Radoslav Nakov

Bulgarian Academy of Sciences

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B. C. Burchfiel

Massachusetts Institute of Technology

V. Kotzev

Bulgarian Academy of Sciences

R. W. King

Universidad Católica de la Santísima Concepción

Nikolay Dimitrov

Institute of Cryobiology and Food Technology

Tzanko Tzankov

South-West University "Neofit Rilski"

Tz. Georgiev

University of Architecture, Civil Engineering and Geodesy

Angel Todosov

Bilbil Nurçe

Polytechnic University of Tirana

L. H. Royden

Massachusetts Institute of Technology

Angel Kunov

Bulgarian Academy of Sciences

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Bulgarian Academy of Sciences

Geological Institute

Massachusetts Institute of Technology

Russian Academy of Sciences

National Institute of Geophysics, Geodesy and Geography

Planetary Science Institute

Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences

Saints Cyril and Methodius University of Skopje

American University in Bulgaria

Utrecht University

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Recent GPS results on the geodynamics of the area around Sofia (Central-Western Bulgaria)

Review of the Bulgarian Geological Society (2020)

Nikolay Dimitrov Radoslav Nakov

The paper outlines recent results from estimation of 23 years GPS measurements on the geodynamic network around Sofia. The obtained result, clearly provide new more accurate GPS geodynamic data on the considered area. All velocities clearly exceed 1.5–2 mm/y reaching up to 3–4 mm/y. As a general tendency the velocities tend to increase from North to South. According to the new results analysis of geological processes is given. The newly acquired velocities from three campaigns 1997, 2000 and 2020 years confirm that the general tendency of movement of the stations in the region of Central West Bulgaria is in the south direction with respect to stable Eurasia. The velocities tend to increase from north to south. This pattern is in agreement with the extensive movement of southern Bulgaria and northern Greece. The new results provide much better accuracy, reliability and local details.

geodynamics

10.52215/rev.bgs.2020.81.3.241

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Citations (8)

The Sub‐Balkan graben system of central Bulgaria

Basin Research (1996)

Tz. Tzankov D. Angelova Radoslav Nakov B. C. Burchfiel L. H. Royden

The Sub‐Balkan graben system in central Bulgaria forms the present northern boundary of the Aegean extensional region. This east‐trending graben system lies along the southern flank of the Stara Planina range and consists mainly of half‐grabens. The sedimentary fill in the grabens ranges in age from late Miocene to Recent and records the initiation and evolution of the graben system. The sedimentary fill in the grabens is oldest in the central graben and becomes progressively younger to the west and east, indicating a diachronous development of the grabens. Grabens are formed in the hangingwalls of south‐dipping low‐angle normal faults which have been displaced by younger higher angle normal faults along the foot of the Stara Planina. Hangingwall rocks have been complexly faulted and rotated such that some graben fill has been rotated down‐to‐the‐north. The Sredna Gora range south of the grabens is part of a complexly faulted and rotated hangingwall block bounded on the south by south‐dipping normal faults forming the northern boundary of the Thracian Basin. The Stara Planina range has been formed by uplift and rotation due to footwall unloading along the low‐angle normal faults and forms the northern margin of the graben system. Most of the topography of Bulgaria south of the Sub‐Balkan graben system is the result of late Miocene to Recent extensional processes linked to the Aegean region that have been superposed on convergent features and earlier extensional features that extend back to late Eocene time.

Horst and graben

Extensional tectonics

Diachronous

Half-graben

10.1046/j.1365-2117.1996.01452.x

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Citations (36)

NW Bulgaria — The Northern Boundary of the Aegean Extensional Domain

International Association of Geodesy symposia (2002)

V. Kotzev Radoslav Nakov B. C. Burchfiel R. W. King

Extensional tectonics

10.1007/978-3-662-04709-5_84

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Citations (4)

Monitoring of recent crustal movements in the region of western Bulgaria. Results from 2023

Review of the Bulgarian Geological Society (2023)

Nikolay Dimitrov Radoslav Nakov

The region of west Bulgaria and especially southwest Bulgaria is geodynamically active region due to the large number of active faults. The observation of geodynamic processes using GNSS measurements in the area has been going on for more than 26 years involving 38 stations. This article shows the latest results of the monitoring of modern crustal movements in the area. Presently, 26 points are measured, 10 of them newly added. GNSS data obtained from periodic campaign measurements between 1997 and 2023 are processed and analyzed to obtain the result of points movements geodynamic network and deformation accumulation. As a result of many years of periodic measurements, much more accurate and reliable results for point velocities are obtained. The velocity rates are between 1–2 mm/y in the north and 3–4 mm/y in the southernmost part of the area. The new results clearly confirm this as well as the extensive movement of southwestern Bulgaria to the south. The results obtained from the addition of 10 new points and the expansion of the network provide better and more detailed information and can be used for detailed geodynamic and geological research of the active tectonics in the area.

geodynamics

10.52215/rev.bgs.2023.84.3.333

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Citations (0)

Patterns of Cenozoic Extensional Tectonism in the South Balkan Extensional System

NATO science series. Series IV, Earth and environmental sciences (2008)

B. C. Burchfiel R. W. King Radoslav Nakov Tzanko Tzankov Nikola Dumurdžanov

Paleogene

Diachronous

Rollback

Extensional tectonics

10.1007/978-1-4020-6815-7_1

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Citations (14)

Long-term monitoring of recent crustal movements in the region of Southwestern Bulgaria. Results from 2022

Review of the Bulgarian Geological Society (2022)

Nikolay Dimitrov Radoslav Nakov

This article examines the study of modern crustal movements in the region of southwestern Bulgaria, a geologically and seismically active region with the presence of numerous fault structures. The main method of obtaining deformation information is by using GNSS measurements. The monitoring of geodynamic processes in the area has been going on for more than 25 years. GNSS data obtained from periodic campaign measurements between 1997 and 2022 are processed and analyzed to obtain the deformation accumulation result in southwestern Bulgaria. As a result of long-term measurements, more and more accurate and reliable results are obtained for the velocities of the points. A certain relationship has been established between the modern movements of the Earth’s crust, seismic events and tectonic structures. This extensive movement of southern Bulgaria and northern Greece is also confirmed. The results can be used for a detailed geodynamic and geological study of the active fault structures in the area.

geodynamics

10.52215/rev.bgs.2022.83.3.293

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Citations (1)

Crustal Motion and Strain Accumulation in the South Balkan Region Inferred from GPS Measurements

NATO science series. Series IV, Earth and environmental sciences (2008)

V. Kotzev R. W. King B. C. Burchfiel Angel Todosov Bilbil Nurçe

African Plate

10.1007/978-1-4020-6815-7_2

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Citations (16)

GPS Constraints on the Kinematics of Southwestern Bulgaria