Moho, crustal architecture and deep deformation under the North Marmara Trough, from the SEISMARMARA Leg 1 offshore–onshore reflection–refraction survey

Bécel, A.; Laigle, Mireille; Voogd, B. de; Hirn, A.; Taymaz, Tuncay; Galvé, A.; Shimamura, Hideki; Murai, Yoshio; Lépine, Jean-Claude; Sapin, M.; Özalaybey, Serdar

doi:10.1016/j.tecto.2008.10.022

Cited by 77 publications

(176 citation statements)

References 28 publications

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“…Paleomagnetic directions in the west Anatolian extensional province are rotated clockwise [Piper et al, 2008], which we attribute to rotations associated with extension. The plate thickness in the east Anatolian contractional province is 40-50 km [Zor, 2008], in the central Anatolian Ova province 36-40 km thinning toward the southern edge [Zor, 2008], and in the west Anatolian extensional province spot thicknesses are generally in the range of 22-30 km [Tirel et al, 2004;Zhu et al, 2005], with a thickness of only 8 km in the Sea of Marmara [Bécel et al, 2009]. We assume that the thickness of the plate in the central Anatolian Ova province is approximately that of the whole region prior to the present tectonic regime (i.e., at least 13 Ma.).…”

Section: Driving Forcesmentioning

confidence: 99%

Recent behavior of the North Anatolian Fault: Insights from an integrated paleoseismological data set

2010

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The North Anatolian Fault (NAF) is a right‐lateral plate boundary fault that arcs across northern Turkey for ∼1500 km. Almost the entire fault progressively ruptured in the 20th century, its cascading style indicating that stress from one fault rupture triggers fault rupture of adjacent segments. Using published paleoseismic investigations, this study integrates all of the existing information about the timing of paleoearthquakes on the NAF. Paleoseismic investigation data are compiled into a database, and for each site a Bayesian, ordering‐constrained age model is constructed in a consistent framework. Spatial variability of recurrence intervals suggests a spatial pattern in the behavior of earthquakes on the NAF that may correspond to the tectonic provinces within the Anatolian plate. In the west, the shear stress associated with the escaping Anatolian plate interplays with the tensile stress associated with the Aegean extensional province. Along this western transtensional section we recognize short recurrence intervals and switching between the furcated fault strands. The central section of the NAF is translational with little influence of fault‐normal stresses from other tectonic sources. This section tends to rupture in unison or close succession. The eastern section of the NAF is transpressional due to the compressional fault‐normal stress associated with the indenting Arabian plate. Along this section the recurrence intervals are bimodal, which we attribute to variable normal stress, although there are other possible causes.

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Section: Driving Forcesmentioning

confidence: 99%

Recent behavior of the North Anatolian Fault: Insights from an integrated paleoseismological data set

2010

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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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“…1b). Those sediments are cut by north and south dipping faults with significant normal component of slip, as observed in high-resolution bathymetric maps Armijo et al, 2002;, deep-penetration seismic reflection and refraction data [Wong et al, 1995;Parke et al 1999;Carton et al, 2007;Laigle et al, 2008;Bécel et al, 2009; and 2-D and 3-D high resolution multichannel seismic data [Grall et al, 2012;Kurt et al, 2013]. At odds with the evidence for structural complexity and fault segmentation which appear to be fundamental features of the pull-apart system, Imren et al [2001; [2003] and Şengör et al [2005], among others, have alternatively interpreted the Marmara pull-apart system as a trough resulting mainly from the Western Anatolia N-S extensional regime during the middle Miocene.…”

Section: Geological Settingmentioning

confidence: 90%

Crustal Strain in the Marmara Pull‐Apart Region Associated With the Propagation Process of the North Anatolian Fault

et al. 2018

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Key Points:• Structural map and geological cross-section of the Ganos-Gelibolu fold system in the Dardanelles region.• Timing, amount of shortening associated to the propagation of the North Anatolian Fault deduced from mapping and critical revision of the stratigraphy.• Reconstruction of the westward propagation of the NAF in the Dardanelles region. AbstractPropagation processes of plate-scale faults through continental lithosphere are poorly documented. The North Anatolian fault (NAF) is a continental right-lateral transform with striking evidence for propagation processes in the Marmara Sea pull-apart region. Earlier work [Armijo et al., 1999] suggests that in the Dardanelles, where the principal, northern branch of that fault (NNAF) enters into the Aegean: (1) a fold-thrust system has progressively developed above the NNAF fault tip, at the WSW corner of the Marmara Sea pull-apart. The main anticline formed there was sheared and its SW half laterally offset by ~70 km to the SW; (2) the timing of structure development appears correlated with sea-level changes associated with the Messinian Salinity Crisis (MSC). Our new description of the Dardanelles (or Ganos-Gelibolu) fold-thrust system is based on structural mapping, field observations and calcareous nannoplankton analyses to date key sedimentary units. Our results provide tight constraints on the main pulse of folding associated with propagation of the tip of the NNAF: it took place in the late Miocene to earliest Pliocene (5.60 to 5.04 Ma), before deposition of undeformed Pliocene marine sediments. The folding is mostly coeval with the MSC and accommodated several kilometers of shortening at the fault tip. After full propagation of the NNAF up to the surface, the folded structure was sheared and right-laterally offset, with an average 14 mm/yr of slip-rate during the past ~5 Myrs. A reconstruction of tectonic evolution suggests a flower structure nucleating and taking root at the tip of the fault.

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Moho, crustal architecture and deep deformation under the North Marmara Trough, from the SEISMARMARA Leg 1 offshore–onshore reflection–refraction survey

Cited by 77 publications

References 28 publications

Recent behavior of the North Anatolian Fault: Insights from an integrated paleoseismological data set

Recent behavior of the North Anatolian Fault: Insights from an integrated paleoseismological data set

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

Crustal Strain in the Marmara Pull‐Apart Region Associated With the Propagation Process of the North Anatolian Fault

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