Interseismic Strain Accumulation in the Marmara Sea Region

Ayhan, Mehmet Emin

doi:10.1785/0120000818

Cited by 40 publications

(41 citation statements)

References 30 publications

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“…Meade et al (2002) concluded that the northern branch of the NAFZ is more active as clearly shown by relative motion of about 24 mm/year which has been disclosed by GPS observations. This conclusion was also supported by ), McClusky et al (2000 and Ayhan et al (2002). Meade et al (2002) pointed out that the strain accumulation in the Marmara Sea region is highly localized along the straight fault geometry with a shallow locking depth of 6-7 km.…”

Section: Discussionmentioning

confidence: 64%

“…Historical seismicity and recent GPS studies indicate that the northern branch has been more active, followed by the southern branch and then by the central one Finkel, 1991, 1995;Oral et al, 1995;Barka and Reilinger, 1997;Barka, 1999;Ayhan et al, 2002;Finkel, 2002). In addition, recent detailed micro-earthquake studies show that the seismicity has been most active along the northern branch (Üçer et al, 1997;Bariş et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Detailed investigations of geology and tectonics of the Marmara Sea and its surrounding regions have been made (Ş engör et al, 1985;Yilmaz et al, 1995;Üçer et al, 1997;Gürbüz et al, 2000;Yaltirak, 2002). GPS measurements have been conducted to estimate the relative rates of displacement of the Anatolian Block with respect to Eurasia (Starub andKahle, 1994, 1997;Oral et al, 1995;Barka and Reilinger, 1997;Ayhan et al, 2002). Marine seismic experiments have been carried out across the pull-apart basins and the active fault traces beneath the Marmara Sea to obtain detailed information on shallow fault structures and fault movements (Smith et al, 1995;Okay et al, 1999;Demirbag et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional structure of Vp, Vs and Vp/Vs in the upper crust of the Marmara region, NW Turkey

et al. 2005

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We applied a 3-D seismic tomography inversion algorithm to arrival-time data obtained, during 18 years from 1985 to 2002, from local seismic networks and aftershock studies in the Marmara region, in order to better understand the upper crustal structure of the complex tectonic region. We integrated all the available data set into a common data set and relocated the events, using a 1-D velocity model. We then selected 3,949 earthquakes and obtained 92355 arrival times, in total, consisting of 59,313 P-wave and 33,042 S-wave arrival times. In this paper we present detailed crustal structures for V p, V s and V p/V s ratios from the surface down to 15 km depth with good resolution in terms of the hit count analysis of seismic rays, the checkerboard and restoring resolution tests for the studied region. The results obtained from the inversion suggest that the western part of the North Anatolian Fault Zone shows strong lateral heterogeneity. We concluded that no clear pattern exists between the distribution of microearthquakes and aftershocks and the velocity perturbations presented in this paper. This is probably due to complex tectonic and geological structures. Large coseismic slip associated with the two recent strong earthquakes was found to correspond to higher velocity anomalies, as was often found recently. On the other hand, low velocity values correspond to the sedimentary units or the alluvium regions, as supported by the low resistivity and gravity values. Thus the results presented in this paper are quite consistent with the other data such as gravity, resistivity and magnetic anomalies, indicating that our model is reliable and efficient and it should be useful for further interpretation of tectonic and geological problems in this region. It should be pointed out, however, that the results of S-wave perturbations and V p/V s ratio could not be discussed in detail because of insufficient quality of the S-wave data and the reliability of the results is not very high. Nonetheless, the fact that recent large Izmit earthquake and moderate aftershocks that occurred in or around the high velocity zones near the low velocity region suggests that high velocity regions found in the area close to Istanbul in the Marmara Sea and also at the Iznik-Mekece fault are potential sites for strain energy accumulation and release.

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Section: Discussionmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-dimensional structure of Vp, Vs and Vp/Vs in the upper crust of the Marmara region, NW Turkey

et al. 2005

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“…Many researches were conducted along the fault for investigating seismic potential (Stein et al, 1997;Barka and Reilinger, 1997;Reilinger et al, 2000Reilinger et al, , 2006Ayhan et al, 2002;Ergintav et al, 2002Ergintav et al, , 2007Meade et al, 2002;Ozener et al, 2009). The GCM-ITU network, that we focused, was established around Iznik region, and the points of network scattered along the middle strand.…”

Section: Introductionmentioning

confidence: 99%

Investigation of long period crustal deformation on the inactive branch of the North Anatolian Fault Zone

Akay

Özener

2009

Nat. Hazards Earth Syst. Sci.

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Abstract. The western part of North Anatolian Fault (NAF) bifurcates around Mudurnu into two fault segments: northern and southern branch. The latter bifurcates again at west of Pamukova and creates middle strand. This study aimed to analyze crustal movement along the middle strand near Iznik which is considered as inactive fault. We focused on a microgeodetic network called General Command of MappingIstanbul Technical University (GCM-ITU) network around this segment. In order to obtain displacement values, five campaigns performed on the network which were used in the study. The displacements of the stations were estimated relative to the fixed stations located at the south of the network. The coordinates of the stations were calculated from the triangulation measurements realized in 1941 and 1963 , trilateration measurements in 1981 , and GPS campaigns in 2004. Then, mean displacements of the network ranging between 7 mm/yr and 18 mm/yr were obtained for these years.In the second part of the study, the GPS data were reprocessed by adding three stations from Marmara Continuous GPS Network (MAGNET). Details of MAGNET can be found Ergintav et al. (2002). Estimated displacements were ranging between 3 mm/yr and 13 mm/yr for 2004 and 2007. TUBI station of IGS network was taken as stable.

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“…The western Anatolian, southern Aegean and western Mediterranean lithospheres move on average 25 mm year -1 anticlockwise in relation to the Eurasian plate (Clarke et al 1998;McClusky et al 2000;Ayhan et al 2002;Meade et al 2002). While the subduction rate is 18 mm year -1 along the Hellenic Arc in the south of the Mediterranean, the Pliny-Strabo fault located in the north of the Hellenic Arc and Fethiye-Burdur fault yield a 10 mm year -1 movement defined by the Global Positioning System (GPS) (Reilinger et al 2006).…”

Section: Bathymetry and Gpsmentioning

confidence: 99%

Seismotectonic content by the source parameters of the 10 June 2012 Ölüdeniz-Fethiye (Dodecanese Islands) Mw 6.1 earthquake and aftershocks (southwestern Turkey)

et al. 2015

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A detailed source and rupture process analyzes of the 10 June 2012 Ö lüdeniz-Fethiye (Dodecanese Islands; Mw 6.1) earthquake has been carried out using inversion of both complex body waves and strong ground motion records. The rupture starting from the hypocenter propagated gradually to the southwest. The main rupture is modeled by a main asperity located 2-3 km beneath the hypocenter and two small asperities. The size of the effective source area is about 24 9 12 km, the rupture duration was approximately 12 s and the total seismic moment was estimated to be 1.955 9 10 18

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Interseismic Strain Accumulation in the Marmara Sea Region

Cited by 40 publications

References 30 publications

Three-dimensional structure of Vp, Vs and Vp/Vs in the upper crust of the Marmara region, NW Turkey

Three-dimensional structure of Vp, Vs and Vp/Vs in the upper crust of the Marmara region, NW Turkey

Investigation of long period crustal deformation on the inactive branch of the North Anatolian Fault Zone

Seismotectonic content by the source parameters of the 10 June 2012 Ölüdeniz-Fethiye (Dodecanese Islands) Mw 6.1 earthquake and aftershocks (southwestern Turkey)

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