sequences of seismic events affect both spatial and time distribution of earthquakes. It is necessary to know the statistical characteristics of the different seismic clusters and to reflect their impact in the general research related to seismicity. In the study, we analyze the swarm type sequence located in the vicinity of the town of Velingrad. The region is characterized with moderate seismic activity. Moreover, a reduced number of small earthquakes have also been registered in the recent past. About 30 events with magnitude in the range of 1.2?M?3.0 are recorded at Bulgarian seismological network in a time period of 10 days. The events are localized on and close to a defined fault structure. Most of the swarm events are with a magnitude in the range of 2.0-2.5. The earthquakes are located in the Earth’s crust at a depth up to 15 km. Rapid transition to background seismicity is observed after the generation of the strongest earthquakes in of the sequence.
[1] Credner, H., Das vogtlandisch-erzgebirgische Erdbeben vom 23. November 1875, Z. Ges. Naturwiss, 48, 246–269, 1876.
[2] Mogi, K., Some Discussions on Aftershocks, Foreshocks and Earthquake SwarmsThe Fracture of a Semi-Infinite Body Caused by an Inner Stress Origin and Its Relation to the Earthquake Phenomena (Third Paper), Bulletin of the Earthquake Research Institute, 41, 615-658, 1963.
[3] Dreger, D.S., Tkalcic, H., Jonston, M., Dilational processes accompanying earthquakes in the Long Valley Caldera, Science 288, 122–125, 2000.
[4] Lees, J.M., Multiplet analysis at Coso geothermal, Bull. Seismol. Soc. Am. 88, 1127– 1143, 1998.
[5] Wyss, M., Shimazaki, K., Wiemer, S., Mapping active magma chambers by b values beneath the off-Ito volcano, Japan. J. Geophys. Res, 102 (B9), 20,413–20,422, 1997.
[6] Watzof S., Earthquakes in Bulgaria during XIX century, Central Meteor. St., Imprimerie de I‘Etat, Sofia, pp. 93, 1902.
[7] Raykova Pl. Characteristics of for-aftershock and swarm type activity for the territory of Bulgaria and surroundings. Ph.D thesis, NIGGG-BAS, S., pp. 47, 2017.
[8] Gutenberg, B. and Richter, C. F., Frequency of earthquakes in California, B. Seismol. Soc. Am., 34, 185–188, 1944.
[9] Sykes, L. R., Earthquake swarms and sea-floor spreadings, J. Geophys. Res., 75, 6598- 6611, 1970.
[10] Ibs-von Seht, M., Plenefisch, T., Klinge, K., Earthquake swarms in continental rifts - A comparison of selected cases in America, Africa and Europe, Tectonophysics, 452, 66–77, 2008.
[11] GFI Report, Seismic zoning of the Republic of Bulgaria in accordance with the requirements of Eurocode 8 "Seismic provision of building structures" and development of maps for seismic zoning taking into account seismic hazard for the country, Part II, BAS, Geophysical Institute, Sofia, pp. 150, 2008.
[12] Popova M., Oynakov E., Milkov Y., Buchakchiev V., Dragomirov D., Seismicity on the territory of Bulgaria and the adjacent lands recorded by NOTSSI in 2021, Bulgarian Geophysical Journal, 2020, Vol. 44, Bulgarian Academy of Sciences, -, 2021.
[13] Christoskov L., Dimitrova L., Solakov D., Digital broadband seismometers of NOTSSI for practical magnitude determinations of P waves, BGS, Comptes Rendus de L'Academie Bulgare des Sciences, 65 (5), 653-660, 2012.
[14] Basili R., Kastelic V., Demircioglu M., Garcia Moreno D., Nemser E., Petricca P., Sboras S., Besana-Ostman G., Cabral J., Camelbeeck T., Caputo R., Danciu L., Domac H., Fonseca J., Garcia-Mayordomo J., Giardini D., Glavatovic B., Gulen L., Ince Y., Pavlides S., Sesetyan K., Tarabusi G., Tiberti M., Utkucu M., Valensise G., Vanneste K., Vilanova S., Wossner J., The Eur. Database of Seism. Faults (EDSF), http://diss.rm.ingv.it/share-edsf/, doi: 10.6092/INGV.IT-SHARE-EDSF, 2013.
This work has been carried out in the framework of the National Science Program "Environmental Protection and Reduction of Risks of Adverse Events and Natural Disasters", approved by the Resolution of the Council of Ministers № 577/17.08.2018 and supported by the Ministry of Education and Science (MES) of Bulgaria (Agreement № Д01-363/17.12.2020).
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https://doi.org/10.5593/sgem2022/1.1/s05.065
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Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
559-566
04 - 10 July, 2022
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seismicity, sequences, swarm, town of Velingrad