Seismic behaviour of the North Anatolian Fault beneath the Sea of Marmara (NW Turkey): implications for earthquake recurrence times and future seismic hazard

2008 ◽  
Vol 50 (1) ◽  
pp. 45-71 ◽  
Author(s):  
Murat Utkucu ◽  
Zakir Kanbur ◽  
Ömer Alptekin ◽  
Fatih Sünbül
Keyword(s):  
Seismic Hazard ◽  
North Anatolian Fault ◽  
Sea Of Marmara ◽  
Earthquake Recurrence ◽  
Seismic Behaviour ◽  
Recurrence Times ◽  
The North ◽  
Nw Turkey

scholarly journals Microseismicity at the North Anatolian Fault in the Sea of Marmara offshore Istanbul, NW Turkey

2009 ◽  
Vol 114 (B9) ◽  
Author(s):  
Fatih Bulut ◽  
Marco Bohnhoff ◽  
William L. Ellsworth ◽  
Mustafa Aktar ◽  
Georg Dresen
Keyword(s):  
North Anatolian Fault ◽  
Sea Of Marmara ◽  
The North ◽  
Nw Turkey

scholarly journals GONAF – the borehole Geophysical Observatory at the North Anatolian Fault in the eastern Sea of Marmara

2017 ◽  
Vol 22 ◽  
pp. 19-28 ◽  
Author(s):  
Marco Bohnhoff ◽  
Georg Dresen ◽  
Ulubey Ceken ◽  
Filiz Tuba Kadirioglu ◽  
Recai Feyiz Kartal ◽  
...  
Keyword(s):  
Fault Zone ◽  
Historical Seismicity ◽  
North Anatolian Fault ◽  
Sea Of Marmara ◽  
North Anatolian Fault Zone ◽  
Recurrence Times ◽  
Geophysical Observatory ◽  
The North ◽  
Population Center

Abstract. The Marmara section of the North Anatolian Fault Zone (NAFZ) runs under water and is located less than 20 km from the 15-million-person population center of Istanbul in its eastern portion. Based on historical seismicity data, recurrence times forecast an impending magnitude M>7 earthquake for this region. The permanent GONAF (Geophysical Observatory at the North Anatolian Fault) has been installed around this section to help capture the seismic and strain activity preceding, during, and after such an anticipated event.

scholarly journals Active fault segments along the North Anatolian Fault system in the Sea of Marmara: implication for seismic hazard

2021 ◽  
Author(s):  
Luca Gasperini ◽  
Massimiliano Stucchi ◽  
Vincenzo Cedro ◽  
Mustapha Meghraoui ◽  
Gulsen Ucarkus ◽  
...  
Keyword(s):  
High Resolution ◽  
Seismic Hazard ◽  
Seismic Reflection ◽  
Strike Slip ◽  
North Anatolian Fault ◽  
Sediment Supply ◽  
Fault System ◽  
Sea Of Marmara ◽  
Seismic Reflection Data ◽  
The North

AbstractA new analysis of high-resolution multibeam and seismic reflection data, collected during several oceanographic expeditions starting from 1999, allowed us to compile an updated morphotectonic map of the North Anatolian Fault below the Sea of Marmara. We reconstructed kinematics and geometries of individual fault segments, active at the time scale of 10 ka, an interval which includes several earthquake cycles, taking as stratigraphic marker the base of the latest marine transgression. Given the high deformation rates relative to sediment supply, most active tectonic structures have a morphological expression at the seafloor, even in presence of composite fault geometries and/or overprinting due to mass-wasting or turbidite deposits. In the frame of the right-lateral strike-slip domain characterizing the North Anatolian fault system, three types of deformation are observed: almost pure strike-slip faults, oriented mainly E–W; NE/SW-aligned axes of transpressive structures; NW/SE-oriented trans-tensional depressions. Fault segmentation occurs at different scales, but main segments develop along three major right-lateral oversteps, which delimit main fault branches, from east to west: (i) the transtensive Cinarcik segment; (ii) the Central (East and West) segments; and (iii) the westernmost Tekirdag segment. A quantitative morphometric analysis of the shallow deformation patterns observed by seafloor morphology maps and high-resolution seismic reflection profiles along the entire basin allowed to determine nature and cumulative lengths of individual fault segments. These data were used as inputs for empirical relationships, to estimate maximum expected Moment Magnitudes, obtaining values in the range of 6.8–7.4 for the Central, and 6.9–7.1 for the Cinarcik and Tekirdag segments, respectively. We discuss these findings considering analyses of historical catalogues and available paleoseismological studies for the Sea of Marmara region to formulate reliable seismic hazard scenarios.

