Seismological Analysis of the 2006 Kardzhali Earthquake
Seismological Analysis of the 2006 Kardzhali Earthquake

Author(s): Plamena Raykova, Dimcho Solakov, Stela Simeonova
Subject(s): Economy, National Economy, Supranational / Global Economy, Business Economy / Management, Energy and Environmental Studies
Published by: Национално издателство за образование и наука „Аз-буки“
Keywords: Aftershocks; P and S-waves spectra; stress drop; seismic moment; seismic moment magnitude
Summary/Abstract: Studying of the space-time distribution of earthquakes is very important for understanding the physics of the earthquake generation process. The 2006 MW4.7 KARDZHALI earthquake was followed by an intensive aftershock activity. We analyze the space-temporal pattern of earthquake distribution in the aftershock sequence of the main event. We find that both space and temporal distribution of aftershocks shows non-random features. In this study P- and S-wave spectra for earthquakes from the seismic cluster (main earthquake - aftershocks) are generated. Earthquake parameters: seismic moment, source radius, stress drop are estimated applying Brune model for the MW4.7 quake and five aftershocks with magnitude МW in the interval 3.3 ÷ 3.7. The estimated stress drop value for the main event is within the expected range for moderate earthquakes (43 bars for the P-wave and approximately 65 bars for the S – wave).

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