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Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri

Year 2021, , 167 - 192, 20.12.2021
https://doi.org/10.46464/tdad.1014479

Abstract

Bu çalışmada Ganos Fayı üzerinde kurulu MONGAN-1 ve MONGAN-2 sismik ağları ile kaydedilen mikro depremlerin moment tensör ve gerilme analizleri yapılmıştır. MONGAN-1 sismik ağı yaklaşık 10 km2’lik lokal bir alanda kurulu 40 adet kısa periyot deprem istasyonundan oluşur ve kullanılan depremlerin genel özelliği ağ dışı depremler olmalarıdır. Bu nedenle dar bir azimut aralığında adeta bir nokta alıcı gibi davranan sismik ağa ait kayıtlar kullanılarak azimutal dağılımın çözümler üzerindeki etkisi araştırılmıştır. Seçilen depremler Tekirdağ Baseni ile Ganos Fayı arasında kalan bölgede, Ekim 2017-Haziran 2020 tarihleri arasında meydana gelen, büyüklüğü 1.5≤Mw≤3.7 arasında değişen 61 adet mikro depremden oluşur. Depremlerden büyüklüğü 2.8≤ Mw≤3.7 arasında değişen 10 tanesinin geniş bant ulusal ağ kayıtları kullanılarak hem moment tensör hem de P dalgası ilk hareket yönlerinden odak mekanizmaları belirlenerek MONGAN ağı çözümleri ile karşılaştırılmıştır. Elde edilen odak mekanizmalarının doğrultu, eğim ve atım açılarında küçük farklar olsa da genellikle her deprem için elde edilen üç odak mekanizmasının da birbirleriyle uyumlu olduğu görülmüştür. Bölgedeki hız yapısını yüksek çözünürlüklü olarak temsil eden bir kabuk modeli ile azimutal dağılımın iyi olmadığı istasyon kayıtlarıyla mikro depremlerin moment tensör analizlerinin başarıyla uygulanabileceği görülmüştür. Gerilme analizi sonucunda σ1, σ2 ve σ3 asal gerilme eksenlerinin konumu sırasıyla 277.2/42.8, 87.7/46.7 ve 182.9/4.7 (azimut/dalım) olarak bulunmuştur. Bölgedeki gerilme oranı ise 0.60 olarak hesaplanmıştır.

Supporting Institution

TÜBİTAK

Project Number

118R019

Thanks

Bu çalışmada, TÜBİTAK tarafından desteklenen 118R019 numaralı “Ganos Fayı Üzerindeki 1912 Depremi Kırığının Güncel Etkinliğinin Görüntülenmesi” başlıklı proje kapsamında kurulan MONGAN sismik ağları tarafından kaydedilen deprem verileri kullanılmıştır. Yazarlar, verileri paylaştıkları için projede görev alan; Marco Bohnhoff, Hakan Alp, Stephan Bentz, Ali Pınar, Fatih Alver, Ömer Kılıçarslan ve Burçak Görgün’e teşekkür ederler. Şekillerdeki haritalar GMT programı (Wessel ve diğ. 2013) kullanılarak hazırlanmıştır.

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Moment Tensor Analysis and Stress Analysis of Microearthquakes Occurred Between Ganos Fault and Tekirdag Basin

