Active faults in the Gulf of İzmit on the North Anatolian Fault, NW Turkey: a high-resolution shallow seismic study

Kuşçu, İsmail; Okamura, Makoto; Matsuoka, Hiromi; Awata, Yasuo

doi:10.1016/s0025-3227(02)00357-2

Cited by 46 publications

(32 citation statements)

References 23 publications

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“…However, the active segment of the NAF (NS-NAF) unconformably cuts the basins and ridges in the Marmara Trough along their central axis (İmren et al, 2001;Le Pichon et al, 2001;Gökaşan et al, 2001Gökaşan et al, , 2003Gazioglu et al, 2002;Kuşçu et al, 2002;Demirbag et al, 2003;Rangin et al, 2004;Ş engör et al, 2004). These two different fault systems are clearly seen on a seismic profile from the Tekirdag (Western) Basin (Gökaşan et al, 2003; Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, results from other studies in which detailed multi-beam bathymetric and seismic data were obtained by the Turkish Navy, Department of Navigation, Hydrography and Oceanography and the General Directorate for Mineral Research and Exploration of Turkey have suggested that the NS-NAF cuts the basins and ridges of the Marmara Trough in an unconforming manner instead of forming them (İmren et al, 2001;Le Pichon et al, 2001;Gökaşan et al, 2001Gökaşan et al, , 2003Gazioglu et al, 2002;Kuşçu et al, 2002;Demirbag et al, 2003;Rangin et al, 2004;Ş engör et al, 2004;Fig. 2).…”

Section: Introductionmentioning

confidence: 91%

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An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

Tur

2007

Earth Planet Sp

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Seismic data on the NE Marmara Sea Shelf indicate that a NNE-SSW-oriented buried basin and ridge system exist on the sub-marine extension of the Paleozoic Rocks delimited by the northern segment of the North Anatolian Fault (NS-NAF), while seismic and multi-beam bathymetric data imply that four NW-SE-oriented strike-slip faults also exist on the shelf area. Seismic data indicate that NW-SE-oriented strike-slip faults are the youngest structures that dissect the basin-ridge system. One of the NW-SE-oriented faults (F1) is aligned with a rupture of the North Anatolian Fault (NAF) cutting the northern slope of the Ç ınarcık Basin. This observation indicates that these faults have similar characteristics with the NS-NAF along the Marmara Sea. Therefore, they may have a secondary relation to the NAF since the principle deformation zone of the NAF follows the Marmara Trough in that region. The seismic energy recorded on these secondary faults is much less than that on the NAF in the Marmara Sea. These faults may, however, produce a large earthquake in the long term.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

Tur

2007

Earth Planet Sp

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“…The Holocene deposits here include loose fluvial, palustrine and lacustrine deposits (Figure 3). Seismic studies (Gökaşan et al, 2001;Kurt & Yücesoy, 2009;Kuşçu, Okamura, Matsuoka, & Awata, 2002) and borehole data (Meriç, 1995) suggest that the sediment filling the Gulf of İzmit was deposited at the same time as the Pliocene and younger cover units that crop out in the İzmit-Sapanca Trough and the Adapazarı Depression. In general, the siliciclastic, carbonate and magmatic units in the basements rocks are strongly cemented and resist erosion, except for the Eocene clay-rich marls and shales and some highly weathered pelitic schists.…”

Section: The Tectonic and Geomorphic Settingmentioning

confidence: 99%

The effects of the North Anatolian Fault on the geomorphology in the Eastern Marmara Region, Northwestern Turkey

