Active fault segments along the North Anatolian Fault system in the Sea of Marmara: implication for seismic hazard
نویسندگان
چکیده
Abstract A new analysis of high-resolution multibeam and seismic reflection data, collected during several oceanographic expeditions starting from 1999, allowed us to compile an updated morphotectonic map the North Anatolian Fault below Sea Marmara. We reconstructed kinematics geometries individual fault segments, active at time scale 10 ka, interval which includes earthquake cycles, taking as stratigraphic marker base latest marine transgression. Given high deformation rates relative sediment supply, most tectonic structures have a morphological expression seafloor, even in presence composite and/or overprinting due mass-wasting or turbidite deposits. In frame right-lateral strike-slip domain characterizing system, three types are observed: almost pure faults, oriented mainly E–W; NE/SW-aligned axes transpressive structures; NW/SE-oriented trans-tensional depressions. segmentation occurs different scales, but main segments develop along major oversteps, delimit branches, east west: (i) transtensive Cinarcik segment; (ii) Central (East West) segments; (iii) westernmost Tekirdag segment. quantitative morphometric shallow patterns observed by seafloor morphology maps profiles entire basin determine nature cumulative lengths segments. These data were used inputs for empirical relationships, estimate maximum expected Moment Magnitudes, obtaining values range 6.8–7.4 Central, 6.9–7.1 respectively. discuss these findings considering analyses historical catalogues available paleoseismological studies Marmara region formulate reliable hazard scenarios.
منابع مشابه
Focal mechanism determinations of earthquakes along the North Anatolian fault, beneath the Sea of Marmara and the Aegean Sea
We determined the centroid moment tensor (CMT) solutions of earthquakes that occurred along the North Anatolian fault (NAF) beneath the Sea of Marmara and the Aegean Sea, using data obtained from Turkey’s broadband seismograph network. The CMT solution of the 2014 Aegean Sea earthquake (Mw 6.9) represents a strike-slip fault, consistent with the geometry of the NAF, and the source-time function...
متن کاملDetection of fault segments based on P–T dihedra analysis along the North Tabriz fault, NW Iran
Detection of fault segments is an essential step for tracking main transverse faults. General observations from field studies as well as attitude measurements can give an overall understanding of the lengths of the segments, but these are not always sufficient to accurately identify and characterize them. In this study, we analyze P–T dihedra variations based on their eigenvalues to detect faul...
متن کاملSystematic analysis of crustal anisotropy along the Karadere–Düzce branch of the North Anatolian fault
S U M M A R Y We perform a systematic analysis of crustal anisotropy along and around the Karadere–Düzce branch of the North Anatolian fault (NAF), which ruptured during the 1999 Mw 7.4 İzmit and Mw 7.1 Düzce earthquakes. A method consisting of an iterative grid search for the best shear wave splitting parameters in sliding time windows is applied to ∼22 000 measurements recorded in the 6-month...
متن کاملA comparison between the Kazerun (Iran) and the North Anatolian (Turkey) fault systems in fault interaction and seismicity migration based on the spatiotemporal analysis of earthquakes
The Kazerun Fault System (KFS) is a right-lateral strike slip fault system in the middle part of the Zagros seismogenic zone in Iran. Historical and instrumental earthquake data catalogs of this fault system show good evidence of fault interactions and seismic migrations. This study provides evidence for the migration of seismicity in the middle part of the Zagros region along the segments of t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Mediterranean geoscience reviews
سال: 2021
ISSN: ['2661-863X', '2661-8648']
DOI: https://doi.org/10.1007/s42990-021-00048-7