Rupture characteristics of the A.D. 1912 Mürefte (Ganos) earthquake segment of the North Anatolian fault (western Turkey)

Aksoy, Murat Ersen; Meghraoui, Mustapha; Vallée, Martin; Çakır, Ziyadin

doi:10.1130/g31447.1

Cited by 61 publications

(65 citation statements)

References 20 publications

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“…To the east, ruptures have propagated toward Istanbul since 1939, with a last event of magnitude 7.4 in Izmit in 1999 [e.g., Barka et al, 2002]. To the west, the NAF failed in 1912 in Ganos (M7.4 event) [e.g., Aksoy et al, 2010]. In the central Marmara Sea, the 70 km long Istanbul-Silivri segment (ISS) of the NAF has had no significant seismic events since at least 1766 and perhaps as far back as 989 [Ambraseys, 2002].…”

Section: Introductionmentioning

confidence: 99%

No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging

Sakic

Piete

Ballu

et al. 2016

Geophysical Research Letters

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The submarine Istanbul‐Silivri fault segment, within 15 km of Istanbul, is the only portion of the North Anatolian Fault that has not ruptured in the last 250 years. We report first results of a seafloor acoustic ranging experiment to quantify current horizontal deformation along this segment and assess whether the segment is creeping aseismically or accumulating stress to be released in a future event. Ten transponders were installed to monitor length variations along 15 baselines. A joint least squares inversion for across‐fault baseline changes, accounting for sound speed drift at each transponder, precludes fault displacement rates larger than a few millimeters per year during the 6 month observation period. Forward modeling shows that the data better fit a locked state or a very moderate surface creep—less than 6 mm/yr compared to a far‐field slip rate of over 20 mm/yr—suggesting that the fault segment is currently accumulating stress.

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Section: Introductionmentioning

confidence: 99%

No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging

Sakic

Piete

Ballu

et al. 2016

Geophysical Research Letters

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“…Ambraseys and Jackson (2000) suggested a 37 km long co-seismic rupture for this large second shock. Aksoy et al (2010) used the duration of the recorded waveforms to estimate the rupture lengths of 1912 events: assuming the rupture width is 15-20 km, estimated values were 130±15 km and 110±30 km for the 9 August and 13 September events, respectively. According to Aksoy et al (2010), co-seismic surface ruptures were visible along the 45 km onshore section of this segment.…”

Section: Ganos/saros Rupture Systemmentioning

confidence: 99%

“…Aksoy et al (2010) used the duration of the recorded waveforms to estimate the rupture lengths of 1912 events: assuming the rupture width is 15-20 km, estimated values were 130±15 km and 110±30 km for the 9 August and 13 September events, respectively. According to Aksoy et al (2010), co-seismic surface ruptures were visible along the 45 km onshore section of this segment. Supporting the estimations based on waveforms using aerial photographs, satellite imagery, digital elevation models, bathymetry, and field measurements, Aksoy et al (2010) proposed 120 ± 30 km long fault rupture for the 9 August 1912 event.…”

Section: Ganos/saros Rupture Systemmentioning

confidence: 99%

“…Magnitudes of this earthquake were estimated from historical catalogs and field observations as M s = 7.3±0.3 (by Ambraseys and Jackson, 2000) and M w = 7.4 (by Altunel et al, 2004), respectively (Aksoy et al, 2010). A second large event occurred on 13 September 1912 (M s = 6.8 ± 0.35 and the estimated seismic moment was 2.19 × 10 19 Nm as given in Ambraseys and Jackson, 2000).…”

Section: Ganos/saros Rupture Systemmentioning

confidence: 99%

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Planar seismic source characterization models developed for probabilistic seismic hazard assessment of Istanbul

Gülerce

Soyman

Güner

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. This contribution provides an updated planar seismic source characterization (SSC) model to be used in the probabilistic seismic hazard assessment (PSHA) for Istanbul. It defines planar rupture systems for the four main segments of the North Anatolian fault zone (NAFZ) that are critical for the PSHA of Istanbul: segments covering the rupture zones of the 1999 Kocaeli and Düzce earthquakes, central Marmara, and Ganos/Saros segments. In each rupture system, the source geometry is defined in terms of fault length, fault width, fault plane attitude, and segmentation points. Activity rates and the magnitude recurrence models for each rupture system are established by considering geological and geodetic constraints and are tested based on the observed seismicity that is associated with the rupture system. Uncertainty in the SSC model parameters (e.g., b value, maximum magnitude, slip rate, weights of the rupture scenarios) is considered, whereas the uncertainty in the fault geometry is not included in the logic tree. To acknowledge the effect of earthquakes that are not associated with the defined rupture systems on the hazard, a background zone is introduced and the seismicity rates in the background zone are calculated using smoothed-seismicity approach. The state-of-the-art SSC model presented here is the first fully documented and readyto-use fault-based SSC model developed for the PSHA of Istanbul.

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“…The migration of historical catastrophic ruptures along the NAF has been intensively investigated aiming to understand past and present stress distribution, and to improve seismic risk assessment (Toksöz et al, 1979;Ambraseys and Jackson, 2000;Ambraseys, 2002;Hubert-Ferrari et al, 2002;Altunel et al, 2004;Aksoy et al, 2010;Fraser et al, 2010;Uçarkuş et al, 2011;Meghraoui et al, 2012, etc.). In particular, two destructive ruptured sections have been surveyed (offset and length) respectively west and east of the Sea of Marmara: (1) the M w 7.4 1912 Ganos event, and (2) the M w 7.4 1999 Izmit event.…”

Section: Structural Setting and Recent Seismic Activitymentioning

confidence: 99%

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

Beck

Campos

Eriş

et al. 2015

Nat. Hazards Earth Syst. Sci.

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Abstract. In the deep part of the Sea of Marmara (Turkey), the sedimentation developing upon the North Anatolian Fault is strongly influenced by the associated seismic activity, through gravity reworking (fluidized landslides) and tsunamis. Specific layers (homogenites + turbidites, HmTu), representing individual sedimentary events, have been characterized along three giant piston cores retrieved from the Çinarcik and Central (or Orta) basins. Pre-Holocene, nonmarine sediments, were analyzed, representing the last 12-17 kyr BP (before present). For a 2 kyr long interval, 11 events could be precisely correlated on both sides of the Central Basin's southwestern scarp. For each of them, based on the specific depositional process, the thickness difference between the two sites was considered as a direct estimation of the vertical component of a coeval coseismic offset. The homogenite (upper) component accounts for the major part of the thickness difference (ranging from 36 to 144 cm). These offsets were considered as likely representing dominantly vertical throws, along the transtensional southwestern boundary of the inner, pull-apart Central Basin. In terms of natural hazards, further investigations on this local behavior should rather be directed to tsunami genesis.

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Rupture characteristics of the A.D. 1912 Mürefte (Ganos) earthquake segment of the North Anatolian fault (western Turkey)

Cited by 61 publications

References 20 publications

No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging

No significant steady state surface creep along the North Anatolian Fault offshore Istanbul: Results of 6 months of seafloor acoustic ranging

Planar seismic source characterization models developed for probabilistic seismic hazard assessment of Istanbul

Estimation of successive coseismic vertical offsets using coeval sedimentary events – application to the southwestern limit of the Sea of Marmara's Central Basin (North Anatolian Fault)

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