Tarı

Tüysüz

2015

Geodinamica Acta

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North-western Anatolia has been actively deformed since Pliocene by the right-lateral North Anatolian Fault (NAF). This transform fault, which has a transtensional character in its western end due to effects from the Aegean extensional system, is a major control on the regional geomorphologic evolution. This study applied some geomorphic analyses, such as stream longitudinal profiles, stream length-gradient index, ratio of valley floor width and valley height, mountain front sinuosity, hypsometry and asymmetry factor analyses, to an area just east of the Sea of Marmara in order to understand the tectonic effects on the area's geomorphological evolution. The active and fastest northern branch of the NAF lies within a topographic depression connecting Sea of Marmara in the east to the Adapazarı Basin in the west. This depression filled with early Pleistocene and younger sediment after a series of pull-apart basins opened along the NAF. North of this depression lies the Kocaeli Peneplain, whose southern edge the NAF uplifted. Meandering streams on the central peneplain were incised possibly due to baselevel changes in the Black Sea. South of the depression, an E-trending mountainous area has a rugged morphology. Based on geomorphic analyses, uplifted Pliocene sediment, marine terraces, and recent earthquake activity, this area between northern and southern branches of the NAF is actively uplifting. The geomorphic indices used in this study are sensitive to vertical movements rather than lateral ones. The bedrock lithology that played an important role on the area's geomorphologic evolution also affects the geomorphic indices used here.

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“…(Ansel, 1999;Emre et al, 1999;Gökten et al, 1999;Herece, 1999a, b;Koçyigit et al, 1999;Saglamer et al, 1999;Akman et al, 2001;Tüfekçi et al, 2001. Subsequently, faults in the main land were studied by various researchers (Emre et al, 1999;Gökten et al, 1999;Herece, 1999a, b;Koçyigit et al, 1999;Sucuoglu, 1999;Taymaz, 1999;Cerit et al, 2000) and also, active faults in theİzmit Gulf, which was ascribed as graben (Crampin and Evans, 1986) or a pull-apart basin (Barka, 1997;Bargu and Yüksel, 1993;Akgün and Ergün, 1995;Koral andÖncel, 1995), were determined by a high-resolution shallow seismic method (Kuşçu et al, 2002). Apart these traditional studies, the influences of the 17 August 1999 earthquake and faults of the northwest of Anatolia were investigated by the active (Estrada et al, 2001;Türker and San, 2003;Tüfekçi and Akman, 2004) and passive (Barbieri et al, 1999) satellite data.…”

Section: Introductionmentioning

confidence: 99%

Monitoring The Turbidity and Surface Temperature Changes and Effects of the 17 August 1999 Earthquake in the İzmİt Gulf, Turkey by the Landsat TM/ETM Data

Tüfekçi¹,

Akman²

2005

Environ Monit Assess

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The temporal turbidity and surface temperature changes and effects of the 17 August 1999 earthquake in the Izmit Gulf, Turkey have been investigated using Landsat TM/ETM data. The gulf is in the Mediterranean-Black Sea transition climatic zone and is partially surrounded by green vegetation cover and degraded and densely urbanized-industrialized areas. Landsat TM/ETM data acquired in 1990-1999 confirms increase in turbidity. Turbidity is always low in the southern part and high in the northern part of the gulf, because the more urbanized and industrialized areas are located in the northern part. The Landsat-7 ETM data acquired in the same year (1999) shows seasonal changes in turbidity. Moreover, the two high turbidity and surface temperature anomalies, one of which is parallel to the 17 August 1999 earthquake surface rupture (east-west) and the other which is in the northwest-southeast direction were mapped from Landsat-5 TM data acquired the day (18.08.1999) following the earthquake in the east end of the gulf. On the basis of turbidity implying the sea bottom movement, it is possible to state that a second rupture in the northwest and southeast direction could have occurred at the sea bottom during the earthquake. The distribution of the seismicity centers and the orientation of the lineaments in the area support this finding.

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Active faults in the Gulf of İzmit on the North Anatolian Fault, NW Turkey: a high-resolution shallow seismic study

Cited by 46 publications

References 23 publications

An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

An example of secondary fault activity along the North Anatolian Fault on the NE Marmara Sea Shelf, NW Turkey

The effects of the North Anatolian Fault on the geomorphology in the Eastern Marmara Region, Northwestern Turkey

Monitoring The Turbidity and Surface Temperature Changes and Effects of the 17 August 1999 Earthquake in the İzmİt Gulf, Turkey by the Landsat TM/ETM Data

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