Assessment of crustal thinning and tectonic stress distribution of Gulbahce fault zone and its surroundings (Izmir, West Turkiye) using gravity and magnetic anomalies

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PAMUKÇU O., ÇIRMIK A., DOĞRU F., Unlu E., Malalici B. C.

BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION, sa.169, ss.105-119, 2022 (ESCI) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Basım Tarihi: 2022
  • Doi Numarası: 10.19111/bulletinofmre.1029265
  • Dergi Adı: BULLETIN OF THE MINERAL RESEARCH AND EXPLORATION
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus, Directory of Open Access Journals, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.105-119
  • Anahtar Kelimeler: Bouguer Gravity Anomaly, Gülbahçe Fault Zone (GFZ), Magnetic, Microgravity, Parasnis Method
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Gulbahce Fault Zone (GFZ) is a significant tectonic structure and seismic source for Izmir city and its surroundings. The major earthquakes occurred at the surroundings of GFZ are 2005 Seferihisar, 2020 Samos Island-Aegean Sea and 2021 Seferihisar earthquakes. In this study, the crustal thinning and tectonic stress distribution of GFZ and its surroundings were analyzed by using the new gravity and magnetic data. The correspondence analysis was applied by appraising together the magnetic and free-air anomaly data. Moreover, the average density of the subsurface structure was calculated by applying the Parasnis method. The deviatoric stress calculation was executed and the change of the physical properties that controls the gravity and magnetic anomaly of the crustal structure of the GFZ and its surroundings from north to south was investigated. Therefore, the average density values, which were obtained from gravity anomalies, were computed as 2.59 gr / cm(3) in the north of the study region and it decreased to 2.06, 1.8 and 1.49 gr / cm(3) towards to the south. The free-air gravity anomaly values were between 0-70 mGal and the magnetic anomalies were between -450-150 nT. The deviatoric stress values were between -0.2-0.1 MPa.