Temporal Characteristics of the February 6, 2023 MW7.8, Turkey Earthquake Aftershock Sequence

Authors

  • Plamena Raykova National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences
  • Dimcho Solakov National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences
  • Stela Simeonova National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences

DOI:

https://doi.org/10.7546/CRABS.2024.03.07

Keywords:

aftershocks, temporal distribution, 2023 Turkey MW7.8 earthquake

Abstract

The devastating earthquake with moment magnitude MW7.8, (local magnitude ML=7.5) which occurred in the East Anatolian Fault Zone, westwards of Gaziantep, Turkey on February 6, 2023 was followed by an intensive aftershock activity. Studying time distribution of aftershocks is important for understanding physics of the earthquake generation process.

In the present study temporal pattern of aftershock sequence of the 2023 MW7.8 Turkey earthquake is analyzed. Because of the factors such as location and radiation pattern and the cumulative nature of building damage, aftershocks can cause more damage than the main shock. The temporal clustering of aftershocks is a dominant non-random element of the seismicity, so when the clusters are removed, the remaining activity can be modelled (as first approximation) as a Poisson process.

On the assumption that aftershocks are distributed in time as a non-stationary Poisson process, we use the maximum likelihood method for estimating the parameters (K, c and p) of the modified Omori formula. For testing the goodness of fit between the aftershock occurrence and different statistical models, a transformation from the time scale t to a frequency-linearized time scale τ  is applied. Akaike's information criteria is used to select the best model for the temporal distribution of aftershocks.

It has been found that temporal distribution of the 2023 Turkey earthquake aftershocks is dominated by the classic power law decay in time and suggests the existence of secondary aftershock activity.

Author Biographies

Plamena Raykova, National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences

Mailing Address:
National Institute of Geophysics, Geodesy and Geography,
Bulgarian Academy of Sciences,
Akad. G. Bonchev St, Bl. 3, 1113 Sofia, Bulgaria

E-mail: plamena.raikova@gmail.com

Dimcho Solakov, National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences

Mailing Address:
National Institute of Geophysics, Geodesy and Geography,
Bulgarian Academy of Sciences,
Akad. G. Bonchev St, Bl. 3, 1113 Sofia, Bulgaria

E-mail: dimos@geophys.bas.bg

Stela Simeonova, National Institute of Geophysics, Geodesy and Geography, Bulgarian Academy of Sciences

Mailing Address:
National Institute of Geophysics, Geodesy and Geography,
Bulgarian Academy of Sciences,
Akad. G. Bonchev St, Bl. 3, 1113 Sofia, Bulgaria

E-mail: ssimeonova@geophys.bas.bg

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Published

31-03-2024

How to Cite

[1]
P. Raykova, D. Solakov, and S. Simeonova, “Temporal Characteristics of the February 6, 2023 MW7.8, Turkey Earthquake Aftershock Sequence”, C. R. Acad. Bulg. Sci. , vol. 77, no. 3, pp. 370–379, Mar. 2024.

Issue

Section

Geophysics