Integrating Multi-Resolution Seismic Reflection Data to Investigate Active Fault Geometry, Segmentation, and Evolution in Erdek Bay, Southwestern Marmara Sea
Applied Sciences, cilt.16, sa.21, ss.10871-10872, 2026 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 16 Sayı: 21
- Basım Tarihi: 2026
- Doi Numarası: 10.3390/app162110871
- Dergi Adı: Applied Sciences
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
- Sayfa Sayıları: ss.10871-10872
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
Erdek Bay, in the south western Sea of Marmara, lies along the Central Branch of the North Anatolian Fault system (NAF-C). This study integrates very high-resolution CHIRP, sparker, and high-resolution multi-channel seismic reflection (MCS) data with complementary resolution and penetration to investigate fault geometry, segmentation, and evolution. Seismic stratigraphic correlation with a well-tied regional section and time-structure mapping of four interpreted horizons (acoustic basement, base Pliocene, near-base Quaternary and ~9 ka) enable faults to be traced from the seafloor to the acoustic basement, and the results are summarized in a three-dimensional conceptual model. MCS data image basement-offsetting faults to ~1.3 s two-way travel time. Vertical separation generally decreases toward younger horizons and varies irregularly along strike, consistent with cumulative deformation and fault segmentation. Steep fault geometries, irregular along-strike variations in vertical separation, throw-direction reversal and regional tectonic constraints are compatible with possible oblique-slip components, although individual fault kinematics remain uncertain. Seismic-stratigraphic relationships suggest Pliocene fault activity potentially associated with development of the modern NAF-C tectonic regime; CHIRP and Sparker data document Holocene deformation along selected strands. Scenario-based magnitude estimates for four segments interpreted to offset H1 range from Mw 5.80 to 6.23 under individual-segment rupture assumptions. This multi-resolution approach improves characterization of distributed offshore fault systems.