Year 2021, , 167 - 192, 20.12.2021
https://doi.org/10.46464/tdad.1014479

Abstract

In this study, moment tensor analyses of microearthquakes recorded with the MONGAN-1 and MONGAN-2 seismic networks deployed on the Ganos Fault are done. The MONGAN-1 seismic network consists of 40 short-period stations located in a local area of approximately 10 km2, and the general feature of the earthquakes used is that they are out of the network. The effect of the azimuthal coverage of the seismic network, behaving like a point receiver covering a narrow azimuthal range for moment tensor analysis of microearthquakes, is investigated. For this purpose, 61 microearthquakes with magnitudes varying between 1.5≤Mw≤3.7, occurred between October 2017 and June 2020 in the region between Tekirdağ Basin and Ganos Fault, are analyzed. Broadband national network records of 10 earthquakes with magnitudes ranging between 2.8≤Mw≤3.7 are used to determine the focal mechanisms using both moment tensor inversion and P wave first motion polarities techniques and then are compared with the MONGAN network’s solutions. Although there are minor differences in the strike, dip and rake angles of the focal mechanisms obtained, it is observed that the three focal mechanism analysis results are generally compatible with each other. Although the azimuthal coverage of the seismic network is not good, moment tensor inversions of the microearthquakes can be successfully applied with an accurate crustal model. As a result of the stress analysis, the principal stress axes orientations of σ1, σ2 and σ3 are obtained as 277.2/42.8, 87.7/46.7 and 182.9/4.7 (azimuth/dip), respectively. The stress ratio in the region is calculated as 0.60.

Project Number

118R019

References

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  • Altunel E., Meghraou, M., Akyuz H.S., Dikbas A., 2004. Characteristics of the 1912 co-seismic rupture along the North Anatolian Fault Zone (Turkey): implications for the expected Marmara earthquake, Terra Nova (16), 198-204.
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  • Ambraseys N.N., Jackson J.A., 2000. Seismicity of the Sea of Marmara (Turkey) since 1500, Erişim adresi: https://academic.oup.com/gji/article/141/3/F1/613019
  • Ardeleanu L., Radulian M., Sileny J., Panza G.F., 2005. Source parameters of weak crustal earthquakes of the Vrancea region from short-period waveform inversion, Pure and Applied Geophysics 162(3), 495-513.
  • Armijo R., Meyer B., Hubert A., Barka A., 1999. Westward propagation of the North Anatolian fault into the northern Aegean: Timing and kinematic, Geology 27(3), 267-270.
  • Armijo R., Pondard N., Meyer B., Ucarkus G., Lepinay B.M., Malavieille J., Dominguez S., Gustcher M., Schmidt S., Beck C., Cagatay N., Cakir Z., Imren C., Eris K., Natalin B., Ozalaybey S., Tolun L., Lefevre I., Seeber L., Gasperini L., Rangin C., Emre O. and Sarikavak K., 2005. Submarine fault scarps in the Sea of Marmara pull-apart (North Anatolian Fault): Implications for seismic hazard in İstanbul, Geochemistry Geophysics Geosystems 6 Q06009, doi:10.1029/2004GC000896.
  • Barros L.V., Carvalho J., Ferreira V.M., Albuquerque D.F., Von Huelsen M.G., Caixeta D.F., Fontenele D.P., 2014. Determination of source seismic parameters of micro-earthquakes with epicenter in the south of Minas Gerais State-Brazil, Sociedade Brasileira de Geofísica Este 1-3.
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  • Benetatos C., Malek J., Verga F., 2013. Moment tensor inversion for two micro-earthquakes occurring inside the Haje gas storage facilities, Czech Republic, Journal of Seismology 17(2), 557-577.
  • Bouchon M., 1981. A simple method to calculate Green’s functions for elastic layered media, Bulletin of the Seismological Society of America 71(4), 959-971.
  • Carvalho J., Barros L.V., Zahradnik J., 2016. Focal mechanisms and moment magnitudes of micro-earthquakes in central Brazil by waveform inversion with quality assessment and inference of the local stress field, Journal of South American Earth Sciences 71, 333-343.
  • Chan A., Zoback M., 2007. The Role of Hydrocarbon Production on Land Subsidence and Fault Reactivation in the Louisiana Coastal Zone, Journal of Coastal Research 23, 771-786.
  • Christova C., Tsapanos T., 2000. Depth distribution of stresses in the Hokkaido Wadati-Benioff zone as deduced by inversion of earthquake focal mechanisms, Journal of Geodynamics 30(5), 557-573.
  • Coskun Z., 2021. Deformation Styles and Rates Along the North Anatolian Fault Zone in the Sea of Marmara Based on Onshore-Offshore Seismic, Geodetic and Geologic Data, PhD Thesis, Boğaziçi University, Kandilli Observatory and Earthquake Research Institute, Graduate Program in Earthquake Engineering, İstanbul,162 p.
  • Delvaux D., Barth A., 2010. African stress pattern from formal inversion of focal mechanism data, Tectonophysics 482 (1-4), 105-128.
  • Emre O., Duman T.Y., Ozalp S., Elmaci H., Olgun S., Saroglu F., 2013. 1/1.250.000 scaled Turkey active fault map, General Directorate of Mineral Research and Exploration Special Publication. Erişim adresi: http://www.mta.gov.tr
  • Emre O., Duman T.Y., Ozalp S., Saroglu F., Olgun S., Elmac, H., Çan T., 2018. Active fault database of Turkey, Bulletin of Earthquake Engineering 16 (8), 3229-3275.
  • Gurbuz C., Aktar M., Eyidogan H., Cisternas A., Haessler H., Barka A., Ergin M., Turkelli N., Polat O., Ucer B., Kuleli S., Baris¸ S., Kaypak B., Bekler T., Zor E., Bicmen F., Yoruk A., 2000. The seismotectonics of the Marmara Region (Turkey): Results from a microseismic experiment, Tectonophysics 316, 1-17.
  • Fojtikova L., Vavrycuk V., Cipciar A., Madaras J., 2010. Focal mechanisms of micro-earthquakes in the Dobrá Voda seismoactive area in the Malé Karpaty Mts. (Little Carpathians), Slovakia, Tectonophysics 492(1-4), 213-229.
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There are 71 citations in total.

