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Abstract. Coulomb stress changes before and after the 23 October 2011 Van, eastern Turkey, earthquake have been analysed using available data related to the background and the aftershock seismicity and the source faults. The coseismic stress changes of the background seismicity had slightly promoted stress over the rupture plane of the 2011 Van earthquake, while it yielded a stress shadow over the Gürpı nar Fault which has been argued to have produced the 7 April 1646 Van earthquake. The stress shadow over the Gürp\\i nar fault has become more pronounced following the occurrence of the 2011 Van earthquake, meaning that the repetition of the 1646 Van earthquake has been further suppressed. Spatial distribution and source mechanisms of the 2011 Van earthquake's aftershocks have been utilised to define four clusters with regard to their relative location to the mainshock rupture. In addition, the aftershock sequence covers a much broader area toward the northeast. Correlations between the observed spatial patterns of the aftershocks and the coseismic Coulomb stress changes caused by the mainshock are determined by calculating the stress changes over both optimally oriented and specified fault planes. It is shown here that there is an apparent correlation between the mainshock stress changes and the observed spatial pattern of the aftershock occurrence, demonstrating the usefulness of the stress maps in constraining the likely locations of the upcoming aftershocks and mitigating earthquake hazard.

The deformation of the North Aegean Sea is mainly controlled by the westernmost segments of North Anatolian Fault System. On 8 January 2013, a moderate earthquake (Mw = 5.7) occurred in the North Aegean Sea. A series of aftershocks were occurred within four months following the mainshock, which have magnitudes varying from Ml = 0.9 to 5.0. We have obtained a total of 23 earthquake moment tensor solutions that belong to the 2013 earthquake sequence. The source of this earthquake sequence is a N75°E trending pure dextral strike-slip fault. The temporal and spatial distribution of the earthquakes indicate that the rupture unilaterally propagates from SW to NE. The stress tensor analysis shows that the direction of the regional compressive stress is WNW-ESE. The 1968 Aghios earthquake (Ms = 7.3) and the 2013 North Aegean Sea earthquake sequences indicate that the regional stress has been transferred from SW to NE in this region. The 1672 Bozcaada earthquake (M = 7.0) had been occurred to the north-east of the 2013 earthquake sequence. The elapsed time (342 year) and the regional stress transfer point out that the 1672 earthquake segment is probably a seismic gap and it is a potential earthquake hazard for this region.

This study aimed to investigate the leisure involvement level of individuals 40 years and over according to various variables. The study sample consisted of 106 volunteers aged 40 years and over in Hendek district of Sakarya city. As a data collection tool "leisure involvement scale" which developed by Kyle et al. (2007) and adapted to Turkish by Gürbüz et al. (2015), and personal information form were used. SPSS statistic program was used to analyze the data. The histograms, Skewness, and Kurtosis values (between -1 and +1) were checked to ensure normal distribution of the data. Therefore, parametric tests, independent sample t tests, and one-way ANOVA tests were used. To determine the significant differences between the groups, the Tukey test used. According to the findings of the study, between the gender variable and social relationship level, between the long-term accommodation place variable and attractiveness, between giving the importance and social relationship, between daily leisure time and giving importance and social relationship level, difficulty in finding free time and attractiveness, between the variables giving importance, social relationship and identification and doing sport statistically meaningful result found with the attractiveness dimension. As a result, it was found that the social relationships of females were higher in

ÖZ 23 Ekim 2011 Van depreminin geniş bant uzak-alan cisim dalga şekillerinin sonlu-fay modellemesi deprem kırılmasının ters faylanma olduğunu ve tek taraflı olarak GB'ya yayıldığını göstermiştir. Kırılma 5 km altında kısıtlı kalmış, yaklaşık 5.5 m en büyük kayma ile 25 x 16 km'lik bir fay alanını örtmüş ve yaklaşık 11 sn sürmüştür. Sonlu-fay modeli için hesaplanan sismik moment 4.6 x10 19 Nm (Mw=7.1) olup çoğunluğu kırılma başlangıcından sonraki 5-9 sn zaman aralığında serbestlenmiştir. Sonlu-fay analizi en büyük kayma alanı için 3 sn'lik bir yükselim zamanı önermektedir. 2011 Van depreminin 3 büyük artçı depreminin uzak-alan nokta kaynak modellemesi bu artçı depremlerin hem ters hem de doğrultu atımlı faylanma mekanizmalarına sahip olduğunu göstermiş, 9 Kasım 2011 artçı depreminin ana şoktan farklı bir fay üzerinde meydana geldiğini doğrulamıştır. 2011 Van depremi artçı depremlerini içererek ve içermeden yapılan Van Gölü bölgesindeki deprem odak mekanizmalarının gerilme tensör analizleri bölgede gerilme rejiminin doğrultu-atımlı olduğunu ve sıkışma gerilmesi ekseninin yaklaşık K-G doğrultusunda uzandığını belirtmiştir. 2011 Van depremi Doğu Anadolu'da aletsel dönemde hemen hemen tamamıyla ters faylanmalı olarak meydana gelmiş ilk büyük deprem olup bölgede yaygın olarak gözlenen doğrultu atımlı faylanmaların yanısıra ters faylanmalarında meydana gelebileceğini kanıtlamıştır.

The Southern Marmara Region is an active deformation area, which is a transition zone between the strike-slip tectonics manifested by the North Anatolian Fault (1944, 1953, 1964) indicate that the ruptures unilaterally propagate from SW to NE. The 1855 earthquake had been occurred to the east of Manyas Lake. The elapsed time (160 year) and regional stress transfer suggest that the segments to the east of Manyas Lake form a probable seismic gap and this area has a high earthquake risk.

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