GPS constraints on the deformation of Azerbaijan and surrounding regions

Aktuğ, Bahadır; Meherremov, Elçin; Kurt, Mustafa; Özdemir, Soner Mehmet; Esedov, Namaz; Lenk, Onur

doi:10.1016/j.jog.2012.05.007

Cited by 15 publications

(8 citation statements)

References 18 publications

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“…More realistic models will require better geodetic constraints on the spatial distribution of motions around the eastern segment of the GCFTB. The geodetic measurements using additional stations installed in the Azerbaijan network (Aktuğ et al, 2013) substantiate the activity of the Caspian West fault, which is likely to be a continuation of the GCFTB south of the Caspian Sea. Kadirov et al (2008) assessed a right-lateral slip rate of 11 ± 1 mm y -1 for the Caspian West fault and asserted that this fault is predominantly a strike-slip fault.…”

Section: Geodetic Observations and Lithosphere Deformationmentioning

confidence: 71%

Geodynamics, seismicity, and seismic hazards of the Caucasus

Ismail‐Zadeh

Adamia

Chabukiani

et al. 2020

Earth-Science Reviews

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Being a part of ongoing continental collision between the Arabian and Eurasian plates, the Caucasus region is a remarkable site of moderate to strong seismicity, where devastating earthquakes caused significant losses of lives and livelihood. In this article, we survey geology and geodynamics of the Caucasus and its surroundings; magmatism and heat flow; active tectonics and tectonic stresses caused by the collision and shortening; gravity and density models; and overview recent geodetic studies related to regional movements. The tectonic development of the Caucasus region in the Mesozoic-Cenozoic times as well as the underlying dynamics controlling its development are complicated processes. It is clear that the collision is responsible for a topographic uplift / inversion and for the formation of the fold-and-thrust belts of the Greater and Lesser Caucasus. Tectonic deformations in the region is influenced by the wedge-shaped rigid Arabian block indenting into the relatively mobile region and producing near N-S compressional stress and seismicity in the Caucasus. Regional seismicity is analysed with an attention to sub-crustal seismicity under the northern foothills of the Greater Caucasus, which origin is unclearwhether the seismicity associated with a descending oceanic crust or thinned continental crust. Recent seismic tomography studies are in favour of the detachment of a lithospheric root beneath the Lesser and Greater Caucasus. The knowledge of geodynamics, seismicity, and stress regime in the Caucasus region assists in an assessment of seismic hazard and risk. We look finally at existing gaps in the current knowledge and identify the problems, which may improve our understanding of the regional evolution, active tectonics, geodynamics, shallow and deeper seismicity, and surface manifestations of the lithosphere dynamics. Among the gaps are those related to uncertainties in regional geodynamic and tectonic evolution (e.g., continental collision and associated shortening and exhumation, lithosphere structure, deformation and strain-stress partitioning) and to the lack of comprehensive datasets (e.g., regional seismic catalogues, seismic, gravity and geodetic surveys).

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Section: Geodetic Observations and Lithosphere Deformationmentioning

confidence: 71%

Geodynamics, seismicity, and seismic hazards of the Caucasus

Ismail‐Zadeh

Adamia

Chabukiani

et al. 2020

Earth-Science Reviews

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“…Just to the north of Iran, in Azerbaijan, high strain accumulation occurs across the West Caspian Fault, based on the original findings by Aktuğ et al . [] and Kadirov et al . [].…”

Section: Discussionmentioning

confidence: 99%

A geodetic plate motion and Global Strain Rate Model

Kreemer

Blewitt

Klein

2014

Geochem. Geophys. Geosyst.

782

785

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We present a new global model of plate motions and strain rates in plate boundary zones constrained by horizontal geodetic velocities. This Global Strain Rate Model (GSRM v.2.1) is a vast improvement over its predecessor both in terms of amount of data input as in an increase in spatial model resolution by factor of $2.5 in areas with dense data coverage. We determined 6739 velocities from time series of (mostly) continuous GPS measurements; i.e., by far the largest global velocity solution to date. We transformed 15,772 velocities from 233 (mostly) published studies onto our core solution to obtain 22,511 velocities in the same reference frame. Care is taken to not use velocities from stations (or time periods) that are affected by transient phenomena; i.e., this data set consists of velocities best representing the interseismic plate velocity. About 14% of the Earth is allowed to deform in 145,086 deforming grid cells (0.25 longitude by 0.2 latitude in dimension). The remainder of the Earth's surface is modeled as rigid spherical caps representing 50 tectonic plates. For 36 plates we present new GPS-derived angular velocities. For all the plates that can be compared with the most recent geologic plate motion model, we find that the difference in angular velocity is significant. The rigid-body rotations are used as boundary conditions in the strain rate calculations. The strain rate field is modeled using the Haines and Holt method, which uses splines to obtain an self-consistent interpolated velocity gradient tensor field, from which strain rates, vorticity rates, and expected velocities are derived. We also present expected faulting orientations in areas with significant vorticity, and update the no-net rotation reference frame associated with our global velocity gradient field.Finally, we present a global map of recurrence times for M w 57.5 characteristic earthquakes.

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“…Based on relative positioning, BERNESE processing also gave similar results in Duman and Sanli (2016). Many studies in the literature monitoring tectonics with long baselines to stable plates need to take this into account (Ayhan et al, 2002;Aktug et al, 2015;Reilinger et al, 2006;Ozener et al, 2010). We incorporated relative positioning in the determination of the accuracy of GPS site velocities from GPS campaigns (i.e.…”

Section: Resultsmentioning

confidence: 85%

Assessment of geodetic velocities using GPS campaign measurements over long baseline lengths

Duman

Şanli

2019

Nat. Hazards Earth Syst. Sci.

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Abstract. GPS campaign measurements are frequently used in order to determine geophysical phenomena such as tectonic motion, fault zones, landslides, and volcanoes. When observation duration is shorter, the accuracy of coordinates are degraded and the accuracy of point velocities are affected. The accuracies of the geodetic site velocities from a global network of International GNSS Service (IGS) stations were previously investigated using only PPP. In this study, we extend which site velocities will also be assessed, including fundamental relative positioning. PPP-derived results will also be evaluated to see the effect of reprocessed JPL products, single-receiver ambiguity resolution, repeating survey campaigns minimum 3 days at the site, and eliminating noisier solutions prior to the year 2000. To create synthetic GPS campaigns, 18 globally distributed, continuously operating IGS stations were chosen. GPS data were processed comparatively using GAMIT/GLOBK v10.6 and GIPSY-OASIS II v6.3. The data of synthetic campaign GPS time series were processed using a regression model accounting for the linear and seasonal variation of the ground motion. Once the velocities derived from 24 h sessions were accepted as the truth, the results from sub-sessions were compared with the results of 24 h and hypothesis testing was applied for the significance of the differences. The major outcome of this study is that on global scales (i.e. over long distances) with short observation sessions, the fundamental relative positioning produces results similar to PPP. The reliability of the velocity estimation for GPS horizontal baseline components has now been improved to about 85 % of the average for observation durations of 12 h.

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GPS constraints on the deformation of Azerbaijan and surrounding regions

Cited by 15 publications

References 18 publications

Geodynamics, seismicity, and seismic hazards of the Caucasus

Geodynamics, seismicity, and seismic hazards of the Caucasus

A geodetic plate motion and Global Strain Rate Model

Assessment of geodetic velocities using GPS campaign measurements over long baseline lengths

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