North Marmara Trough architecture of basin infill, basement and faults, from PSDM reflection and OBS refraction seismics

Bécel, A.; Laigle, Mireille; Voogd, B. de; Hirn, A.; Taymaz, Tuncay; Yolsal‐Çevikbilen, Seda; Shimamura, Hideki

doi:10.1016/j.tecto.2010.04.004

Cited by 46 publications

(82 citation statements)

References 32 publications

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“…This area comprises low-angle normal faults,that probably have been redistributing crustal stretching since the early stages of basin formation (i.e. 5-3.5 Ma) (Bécel et al, 2010;Grall et al, 2012). However, it is unclear whether these low angle faults are still active, except in the southern Central Basin where there is evidence of present day activity (Bécel et al, 2009(Bécel et al, , 2010.…”

Section: Structural and Seismotectonic Contextmentioning

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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Section: Structural and Seismotectonic Contextmentioning

confidence: 99%

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

et al. 2012

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“…Triangles indicate OBS locations. Thick black line indicates the seismic profile collected in 2001 during the Seismarmara Cruise 28,36 shown in Fig. 5.…”

Section: Introductionmentioning

confidence: 99%

“…The aftershocks were superimposed on the multichannel seismic section collected in 2001, during the Seismarmara cruise 28,36 (see also in ref. 37 , page 160).…”

Section: Introductionmentioning

confidence: 99%

Gas and seismicity within the Istanbul seismic gap

Géli

Henry

Grall

et al. 2018

Sci Rep

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Understanding micro-seismicity is a critical question for earthquake hazard assessment. Since the devastating earthquakes of Izmit and Duzce in 1999, the seismicity along the submerged section of North Anatolian Fault within the Sea of Marmara (comprising the “Istanbul seismic gap”) has been extensively studied in order to infer its mechanical behaviour (creeping vs locked). So far, the seismicity has been interpreted only in terms of being tectonic-driven, although the Main Marmara Fault (MMF) is known to strike across multiple hydrocarbon gas sources. Here, we show that a large number of the aftershocks that followed the M 5.1 earthquake of July, 25th 2011 in the western Sea of Marmara, occurred within a zone of gas overpressuring in the 1.5–5 km depth range, from where pressurized gas is expected to migrate along the MMF, up to the surface sediment layers. Hence, gas-related processes should also be considered for a complete interpretation of the micro-seismicity (~M < 3) within the Istanbul offshore domain.

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“…Crustal thickness ranges from 35 to 40 km along the North Anatolian Fault and shallows to 25-30 km in the Sea of Marmara region based on receiver functions and controlled source studies (Saunders et al, 1998;Sato et al, 2004;Zor et al, 2006;Laigle et al, 2008;Özacar et al, 2008;Bécel et al, 2009Bécel et al, , 2010Vanacore et al, 2013;Karabulut et al, 2013;Sodoudi et al, 2015). The lithosphere-asthenosphere boundary beneath the East Anatolian Accretionary Complex (EAAC) has been observed at 60-80 km depth based on Sreceiver functions (Angus et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Thickness of the lithosphere beneath Turkey and surroundings from S-receiver functions

et al. 2015

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Abstract. We analyze S-receiver functions to investigate variations of lithospheric thickness below the entire region of Turkey and surrounding areas. The teleseismic data used here have been compiled combining all permanent seismic stations which are open to public access. We obtained almost 12 000 S-receiver function traces characterizing the seismic discontinuities between the Moho and the discontinuity at 410 km depth. Common-conversion-point stacks yield wellconstrained images of the Moho and of the lithosphereasthenosphere boundary (LAB). Results from previous studies suggesting shallow LAB depths between 80 and 100 km are confirmed in the entire region outside the subduction zones. We did not observe changes in LAB depths across the North and East Anatolian faults. To the east of Cyprus, we see indications of the Arabian LAB. The African plate is observed down to about 150 km depth subducting to the north and east between the Aegean and Cyprus with a tear at Cyprus. We also observed the discontinuity at 410 km depth and a negative discontinuity above the 410, which might indicate a zone of partial melt above this discontinuity.

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North Marmara Trough architecture of basin infill, basement and faults, from PSDM reflection and OBS refraction seismics

Cited by 46 publications

References 32 publications

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

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

Gas and seismicity within the Istanbul seismic gap

Thickness of the lithosphere beneath Turkey and surroundings from S-receiver functions

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