Abstract
This study compared earthquake location estimation using grid search and manta ray foraging optimization algorithm for synthetic and real earthquakes data from Van, Turkey. Both locating methods worked well, and they achieved similar results. The horizontal coordinates (latitude and longitude) of the earthquake were obtained successfully with both methods, from the inversion of the arrival times calculated from the noisy and noise-free synthetic earthquake data. However, there was some deviation in depth parameter for the noisy data. The location parameters obtained from the inversion of the real earthquake data using grid search and manta ray foraging optimization methods were in accordance with the solutions presented in previous studies. The depth parameters for the Van earthquakes did not fully match those in the previous studies, possibly due to differences in crustal velocity models. The depth parameters obtained for both Van earthquakes using both methods performed in this study are self-consistent at around 24 km. In addition, Disaster and Emergency Management Presidency and German Research Centre seismology centres also reached depth solutions near those in this study. The grid search method has some disadvantages compared with the manta ray foraging method, as it must be applied gradually, and delays reaching a solution. The manta ray foraging method is an easy, fast way to determine the kinematic location of earthquake hypocentres.
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Data availability
Coordinates and other data of seismology stations can be downloaded from https://deprem.afad.gov.tr/stations. The real earthquake data and travel times used in the study can be downloaded from Disaster and Emergency Management Presidency (DEMP) https://deprem.afad.gov.tr/event-detail/277668.
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Acknowledgements
The comments and suggestions raised by associate editor and two anonymous referees improved the early version of the manuscript considerably. The author thanks Dr. Şenol Özyalın from Dokuz Eylul University, Turkey, for his comments and suggestions. The author also thanks Dr. Weiguo Zhao for the MRFO code and thanks Dr. Miroslav Hallo for the GS code being used in this study. The MRFO and GS algorithms were implemented using the MATLAB®, the software for the numerical computation (http://www.mathworks.com/).
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Edited by Prof. Gaetano Festa (ASSOCIATE EDITOR) / Prof. Gabriela Fernández Viejo (CO-EDITOR-IN-CHIEF).
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Tunçel, A. Comparison of earthquake location parameters determined using grid search and manta ray foraging optimization. Acta Geophys. 72, 2581–2596 (2024). https://doi.org/10.1007/s11600-024-01359-7
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DOI: https://doi.org/10.1007/s11600-024-01359-7