Details

Primary Language Turkish
Subjects Geological Sciences and Engineering (Other), Geology (Other)
Journal Section Articles
Authors

Burçin Didem Tamtaş 0000-0001-7713-5067

Esref Yalcınkaya 0000-0003-0593-0656

Ethem Görgün This is me 0000-0002-4563-3296

Project Number 118R019
Publication Date December 20, 2021
Submission Date October 25, 2021
Published in Issue Year 2021

Cite

APA Tamtaş, B. D., Yalcınkaya, E., & Görgün, E. (2021). Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri. Türk Deprem Araştırma Dergisi, 3(2), 167-192. https://doi.org/10.46464/tdad.1014479
AMA Tamtaş BD, Yalcınkaya E, Görgün E. Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri. TDAD. December 2021;3(2):167-192. doi:10.46464/tdad.1014479
Chicago Tamtaş, Burçin Didem, Esref Yalcınkaya, and Ethem Görgün. “Ganos Fayı Ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör Ve Gerilme Analizleri”. Türk Deprem Araştırma Dergisi 3, no. 2 (December 2021): 167-92. https://doi.org/10.46464/tdad.1014479.
EndNote Tamtaş BD, Yalcınkaya E, Görgün E (December 1, 2021) Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri. Türk Deprem Araştırma Dergisi 3 2 167–192.
IEEE B. D. Tamtaş, E. Yalcınkaya, and E. Görgün, “Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri”, TDAD, vol. 3, no. 2, pp. 167–192, 2021, doi: 10.46464/tdad.1014479.
ISNAD Tamtaş, Burçin Didem et al. “Ganos Fayı Ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör Ve Gerilme Analizleri”. Türk Deprem Araştırma Dergisi 3/2 (December 2021), 167-192. https://doi.org/10.46464/tdad.1014479.
JAMA Tamtaş BD, Yalcınkaya E, Görgün E. Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri. TDAD. 2021;3:167–192.
MLA Tamtaş, Burçin Didem et al. “Ganos Fayı Ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör Ve Gerilme Analizleri”. Türk Deprem Araştırma Dergisi, vol. 3, no. 2, 2021, pp. 167-92, doi:10.46464/tdad.1014479.
Vancouver Tamtaş BD, Yalcınkaya E, Görgün E. Ganos Fayı ile Tekirdağ Baseni Arasında Meydana Gelen Mikro Depremlerin Moment Tensör ve Gerilme Analizleri. TDAD. 2021;3(2):167-92.

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