Micro-séismicité et processus de fond de mer dans la partie ouest de la Mer de Marmara : nouveaux résultats fondés sur l'analyse des données de sismographes et hydrophones sous-marins

Since the devastating earthquakes of 1999, east of Istanbul, the submerged section of the North Anatolian Fault (NAF), in the Sea of Marmara (SoM) has been intensively monitored, mainly using land stations. Still, the micro-seismicity remains poorly understood. In addition, although the connection of the SoM with the hydrocarbon gas system from the Thrace Basin is now well established, along with the presence of widespread gas within the sedimentary layers, the role of gas on seismicity is still not recognized.Here, we have analyzed Ocean Bottom Seismometer (OBS) data from two deployments (April-July 2011 and September-November 2014) in the western SoM. Based on a high-resolution, 3D-velocity model, and on non-linear methods (NonLinLoc), our location results show that a large part of the micro-seismicity occurs at shallow depths ( 4.5) that frequently occur along the western segments of the MMF.In addition, OBSs also record at least two families of short duration ( 4.5 qui se produisent régulièrement le long de la MMF.Par ailleurs, 2 familles de signaux de courte durée (