The seismotectonics of the Marmara region (Turkey): results from a microseismic experiment

Gurbuz, C.; Aktar, Mustafa; Eyidoǧan, Haluk; Cisternas, A.; Haessler, H.; Barka, Aykut; Ergin, M.; Türkelli, N.; Polat, Orhan; Üçer, S. Balamir; Kuleli, Sadi; Barış, Şerif; Kaypak, Bülent; Bekler, Tolga; Zor, Ekrem; Biçmen, Faruk; Yörük, Ahmet

doi:10.1016/s0040-1951(99)00253-x

Cited by 116 publications

(35 citation statements)

References 12 publications

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“…1a). This area has previously been suggested to be a seismic gap (Gurbuz et al, 2000), characterized by its low seismicity. The seismic moment released by the scenario earthquake is 2.0 1020 N m, which is an average value of the seismic moments estimated by different authors for the 1999 Izmit earthquake .…”

Section: Input Scenariosmentioning

confidence: 91%

“…A total fault length of 130 km is used, which is confined to the area between the 1999 Izmit rupture to the east and the 1912 Ganos rupture to the west. We assume a surface-rupturing fault with a width of 20 km in agreement with the depth of the seismogenic zone as indicated by the depth distribution of seismicity (Gurbuz et al, 2000). The fault-plane solution used is the one of with pure rightlateral strike-slip faulting along the CMF and an oblique-normal mechanism along the NBF.…”

Section: Input Scenariosmentioning

confidence: 99%

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Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sørensen¹,

Pulido²,

Atakan³

2007

Bulletin of the Seismological Society of America

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Section: Input Scenariosmentioning

confidence: 91%

Section: Input Scenariosmentioning

confidence: 99%

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sørensen¹,

Pulido²,

Atakan³

2007

Bulletin of the Seismological Society of America

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“…Similar features were also found by the analysis of the results of the combined modeling of gravity and reflection seismic data collected in the Marmara Sea region (Adatepe et al 2002). The crustal seismic structure in the western part of the NAF was investigated by different research groups (e.g., Gurbuz et al 2000;Nakamura et al 2002;Baris et al 2005;Salah et al 2007) using several tomographic studies. Another study (Karabulut et al 2003) used a 2D tomographic seismic velocity image in the eastern Marmara region along a N-S trending seismic refraction profile that traverses the Cinarcık Basin in the Sea of Marmara (see Fig.…”

Section: Introductionmentioning

confidence: 53%

Investigating P- and S-wave velocity structure beneath the Marmara region (Turkey) and the surrounding area from local earthquake tomography

2016

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We investigated the crustal structure beneath the Marmara region and the surrounding area in the western part of the North Anatolian fault zone. These areas have high seismicity and are of critical significance to earthquake hazards. The study was based on travel-time tomography using local moderate and micro-earthquakes occurring in the study area recorded by the Multi-Disciplinary Earthquake Research in High Risk Regions of Turkey project and Kandilli Observatory and Earthquake Research Institute. We selected 2131 earthquakes and a total of 92,858 arrival times, consisting of 50,044 P-wave and 42,814 S-wave arrival times. We present detailed crustal structure down to 50 km depth beneath the Marmara region for P-and S-wave velocities using the LOTOS code based on iterative inversion. We used the distributions of the resulting seismic parameters (Vp, Vs) to pick out significant geodynamical features. The high-velocity anomalies correlate well with fracturing segments of the North Anatolian fault. High seismicity is mostly concentrated in these segments. In particular, low velocities were observed beneath the central Marmara Sea at 5 km depth.

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“…• orientation, but σ 1 and σ 2 are very close in size, and may indicate either a strike-slip regime or extension (Gurbuz et al, 2000). A series of strong earthquakes broke the NAF from east to west (Figure 1), starting with the M S = 7.4, Erzincan destructive earthquake of 1939.…”

Section: Introductionmentioning

confidence: 98%

“…In this work, we will apply Hurst method to the study of the historical and instrumental seismicity of the Marmara region, which includes the northern Marmara seismic gap, and the site of the 1999 Izmit earthquake, as a complement to previous studies concerning their space organization (Gurbuz et al, 2000;Polat et al 2002aPolat et al , 2002b. The catalog of historical seismicity gives a time window long enough to analyze the future behaviour of the system as a whole.…”

Section: Introductionmentioning

confidence: 99%

The Marmara Sea region: Seismic behaviour in time and the likelihood of another large earthquake near Istanbul (Turkey)

Cisternas

Polat

Rivera

2004

Journal of Seismology

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The North Anatolian Fault (NAF) extends for about 1500 km from Karliova to the east, to the Egean Sea in the west. The Marmara region, located near the western end of the NAF, is a tectonically active zone characterized by the transition between a strike slip stress regime and an extensional one in the Aegean Sea. Microseismic studies performed around the Marmara Sea in 1995 [Tectonophysics 316, 2000, 1], and just before the 1999 Izmit Earthquake (Bull. Seism. Soc. Am. 92, 2002a, 361; J. Seismol. 6, 2002b, 287) permitted the analysis of the evolution of seismicity connected to this destructive earthquake and its sequels. Several observations indicate that the aftershock distribution fits well the EW orientation of the NAF, but the ruptures are not simple and linear as a first glance would suggest. Instead they are segmented in at least five pieces as shown by the slip variation and aftershock clusters, showing complexity at different scales (Bull. Seism. Soc. Am. 92, 2002a, 361). There is still a gap, across the northern border of the Marmara Sea that has not ruptured, and this is the only sector that did not break on the NAF since the 1939 great Erzincan earthquake. Will it rupture as a whole with a large magnitude earthquake, or by segments with smaller magnitude events? The Hurst analysis of the overall behaviour of the seismicity in the Marmara region since historical times shows that if a large earthquake occurs in the near future, it might break the complete gap. The Hurst character of the time variation of seismicity is persistent with H = 0.82. The aftershocks of the 1999 Izmit earthquake can be analyzed by using the Hurst method, showing an exceptionally high persistent memory.

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The seismotectonics of the Marmara region (Turkey): results from a microseismic experiment

Cited by 116 publications

References 12 publications

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Sensitivity of Ground-Motion Simulations to Earthquake Source Parameters: A Case Study for Istanbul, Turkey

Investigating P- and S-wave velocity structure beneath the Marmara region (Turkey) and the surrounding area from local earthquake tomography

The Marmara Sea region: Seismic behaviour in time and the likelihood of another large earthquake near Istanbul (Turkey)

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