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Bayesian Probabilities Of Earthquake Occurrences In And Around The Marmara Sea (Western Nafz), TurkeyNormal access

Authors: T. Türker and Y. Bayrak
Event name: 9th Congress of the Balkan Geophysical Society
Session: 4.03 Seismic Risk Analysis
Publication date: 05 November 2017
DOI: 10.3997/2214-4609.201702581
Organisations: BGS, EAGE
Language: English
Info: Extended abstract, PDF ( 1.87Mb )
Price: € 20

Summary:
In this study, Bayesian probability method applied using the extreme-value distribution of earthquake occurrences to estimate the earthquake hazard in and around the Marmara Sea, (western NAFZ). Basic parameters (prior estimates) for computing the Bayesian prior estimates of the seismicity were determined as the slip rate, magnitude, seismic moment and earthquake recurrence rate. After that, parameters were updated (posterior) in terms of Bayes’ theorem and historical estimates of seismicity in and around the Marmara Sea. The Sakarya-Düzce (Karadere-Düzce Basins) zone and Tekirdağ-Merkez-Kumburgaz-Çınarcık Basins (Marmara Sea) zone estimated high seismicity in next years. Six different seismogenic source zones in the Marmara Sea were estimated probabilities of exceedance of earthquake with 6.0, 6.5, 7.0, 7.5 and 8.5 upper bound magnitudes. We selected time period of T=5, 20 and 100 years and were determined coefficients of variation (v=0.1, 0.25 and 1.0 values). As a result of this study, The northern branch of NAFZ occurred earthquake in next years. The Sakarya-Düzce and Marmara Sea have determined the most dangerous regions in next 100-year.


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