Upper-To Mid-Crustal Seismic Attenuation Structure Above the Mantle Wedge in East Anatolia, Turkey: Imaging Crustal Scale Segmentation and Differentiation

dc.authorid Toker, Mustafa/0000-0001-9981-6605
dc.authorscopusid 55347458900
dc.authorscopusid 23005795400
dc.authorwosid Toker, Mustafa/W-3111-2017
dc.contributor.author Toker, Mustafa
dc.contributor.author Sahin, Sakir
dc.date.accessioned 2025-05-10T17:12:05Z
dc.date.available 2025-05-10T17:12:05Z
dc.date.issued 2022
dc.department T.C. Van Yüzüncü Yıl Üniversitesi en_US
dc.department-temp [Toker, Mustafa] Yuzuncu Yil Univ, Fac Engn, Dept Geophys Engn, Van, Turkey; [Sahin, Sakir] Suleyman Demirel Univ, Fac Engn, Dept Geophys Engn, Isparta, Turkey en_US
dc.description Toker, Mustafa/0000-0001-9981-6605 en_US
dc.description.abstract Multi-frequency P-and S -wave attenuation tomography models of Lake Van area (East Anatolia) have been obtained by estimating coda-normalized wave spectra of 3027 local earthquakes (2.0 < Mw < 7.1). The 6998 waveforms sampled from surface to a depth of 25 km, and were recorded from 2004 to 2020 at seven broadband, three-component digital seismic stations operated by Kandilli Observatory and Earthquake Research Institute (KOERI). We adopted a two-point ray-bending method to trace rays in a 3-D velocity model. We applied the coda normalization (CN) method to P- and S-wave data sets. We inverted the spectral data with a multiple resolution seismic attenuation (MuRAT) approach to obtain final tomographic models. On average, high (low) attenuation corresponds to low (high) velocity anomalies. The P-and S -wave attenuation contrasts delimit four well-known geological zones. High frequency-short wavelength attenuation contrasts constrain the 5-km-deep zone of interaction between magma and sediments within the Lake Van basin. Low frequency-long wavelength attenuation anomalies mark the central section of Lake Van between depths of 10 km and 20 km. This zone coincides with a rigid stable shear zone overlying a possible weak-ductile lower crust, interpreted as a detachment. Both low (5-15 km depth) and high attenuation (> 20 km) anomalies mark the area of maximum seismic energy release during the Van event. Their contrast highlights the maximum seismogenetic depth above weak-warm, unstable materials. High attenuation in the SE-part of the Lake Van area coincides with a large hydrothermal and/or magmatic folding-overthrusting, interpreted as a suture-metamorphic complex between depths of 10-15 km. Other minor high-attenuation zones deeper than 5 km focus on complex shear zones in the area damaged by the Van event. The paired attenuation structure of the Lake Van area appears linked to multiple tectonic processes of crust-magma interaction better constrains subsurface segmentation structures and differential deformation types at upper-middle crustal depths. en_US
dc.description.sponsorship Yuzuncu Yil University [2015-M.IM-B119, FBA-2022-9799] en_US
dc.description.sponsorship We would like to thank the Earthquake Department of the Disaster and Emergency Management Presidency (AFAD, Turkey) and the Kandilli Observatory and Earthquake Research Institute (KOERI, Turkey) who made the data available right after the 2011 Van mainshock. The Seismic Analysis Code (SAC) software is used through a large set of data analyses and the figures are plotted using Generic Mapping Tools (GMT, version 4.2.1). This work is an extended, late stage version of the Lake Ercek Seismic Survey project (LESS-2015) and hence, deeply inspired and fully supported by Research Funds of the Yuzuncu Yil University (under Scientific Research Project Numbers: 2015-M.IM-B119 and FBA-2022-9799). Dr. Luca De Siena (University of Aberdeen, Scotland, UK and J. Gutenberg University, Mainz, Germany), who is gratefully acknowledged, greatly improved the work with numerous critical discussions on data set SAC files, resolution of our models and the MuRAT code application to extremely complex orogenic and volcanic regions (in the 36th General Assembly of the European Seismological Commission, ESC2018, Valletta, Malta; Toker and Sahin, 2018; Sahin and Toker, 2018; Toker and Pinar, 2018, 2019). We are extremely thankful to the Editor-in-Chief and the two anonymous reviewers for their constructive and insightful comments and suggestions, which helped us to improve the current manuscript considerably. Finally, we would like to dedicate this paper to the memory of lovely mother Nimet Toker, one of public poets in the country. Her death in March 2022 was a profound loss to the family. She will be deeply missed. en_US
dc.description.woscitationindex Science Citation Index Expanded
dc.identifier.doi 10.1016/j.pepi.2022.106908
dc.identifier.issn 0031-9201
dc.identifier.issn 1872-7395
dc.identifier.scopus 2-s2.0-85133757382
dc.identifier.scopusquality Q2
dc.identifier.uri https://doi.org/10.1016/j.pepi.2022.106908
dc.identifier.uri https://hdl.handle.net/20.500.14720/7798
dc.identifier.volume 329 en_US
dc.identifier.wos WOS:000830895600002
dc.identifier.wosquality Q3
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı en_US
dc.rights info:eu-repo/semantics/closedAccess en_US
dc.subject Lake Van en_US
dc.subject Paired Seismic Attenuation en_US
dc.subject 3-D Velocity en_US
dc.subject Coda-Normalization en_US
dc.subject Multi-Resolution en_US
dc.subject Segmentation-Differentiation en_US
dc.subject Upper-Tomid-Crust en_US
dc.title Upper-To Mid-Crustal Seismic Attenuation Structure Above the Mantle Wedge in East Anatolia, Turkey: Imaging Crustal Scale Segmentation and Differentiation en_US
dc.type Article en_US
dspace.entity.type Publication

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