24 Ocak 2020 Sivrice-Doğanyol depremi (Mw6.8) öncesi ve sonrası Pütürge Fayı'nın depremselliğinin ve Gutenberg-Richter parametrelerinin mekânsal ve zamansal analizi
24 Ocak 2020 (Mw6.8) Sivrice-Doğanyol depremi öncesi ve sonrası deprem aktivitesinin sismolojik özellikleri 1 Ocak 2018-6 Ağustos 2020 tarihleri arasında incelenmiştir. Bu aktivitenin dış merkez konumlarının mekânsal ve zamansal dağılımları, fay mekanizması çözümleri ve Gutenberg-Richter parametreleri (Mc, a- ve b-değerleri) dikkate değer örüntüler göstermiştir. Mw≥5.0 büyüklüğündeki depremlerin mekanizma çözümleri, Pütürge Fayı'nın kuzeybatıya eğimli ve sol yanal doğrultu atımlı bir fay olduğunu kanıtlamaktadır. 24 Ocak 2020 öncesi Mc değerindeki artışın, ana depremden 28 gün önce, 27 Aralık 2019'da Mw4.9'luk hafif bir sarsıntıyla eş zamanlı başladığı gözlenmiştir. b-değerindeki düşüş eğilimi, 8 Eylül 2019'da ana şoktan 139 gün önce başlamış ve 27 Aralık 2019'da 0.6 değeri ile en düşük seviyeye gerilemiştir. 24 Ocak 2020 Sivrice-Doğanyol depreminden önce Mc değerindeki artışın ve b-değerinin önemli ölçüde azalmasının nedeni, deprem öncesi Pütürge Fayı üzerindeki aktif gerilmenin artması ve fiziksel özelliklerin depremden önceki değişimi ile ilgili olabilir.
Spatial and temporal analysis of seismicity of the Pütürge Fault, and Gutenberg-Richter parameters before and after Sivrice-Doğanyol earthquake (Mw6.8) of January 24, 2020
The seismological characteristics of earthquake activity before and after January 24, 2020 (Mw6.8) Sivrice-Doğanyol earthquake were studied for the period between January 1, 2018 and August 6, 2020. Spatial and temporal distributions of epicenters of this activity, focal mechanism solutions and Gutenberg-Richter parameters (Mc, a- and b-values) show remarkable patterns. Mechanism solutions of Mw≥5.0 magnitude earthquakes prove that the Pütürge Fault is a left-lateral strike-slip fault with a northwest dipping plane. It was observed that the increase in Mc value before January 24, 2020 Sivrice-Doğanyol mainshock started simultaneously with a light earthquake of Mw4.9 on December 27, 2019, 28 days before the main earthquake. The decrease trend in b-value started on September 8, 2019, 139 days before the mainshock, and on December 27, 2019, the b-value decreased to the lowest level of 0.6. The reason for the increase in Mc value and the significant decrease of the b-value before the January 24, 2020 Sivrice-Doğanyol earthquake may be the effect of the increase in the effective stress on the Pütürge Fault before the earthquake and the change in physical process. Similar findings regarding the decrease of the b-value of seismic activity before large and strong earthquakes have been observed and published for many earthquakes in the world. Studies on this subject are ongoing, and b-value can be considered to use as a long or mid-term warning mechanism before a major earthquake in the future.
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