In this study, a statistical analysis of regional and time-dependent changes of earthquake activity in Bodrum and its vicinity before the Bodrum-Kos earthquake (Mw 6.6) that occurred on 21 July 2017 was performed and the Gutenberg-Richter b-value change was investigated. The earthquake catalog used in the calculations was taken from Boğaziçi University, Kandilli Observatory and Earthquake Research Institute. This catalog contains 16947 earthquakes with M>2 between 2004 and the time until the Bodrum-Kos earthquake of 21.07.2017. The completeness magnitude for these earthquakes was calculated as 2.6. The b-value was calculated as 0.97 using the maximum probability method. Considering that tectonic earthquakes have bvalues between 0.5-1, it is seen that the b-value obtained by Gutenberg-Richter law for the vicinity of Bodrum in this study is a good fit. In addition, it was observed that b-value took high values in the north of Bodrum before the Bodrum-Kos earthquake occurred. Low values are observed in the southeast of Bodrum. Stress accumulation was correlated with b-values for the region.
meydana gelen 1206 adet deprem verisi derlenmiştir. Hem BDTİM' den hem de TÜBİTAK' tan alınan bu veriler incelenmiştir. Depremlerin doğru bir şekilde yeniden konumlandırılması yapılıp çalışma alanı için sismojenik kuşağın derinlikle değişimi tespit edilmiştir. Çameli Depreminin meydana geldiği fayın geometrisi ve odak derinliğinin dağılımı ortaya konulmuştur. Bunun için deprem çifti farkı yöntemi (hypoDD) kullanılmıştır. HypoDD yönteminin uygulanmasıyla her iki veri gurubu içindeki dağınık deprem konumları daha küçük kümelere daralmıştır. Dikey kesitlerden deprem odak derinliklerinin iyileştirilmesiyle sismojenik kabuğun sınırı net bir şekilde görülmüştür. Çameli depreminin artçı şokların 5 ile 15 km derinlikte meydana geldiği yüzeyde ise depremlerin KB-GD ve KD-GB yönünde çizgisellik oluşturduğu gözlenmiştir.
Çameli (Denizli) Bölgesi Güneybatı Anadolu'da bulunan aktif tektonik bölgelerden biridir. Bu çalışmada Çameli Bölgesi' ndeki aktif deprem zonu, gravite ve manyetik yöntem kullanılarak 2ve 3-boyutlu olarak modellenmiştir. Çalışma kapsamında Maden Tetkik ve Arama Genel Müdürlüğünden alınan gravite ve manyetik verilerine jeofizik analiz yöntemleri uygulanmıştır. Son olarak, elde edilen gravite ve manyetik sonuçlarının birlikte yorumu ile bölgeye ait tektonik izler ortaya konmuş ve deprem oluşumu ile ilişkilendirilmiştir. Bu çalışmada her ne kadar bölgedeki akışkan varlığının deprem oluşumunda önemli bir etken olduğu ortaya çıkarılsa da genel olarak çalışma alanının tektonik geçmişi, kabuktaki ve üst mantodaki malzemelerin litolojisi, akışkan içeriği, madde heterojenitesi gibi tüm fiziksel ve mekanik özelliklerin bir arada deprem oluşumunu tetiklediği sonucuna ulaşılmıştır.
In this study, measurements obtained through the first two profiles from the TÜBİTAK (The Scientific and Technological Research Council of Turkey) project titled "Research of the Crustal Structure of Northwestern Anatolia with Geophysical Methods" from 2007 were used. Magnetotelluric (MT) measurements were taken from 174 sites approximately every 3 km in the region between Zonguldak and Akşehir (Konya). Dimensionality analysis was conducted with the decomposition of the impedance tensor obtained through the measurement data from the two profiles. The relationship between the observed geo-electric behaviors, the geological structure of the area and the MT dimensionality changes were detected. Two-dimensional (2D) and three-dimensional (3D) structures were revealed as a result of the dimensionality analysis obtained through the MT data from the region located between Zonguldak and Akşehir. The dimensionality was observed to be complex in small periods due to the heterogeneous conductive materials close to the surface and 3D structures were observed to be predominant in high periods. Moreover, the dimensionality near the suture zones were observed to be more complex compared to other areas according to the dimensionality analysis results. The structures in the vicinity of the North Anatolian Fault were found out to be N-NE striking. This indicates the accuracy and reliability of the results.
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