scholarly journals Monitoring of gas and seismic energy release by multiparametric benthic observatory along the North Anatolian Fault in the Sea of Marmara (NW Turkey)

2013 ◽  
Vol 196 (2) ◽  
pp. 850-866 ◽  
Author(s):  
Davide Embriaco ◽  
Giuditta Marinaro ◽  
Francesco Frugoni ◽  
Stephen Monna ◽  
Giuseppe Etiope ◽  
...  
Keyword(s):  
Energy Release ◽  
Seismic Energy ◽  
North Anatolian Fault ◽  
Sea Of Marmara ◽  
Seismic Energy Release ◽  
The North ◽  
Nw Turkey

scholarly journals Segmentation and Holocene Behavior of the Middle Strand of the North Anatolian Fault (NW Turkey)

2021 ◽  
Author(s):  
Yacine Benjelloun ◽  
Julia De Sigoyer ◽  
Stéphane Garambois ◽  
Julien Carcaillet ◽  
Yann Klinger
Keyword(s):  
North Anatolian Fault ◽  
The North ◽  
Nw Turkey

scholarly journals The North Anatolian fault in the Sea of Marmara

2003 ◽  
Vol 108 (B4) ◽  
Author(s):  
X. Le Pichon ◽  
N. Chamot-Rooke ◽  
C. Rangin ◽  
A. M. C. Sengör
Keyword(s):  
North Anatolian Fault ◽  
Sea Of Marmara ◽  
The North

Locking Behavior of Main Marmara Fault in Western Turkey During Interseismic Period

2020 ◽  
Author(s):  
Zeynep Yılmaz ◽  
Ali Özgün Konca ◽  
Semih Ergintav
Keyword(s):  
3D Structure ◽  
Slip Rate ◽  
Fault Slip ◽  
North Anatolian Fault ◽  
Gps Data ◽  
Strain Accumulation ◽  
Sea Of Marmara ◽  
Western Turkey ◽  
The North ◽  
Fault Slip Rate

<p>The North Anatolian Fault (NAF) produced multiple earthquakes of M>7 throughout the 20th century, while the part of NAF beneath Sea of Marmara did not rupture during this period. Analysis of the Main Marmara Fault's interseismic behavior, the most active branch of the North Anatolian Fault in this region, in terms of locking depth and fault slip rate is critical for evaluating the region's seismic risk with a population of more than 20 million, as it provides information about the seismic moment deficit that may release in a potential future earthquake.</p><p>In this study, we modeled the Main Marmara Fault's interseismic locking with realistic geometry and 3D structure including sedimentary basins, by implementing a 3D finite element approach and using interseismic GPS velocities. We have optimized the fits with GPS data by evaluating cases where each fault segment is constrained by a fault slip rate below a predefined locking depth ranging from 0 to 20 km. Preliminary models reveal that a difference in locking depth is required between the Western Marmara and the eastern end of the Ganos Segment entering the Sea of Marmara. This result, which is consistent with seismicity studies and other previous studies using 1D profiles shows that the strain accumulation under Western Marmara is less and that the locking depths or couplings are not similar in these two segments. For the Princes' Islands Segment, further analysis is required due to complexity in the GPS data. Recent earthquakes along Silivri also indicate that the strain accumulation is complex with most mechanisms showing significant thrust component. We have also calculated various possible strain accumulation patterns and compared the strain rate field around the Main Marmara Fault. Our results show that in most cases the change in the seismicity of each segment is consistent with the interseismic behavior associated with its fault locking.</p><p>(This research has been supported by Boğaziçi University Scientific Research Projects Coordination Unit. Project Number: 15022, 2019)</p>

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