Crustal Structure of the Eastern Anatolia Region (Turkey) Based on Seismic Tomography

Medved, Irina; Polat, G.; Koulakov, Ivan

doi:10.3390/geosciences11020091

Cited by 20 publications

(12 citation statements)

References 53 publications

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“…But for purposes of mechanicalmathematical modeling the vertical and horizontal velocities must be evaluated in details and in big scale depending on modeling region (Figure 23). Seismotomographic data confirm the existence of a lithospheric window beneath eastern Anatolia, through which hot material of the asthenosphere rises, and this help clarify the deep structure under eastern Anatolia [18,19] (Figure 24).…”

Section: Discussionmentioning

confidence: 94%

Geodynamics of the Caucasus – Anatolian-Arabian region and Turkey-Syria Earthquakes 2023

Svalova¹

2023

J. Basic Appl. Sci.

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The activation of natural disasters in the world requires the development of new approaches to the study of geological processes, in particular, at the boundaries of lithospheric plates, characterized by earthquakes, increased seismicity, volcanism, landslide processes, tsunamis and other dangerous natural processes and hazards. Earthquake of M 7.8 struck south -eastern Turkey and north - western Syria on 6 February 2023. The M 7.8 earthquake is the largest in Turkey since the 1939 Erzincan earthquake, and the second-strongest recorded in the country, after the 1668 North Anatolia earthquake. More than 52,800 deaths were confirmed: more than 46,100 in Turkey, and more than 6,700 in Syria. It is the deadliest natural disaster in Turkey's modern history. The earthquakes caused over US$100 billion in damages. The geodynamic models construction for the deep structure of natural hazards regions is an important contribution to the study of active continental margins, which is necessary for the earthquake forecast, prediction and prognosis, assessing geoecological risks and preparing population actions in the event of natural disasters and catastrophes. The Caucasus - Arabian region is a complex highly-stressed geodynamic structure, characterized by increased heat flow, high seismicity, magmatism and volcanism. The geodynamics of the Caucasus - Arabian region is determined by the collision of the Eurasian and Arabian lithosphere plates, as well as the complex history of the development of the Alpine-Himalayan belt and surrounding territories. The problem solution of geological structures formation and evolution in various complex geodynamic settings and natural hazards forecast and prognosis requires an analysis of all available geological - geophysical data, as well as the formulation and solution of problems of mechanical and mathematical modeling. Slow lithospheric deformations are simulated by models of viscous flow in multi-layered, incompressible, high-viscosity Newtonian fluid, using Navier-Stocks equation and discontinuity equation. The solution of the inverse problem of geodynamics by the direct method is developed. The first inverse problem of geodynamics was solved - the restoration of the velocity fields, pressures and stresses at the depth of the lithosphere according to the available data on the velocities on the surface. The second inverse problem of geodynamics has been posed and solved - the determination of the movement of boundaries at the depth of the lithosphere based on the given movements of the surface. The solutions obtained can be used to analyze deep geodynamic problems, and together with geothermal modeling, geological and geophysical methods and seismic tomography can serve as a reliable apparatus for studying deep geodynamics due to the formation and evolution of geological structures and the lithosphere stress-strain state researches. The solution of the problem is analyzed on the example of the Caucasus - Arabian region geodynamics. The Geodynamic concept of geoenvironment has been developed. Geodynamic models of the regions of hazardous natural processes in order to predict and prevent natural disasters and catastrophes are constructed. An algorithm for creating monitoring systems is suggested.

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Section: Discussionmentioning

confidence: 94%

Geodynamics of the Caucasus – Anatolian-Arabian region and Turkey-Syria Earthquakes 2023

Svalova¹

2023

J. Basic Appl. Sci.

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“…We use the Local Tomography Software (LOTOS) to estimate the three‐dimensional isotropic seismic velocity structure (Koulakov, 2009). LOTOS has been successfully applied to a variety of tectonic settings (e.g., collision zones: Talebi et al., 2020; Medved et al., 2021, subduction zones: Foix et al., 2019, ocean‐continent transition zone: El Khrepy et al., 2021 and paleo‐rift system in eastern Canada: Onwuemeka et al., 2021). Starting with a 1‐D (i.e., layered) velocity model, the software calculates the travel times based on a reference table of initial event locations, and uses a grid search method to relocate all events (Koulakov & Sobolev, 2006).…”

Section: Methodsmentioning

confidence: 99%

Seismic Evidence for a Weakened Thick Crust at the Beaufort Sea Continental Margin

Estève

Liu

Koulakov

et al. 2022

Geophysical Research Letters

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The Canadian Beaufort Sea continental margin of northwestern Canada is a Cenozoic convergent margin, potentially representing a rare case of incipient subduction. Here, we produce P‐ and S‐wave seismic velocity models of the crust and the uppermost mantle using recordings from regional earthquakes. Our models reveal a northwest‐dipping very low‐velocity anomaly within the crust (δV up to −15%) beneath the Romanzof Uplift. We interpret this low‐velocity feature to correspond to a weaker and thicker crust due to shortening and stacking of igneous and sedimentary rocks. The co‐location of the thickened crust and lack of present‐day seismicity indicates that north‐south compression is accommodated by slow, aseismic deformation in the narrow margin beneath the Romanzof Uplift or more broadly offshore. Neither interpretation requires nor precludes a subduction initiation process.

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“…We use the Local Tomography Software (LOTOS) to estimate the three-dimensional isotropic seismic velocity structure (Koulakov, 2009). LOTOS has been successfully applied to a variety of tectonic settings (e.g., collision zones: Talebi et al (2020); Medved et al (2021), subduction zones: 2021)). Starting with a 1-D (i.e., layered) velocity model, the software calculates the travel times based on a reference table of initial event locations, and uses a grid search method to relocate all events (Koulakov & Sobolev, 2006).…”

Section: Methodsmentioning

confidence: 99%

Seismic evidence for a weakened thick crust at the Beaufort Sea continental margin

Estève

Liu

Koulakov

et al. 2022

Preprint

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The Canadian Beaufort Sea continental margin of northwestern Canada is a Cenozoic convergent margin, potentially representing a rare case of incipient subduction. Here, we produce P-and S-wave seismic velocity models of the crust and the uppermost mantle using recordings from regional earthquakes. Our models reveal a northwest-dipping very low-velocity anomaly within the crust (δV up to -15%) beneath the Romanzof Uplift. We interpret this low-velocity feature to correspond to a weaker and thicker crust due to shortening and stacking of igneous and sedimentary rocks. The co-location of the thickened crust and lack of present-day seismicity indicates that north-south compression is accommodated by slow, aseismic deformation in the narrow margin beneath the Romanzof Uplift or more broadly offshore. Neither interpretation requires a subduction initiation process.

show abstract

Crustal Structure of the Eastern Anatolia Region (Turkey) Based on Seismic Tomography

Cited by 20 publications

References 53 publications

Geodynamics of the Caucasus – Anatolian-Arabian region and Turkey-Syria Earthquakes 2023

Geodynamics of the Caucasus – Anatolian-Arabian region and Turkey-Syria Earthquakes 2023

Seismic Evidence for a Weakened Thick Crust at the Beaufort Sea Continental Margin

Seismic evidence for a weakened thick crust at the Beaufort Sea continental margin

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