Sea-Bottom Observations from the Western Escarpment of the Sea of Marmara

Tary, Jean Baptiste; Géli, Louis; Henry, Pierre; Natal’in, Boris A.; Gasperini, Luca; Comoglu, Mustafa; Çağatay, N.; Bardainne, T.

doi:10.1785/0120100014

Cited by 20 publications

(24 citation statements)

References 29 publications

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“…We therefore tested the 1‐D initial velocity models of Tary et al . [], Karabulut et al . [], and Yamamoto et al .…”

Section: Results and Margins Of Errormentioning

confidence: 99%

“…To investigate the potential for future earthquakes beneath the Marmara Sea [e.g., Bohnhoff et al ., ; Murru et al ., ], a better understanding of the fault geometry is needed so that areas of strong coupling can be identified. Several ocean bottom seismograph (OBS) data sets have been used to attempt to obtain precise hypocenters to address these questions [ Sato et al ., ; Tary et al ., ; Cros and Géli , ; Yamamoto et al ., ]. However, the observation periods and/or spatial extent of observation area of these studies were not extensive enough to interpret the fault geometry beneath whole MMF.…”

Section: Introductionmentioning

confidence: 98%

“…However, their data included many earthquakes for which hypocenters were determined without using OBS data (because their temporal dense offshore observation periods of 1 to 3 months were too short, and their enabled cable‐type OBSs were sparse (~40 km intervals) and limited the functioned duration of 1 to 2 years); thus, their conclusions may not apply to the whole of the Marmara Sea. It is therefore possible that earthquakes have occurred within the lower crust at depths of 20 km or deeper, as suggested by other OBS observations [ Sato et al ., ; Tary et al ., ; Cros and Géli , ; Yamamoto et al ., ].…”

Section: Introductionmentioning

confidence: 98%

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Geometry and segmentation of the North Anatolian Fault beneath the Marmara Sea, Turkey, deduced from long‐term ocean bottom seismographic observations

et al. 2017

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Both the geometry and the depth of the seismogenic zone of the North Anatolian Fault under the Marmara Sea (the Main Marmara Fault (MMF)) are poorly understood, in part because of the fault's undersea location. We recorded 10 months of microseismic data with a dense array of ocean bottom seismographs and then applied double‐difference relocation and 3‐D tomographic modeling to obtain precise hypocenters on the MMF beneath the central and western Marmara Sea. The hypocenters show distinct lateral changes along the MMF: (1) both the upper and lower crust beneath the Western High are seismically active and the maximum focal depth reaches 26 km; (2) seismic events are confined to the upper crust beneath the region extending from the eastern part of the Central Basin to the Kumburgaz Basin; and (3) the magnitude and direction of dip of the main fault change under the Central Basin, where there is also an abrupt change in the depth of the lower limit of the seismogenic zone. We attribute this change to a segment boundary of the MMF. Our data show that the upper limit of the seismogenic zone corresponds to sedimentary basement. We also identified several seismically inactive regions within the upper crust along the MMF; their spatial extent beneath the Kumburgaz Basin is greater than beneath the Western High. From the comparison with seafloor extensometer data, we consider that these regions might indicate zones of strong coupling that are accumulating stress for release during future large earthquakes.

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“…We therefore tested the 1‐D initial velocity models of Tary et al . [], Karabulut et al . [], and Yamamoto et al .…”

Section: Results and Margins Of Errormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Geometry and segmentation of the North Anatolian Fault beneath the Marmara Sea, Turkey, deduced from long‐term ocean bottom seismographic observations

et al. 2017

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“…Micro-seismic activity is found on the Ganos fault, and along both the southern and NE margins of the Tekirdağ Basin (Örgülü, 2011;Tary et al, 2011). The instrumental seismicity data show micro-seismicity beneath the Ganos Complex area, for the time-period between 1986 and 1996 (Gürbüz et al, 2000(Sato et al, 2004Örgülü, 2011), 2002(Örgülü, 2011.…”

Section: The Ganos Landslide Complexmentioning

confidence: 99%

Distribution, morphology and triggers of submarine mass wasting in the Sea of Marmara

et al. 2012

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An overview is given of mass wasting features along the slopes of the Sea of Marmara, Turkey, based on new data and previously published information. The Sea of Marmara is characterized by active tectonics along the North Anatolian Fault and by eustatic sea level changes controlling the connections both to the Mediterranean and Black Sea (i.e. lacustrine and marine conditions during sea-level low and high stands, respectively). High resolution bathymetric data, subsurface echo-sounder and seismic reflection profiling, seafloor visual observations, as well as stratigraphic analysis of sediment cores have been used to identify, map and date submarine slope failures and mass wasting deposits. Gravity mass movements are widespread on the steep slopes of the Sea of Marmara, and range from small scale slope failures, mainly located within the canyons, to wider unstable areas (20 to 80 km 2 ). The largest mass wasting features, i.e. the Tuzla, Ganos and Yalova complexes, have been analyzed in connection with crustal deformation. These gravitational gliding masses are probably induced by the transtensional deformation within the crust. Moreover, age determination of landslides and debris flows indicate that they were more frequent during the last transgressive phase, when the rate of terrigenous sediments supplied by the canyons to the deep basin was higher. We discuss these results taking into account activity, pre-conditioning and trigger mechanisms for slope instability with respect to tectonics and paleo-environmental changes induced by sea-level oscillations.

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“…Instruments were deployed on the seafloor for durations from one month to one year. Some clusters of microseismic activity appeared to be spatially correlated with fluid migration through the crust (Tary et al, 2011). The flow-meters (Tryon et al, 2011) as well as the physical and chemical sensors, deployed with SN-4 system, measured temporal variations related to episodic fluid emissions through the seafloor.…”

Section: Results and Next Steps For The Mamara Observatorymentioning

confidence: 99%

Open-Sea Observatories: A New Technology to Bring the Pulse of the Sea to Human Awareness

Puillat¹,

Lantéri²,

Drogou³

et al. 2012

Oceanography

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Sea-Bottom Observations from the Western Escarpment of the Sea of Marmara

Cited by 20 publications

References 29 publications

Geometry and segmentation of the North Anatolian Fault beneath the Marmara Sea, Turkey, deduced from long‐term ocean bottom seismographic observations

Geometry and segmentation of the North Anatolian Fault beneath the Marmara Sea, Turkey, deduced from long‐term ocean bottom seismographic observations

Distribution, morphology and triggers of submarine mass wasting in the Sea of Marmara

Open-Sea Observatories: A New Technology to Bring the Pulse of the Sea to Human Awareness

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