GPS Measurements along the North Anatolian Fault Zone on the Mid-Anatolia Segment

Yavaşoğlu, Hakan; Tarı, Ergin; Karaman, Himmet; Şahin, Muhammed; Baykal, Orhan; Erden, Turan; Bilgi, Serdar; Ruzgar, G.; İnce, Cankut Dağdal; Ergintav, Semih; Çakmak, R.; Tarı, Ufuk; Tüysüz, Okan

doi:10.1007/978-3-540-38596-7_20

Cited by 2 publications

(4 citation statements)

References 13 publications

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“…Among the major branches are the Sungurlu (also referred to as Ezinepazari), Merzifon and Lacin faults (e.g. Barka et al 2000;Hubert-Ferrari et al 2002;Yavasoglu et al 2006Yavasoglu et al , 2011. Palaeomagnetic data indicate that the Sungurlu fault is a boundary between anticlockwise (to the south) and clockwise (to the north) block rotations (Isseven & Tüysüz 2006).…”

Section: T E C T O N I C a N D S E I S M I C S E T T I N G Smentioning

confidence: 99%

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Present-day strain distribution across a segment of the central bend of the North Anatolian Fault Zone from a Persistent-Scatterers InSAR analysis of the ERS and Envisat archives

Peyret

Masson

Yavaşoğlu

et al. 2012

Geophysical Journal International

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The North Anatolian Fault Zone (NAFZ) is the major transform system that accommodates the westward movement of the relatively rigid Anatolian block with respect to Eurasia. Mitigating the hazard associated with devastating earthquakes requires understanding how the NAFZ accumulates and releases the potential energy of elastic deformation both in space and in time.In this study, we focus on the central bend of the NAFZ where the strike of the North Anatolian Fault (NAF) changes from N75 • to N105 • within less than 100 km, and where a secondary fault system veers southwards within the interior of Anatolia. We present interseismic velocity fields obtained from a Persistent-Scatterers (PS) Interferometric radar analysis of ERS and Envisat radar archives. Despite the high vegetation cover, the spatial density of measurements is high (∼10 PS/km 2 in average). Interseismic velocities presented below indicate a velocity change of ∼6-8 mm/yr along the satellite line-of-sight (LOS) mainly centred on the NAF surface trace, and are in good agreement with the GPS velocity field published previously. The observed deformation is accommodated within a zone of ∼20 to 30 km width, in this area where no surface creep has been reported, contrary to the Ismetpasa segment located ∼30 km to the west of this study zone. Although less conspicuous, ∼2-3 mm/yr (∼1 mm/yr along the LOS) of the total deformation seems to be localized along the Lacin Fault. The overall agreement with horizontal GPS measurements suggests that the vertical component of the ground deformation is minor. This is confirmed, over the western part of our study zone, by the 3-D estimation of the ground deformation from the combination of the GPSand the PS-mean velocity fields. However, a specific pattern of the PS velocity fields suggests that an area, enclosed between two faults with roughly south-north orientation, experiences uplift. The PS analyses of radar time-series both prior and posterior to the Izmit and Dûzce earthquakes indicate that these events did not induce detectable velocity changes in this central bend. The only temporal changes we identify are due to a moderate local earthquake (M w 5.7, 1996 August 14) whose precise location and coseismic deformation are determined here. Finally, we propose a model of slip-rate distribution at depth along the NAF from the joint inversion of the GPS and PS mean velocity fields. This model suggests a long-term slip-rate of ∼20 mm/yr for a rather uniform locking depth in the range of 15-20 km. However, the locking depth increases to ∼25-30 km in the section comprised between longitudes E34 • 20' and E34 • 50'. This lateral evolution is in general agreement with the earthquake distribution at depth from three different catalogues.

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Section: T E C T O N I C a N D S E I S M I C S E T T I N G Smentioning

confidence: 99%

“…Even though, historical and instrumental records indicate that it is active (e.g. Ambraseys 2009), its present role in strain accommodation is thought to be minor as attested by recent GPS measurements (Yavasoglu et al 2006). However, this still needs to be assessed with complementary observations.…”

mentioning

confidence: 99%

Present-day strain distribution across a segment of the central bend of the North Anatolian Fault Zone from a Persistent-Scatterers InSAR analysis of the ERS and Envisat archives

Peyret

Masson

Yavaşoğlu

et al. 2012

Geophysical Journal International

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“…Distribution of GPS velocity vectors in north central Anatolia. Velocity vectors are drawn from Yavaşoğlu et al [2004, 2010], and thrusts are after Yılmaz [1982], Yılmaz et al [1993b], Özcan et al [1996], Hakyemez and Papak [2002], Uğuz et al [2002], and Kaymakcı et al [2009].…”

Section: Discussionmentioning

confidence: 99%

“…The nature of present-day deformation of the NCA block can be determined from GPS data, revealing a CCW rotation due to the westward escape of the Anatolian Plate since the neotectonic period [Yavaşoğlu et al, 2004[Yavaşoğlu et al, , 2010. The aim of the study by Yavaşoğlu et al [2004] was to identify block movements between the Sungurlu, Merzifon, and Laçin faults, which are the most important splays of the NAF in central Anatolia (Figure 9). The authors proposed that the velocity vector directions and magnitudes of the GPS vectors are in harmony with escape of the Anatolian Plate toward the west along the North and eastern Anatolian faults.…”

Section: Influence Of the Naf Deformation On Tectonic Rotationsmentioning

confidence: 99%

Middle Eocene paleomagnetic data from the eastern Sakarya Zone and the central Pontides: Implications for the tectonic evolution of north central Anatolia

et al. 2011

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A paleomagnetic investigation has been carried out on Middle Eocene volcanic rocks at 23 sites in the eastern Sakarya Zone and the central Pontides of north central Anatolia in order to better understand the regional tectonic evolution of the main zones of northeastern Anatolia in the Middle Eocene. The results constrain the tectonic evolution of the area when evaluated in conjunction with earlier published paleomagnetic directions from 92 localities. Small counterclockwise rotations in the range of R ± ΔR = −1.3 ± 1.4° to R ± ΔR = −17.2 ± 16.8°, with respect to Eurasia, are observed in the central Pontides on the northern side of the North Anatolian Fault (NAF). Clockwise rotations ranging between R ± ΔR = 8.5 ± 15.1° and R ± ΔR = 29.7 ± 12.0° are observed between the NAF and the Sungurlu Fault (SF), in the eastern Sakarya zone. Counterclockwise rotations of R ± ΔR = −18.9 ± 12.4° to R ± ΔR = −42.2 ± 6.9° are observed to the south of the SF. Our findings, combined with previous data, support the indentation model of Kaymakcı et al. (2000, 2003a, 2003b), which postulates the collision and northeast directed indentation of the Kırşehir Block into the Sakarya Zone. This model, which was developed to explain the evolution of the Çankırı Basin, can also explain the variable magnitudes of paleomagnetically determined rotations, thrust directions, and the curvature of the North Anatolian ophiolite belt.

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GPS Measurements along the North Anatolian Fault Zone on the Mid-Anatolia Segment

Cited by 2 publications

References 13 publications

Present-day strain distribution across a segment of the central bend of the North Anatolian Fault Zone from a Persistent-Scatterers InSAR analysis of the ERS and Envisat archives

Present-day strain distribution across a segment of the central bend of the North Anatolian Fault Zone from a Persistent-Scatterers InSAR analysis of the ERS and Envisat archives

Middle Eocene paleomagnetic data from the eastern Sakarya Zone and the central Pontides: Implications for the tectonic evolution of north central Anatolia

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