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<p>This study analyzed 135 teleseismic earthquakes with high signal-to-noise ratios between 2018 and 2024 with the new local network. Time domain iterative deconvolution applied to the rotated radial-transverse-vertical components, after Gaussian low-pass filtering, yields receiver functions; crustal thickness and Vp/Vs ratio are then determined through H-<i>κ</i> stacking across finely sampled grids, with theoretical Ps, PpPs, and PsPs phase travel times calculated for each stacking parameter pair. Our results reveal Moho depths from ~ 26.9&#xa0;km near the Tuzla Fault zone to ~ 36&#xa0;km beneath the northern Menderes-Kula region. Within this range, representative H-<i>κ</i> solutions include <i>H</i>&#xa0;≈&#xa0;29.7&#xa0;km and <i>κ</i>&#xa0;≈&#xa0;1.56 at the Kiraz Basin station (DKRZ), <i>H</i>&#xa0;≈&#xa0;27.6&#xa0;km and <i>κ</i>&#xa0;≈&#xa0;1.80 beneath the Karaburun Peninsula (KARB station), and <i>H</i>&#xa0;≈&#xa0;31.0&#xa0;km and <i>κ</i>&#xa0;≈&#xa0;2.07 at Simav region (SIMV), with Poisson’s ratios of ~ 0.16, ~ 0.28, and ~ 0.35. Across the network, <i>κ</i> spans 1.50–2.07 and Poisson’s ratio 0.10–0.35. An eastward increase in Moho depth mirrors the extensional tectonic framework of Western Anatolia, while lateral variations in <i>κ</i> reveal localized thermal and compositional anomalies, with cooler, silica-rich crust beneath the Kiraz Basin (DKRZ) and a hotter, mafic-influenced lower crust indicated by the high <i>κ</i> values at the SIMV. Comparison with the CRUST1.0 model shows Moho depth discrepancies of up to ~ 5&#xa0;km. We interpret these crustal profiles in the context of the region’s deformation and magmatic history, integrating constraints from previous geological and geophysical studies. By combining receiver function analysis, global crustal models and geodynamic interpretation, this work refines the crustal velocity structure beneath Western Anatolia and provides improved input for regional seismic hazard assessment.</p>

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The Moho beneath Western Anatolia: new seismological constraints within a regional tectonic context

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Berkay Kalkar,
  • Elçin Gök

摘要

This study analyzed 135 teleseismic earthquakes with high signal-to-noise ratios between 2018 and 2024 with the new local network. Time domain iterative deconvolution applied to the rotated radial-transverse-vertical components, after Gaussian low-pass filtering, yields receiver functions; crustal thickness and Vp/Vs ratio are then determined through H-κ stacking across finely sampled grids, with theoretical Ps, PpPs, and PsPs phase travel times calculated for each stacking parameter pair. Our results reveal Moho depths from ~ 26.9 km near the Tuzla Fault zone to ~ 36 km beneath the northern Menderes-Kula region. Within this range, representative H-κ solutions include H ≈ 29.7 km and κ ≈ 1.56 at the Kiraz Basin station (DKRZ), H ≈ 27.6 km and κ ≈ 1.80 beneath the Karaburun Peninsula (KARB station), and H ≈ 31.0 km and κ ≈ 2.07 at Simav region (SIMV), with Poisson’s ratios of ~ 0.16, ~ 0.28, and ~ 0.35. Across the network, κ spans 1.50–2.07 and Poisson’s ratio 0.10–0.35. An eastward increase in Moho depth mirrors the extensional tectonic framework of Western Anatolia, while lateral variations in κ reveal localized thermal and compositional anomalies, with cooler, silica-rich crust beneath the Kiraz Basin (DKRZ) and a hotter, mafic-influenced lower crust indicated by the high κ values at the SIMV. Comparison with the CRUST1.0 model shows Moho depth discrepancies of up to ~ 5 km. We interpret these crustal profiles in the context of the region’s deformation and magmatic history, integrating constraints from previous geological and geophysical studies. By combining receiver function analysis, global crustal models and geodynamic interpretation, this work refines the crustal velocity structure beneath Western Anatolia and provides improved input for regional seismic hazard assessment.