Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault), - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Natural Hazards and Earth System Sciences Année : 2015

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault),

Résumé

In the deep part of the Sea of Marmara (Turkey), the sedimentation developing upon the North Anatolian Fault is strongly influenced by the associated seismic activity, through gravity reworking (fluidized landslides) and tsunamis. Specific layers (homogenites + turbidites, HmTu), representing individual sedimentary events, have been characterized along three giant piston cores retrieved from the Çinarcik and Central (or Orta) basins. Pre-Holocene, nonmarine sediments, were analyzed, representing the last 12–17 kyr BP (before present). For a 2 kyr long interval, 11 events could be precisely correlated on both sides of the Central Basin's southwestern scarp. For each of them, based on the specific depositional process, the thickness difference between the two sites was considered as a direct estimation of the vertical component of a coeval coseismic offset. The homogenite (upper) component accounts for the major part of the thickness difference (ranging from 36 to 144 cm). These offsets were considered as likely representing dominantly vertical throws, along the transtensional southwestern boundary of the inner, pull-apart Central Basin. In terms of natural hazards, further investigations on this local behavior should rather be directed to tsunami genesis.
Fichier principal
Vignette du fichier
nhess-15-247-2015.pdf (4.57 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-01183353 , version 1 (18-11-2020)

Licence

Paternité - Pas de modifications

Identifiants

Citer

C. Beck, C. Campos, K.K. Eriş, M Namik Çağatay, B. Mercier de Lepinay, et al.. Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault),. Natural Hazards and Earth System Sciences, 2015, pp.247-259. ⟨10.5194/nhess-15-247-2015⟩. ⟨hal-01183353⟩
109 Consultations
29 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More