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ANALYSIS OF SEISMICITY IN SOFIA SEISMOGENIC ZONE

Dimcho Solakov, Stela Simeonova, Plamena Raykova, Irena Aleksandrova

First published: 2020-09-20https://doi.org/10.5593/sgem2020/1.2/s05.056View metrics

Abstract

The territory of Bulgaria represents a typical example of high seismic risk area in the eastern part of the Balkan Peninsula. The spatial distribution of seismicity in Bulgaria is uneven, which gives reason to group earthquakes into geographically defined zones - seismogenic zones. In the present study the Sofia seismogenic zone will be examined. Sofia seismogenic zone is located in southwestern Bulgaria - the area with pronounces tectonic activity and proved crustal movement. The capital of Bulgaria - the city of Sofia represents a typical example of high seismic risk area. Over the past centuries, the city of Sofia has experienced strong earthquakes. In historical aspect, it is worth to mention the 1818 (I0=8-9 MSK) and the 1858 (I0=9 MSK) earthquakes occurred near the city of Sofia. The 1858 earthquake caused heavy destruction to the city and the appearance of thermal spring. During the 20th century the strongest event occurred in the vicinity of the city of Sofia is the 1917 earthquake with MW5.7 (I0=7-8 MSK). Almost a century later (95 years after the 1917 earthquake) an earthquake hit Sofia seismogenic zone, on May 22nd, 2012 with moment magnitude MW5.6 (I0=7-8 MSK). In nowadays Sofia zone is characterized by a long quiescence for strong events. Moreover, a reduced number of small earthquakes have also been registered in the recent past. The manifold purpose of our study is first to examine seismicity in Sofia seismogenic zone and surroundings from the past to nowadays, then to analyze the space-temporal pattern of earthquake distribution in the zone. The prime result of our paper is the discovery that the space - temporal distribution of earthquakes in the Sofia seismogenic zone is non-uniform both in space and time.

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Publication details

Title
ANALYSIS OF SEISMICITY IN SOFIA SEISMOGENIC ZONE
Authors
Dimcho Solakov, Stela Simeonova, Plamena Raykova, Irena Aleksandrova
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th International Multidisciplinary Scientific GeoConference Proceedings SGEM 2020, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2020
Pages
435-442
SWS Citekey
Solakov20205435442
ISSN
1314-2704
ISBN
978-619-7603-05-7
Language
en
Publication type
Conference Paper
Keywords
earthquakehistorical and instrumental seismicitySofia seismogenic zone
References1

  1. S. Simeonova, D. Solakov, I. Aleksandrova, P. Raykova, V. Protopopova, 2015. The 2012 Mw5.6 earthquake in Sofia seismic zone and some characteristics of the aftershock sequence. Bulgarian Chemical Communications, Volume 47, Special Issue B (pp. 397–404)

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