Seismic crust structure beneath the Aegean region in southwest Turkey from radial anisotropic inversion of Rayleigh and Love surface waves

Çakır, Özcan

doi:10.1007/s11600-018-0223-1

Cited by 9 publications

(3 citation statements)

References 168 publications

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“…The linearized inversion system is solved in 20 successive steps and each step is regularized using a damping parameter, which is set to 10.0 in the first step and then linearly decreased to 1.0 at the final step. More details regarding the damped least squares technique are provided in the literature (Lines & Treitel, 1984;Zhou et al, 1992;Herrmann, 2017;Çakır, 2018 and2019).…”

Section: Appendix A: Single-station Group Velocity Dispersion Curve S...mentioning

confidence: 99%

“…The surface wave data of regional origin is due to the global seismicity around and away from the Anatolian plate. The surface wave tomography is commonly used at various scales (i.e., shallow, regional and global) to image the near surface, crustal and upper mantle structures where both Rayleigh and Love surface waves are used (Barmin et al, 2001;Salaün et al, 2012;Kästle et al, 2018;Çakır, 2018 and2019). The proposed method is particularly effective for the surface wave tomography to determine the crustal and upper mantle shear-wave velocity distribution.…”

Section: Introductionmentioning

confidence: 99%

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A New Method for Selecting the Phase and Group Velocity Dispersion Curves of Rayleigh and Love Surface Waves: Real Data Case of Central Anatolia, Turkey (Türkiye)

Çakir,

Kutlu

2023

Idn. J. Earth Sci.

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We propose a new method to select the dispersion curve of Rayleigh and Love surface waves obtained from local and regional earthquakes. This method is efficient for the crustal tomography studies and the Central Anatolia is chosen to test it. The single-station method utilizing both seismograms and accelerograms is used for the group velocities from local earthquakes while the two-station approach utilizing the cross correlograms is employed for the group and phase velocities using both local and regional earthquakes. The proposed method is made of two stages. The first stage based on the multiple filter technique – MFT is designed for an automatic selection of the desired dispersion curve. In case of the single-station approach, the MFT diagrams are computed for both Rayleigh and Love seismograms or accelerograms. An algorithm based on several selection criteria is employed to extract the corresponding group velocity dispersion curve from the MFT diagram. In case of the two-station method, the MFT diagrams are computed for both Rayleigh and Love cross correlograms. The latter algorithm developed for the MFT diagram is again applied to the cross correlogram to select the respective two-station group velocity dispersion curve. To select the corresponding two-station phase velocity dispersion curve, another algorithm is developed where the joint inversion of phase and group velocities is employed. The RMS value quantifying the misfit between the selected and inverted dispersion curves is found minimum when the selected phase velocity curve is compatible with the group velocity curve extracted via the MFT. The selection procedures defined up until this point constitute the first stage. In the second stage, phase and group velocity gathering around base pathways is performed. This way it is possible to compute the averages and standard deviations for the observed pathways traversing the similar geology. The outliers determined by using the averages and standard deviations are eliminated from the data set and this elimination is performed for phase and group velocities, separately.

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Section: Appendix A: Single-station Group Velocity Dispersion Curve S...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Method for Selecting the Phase and Group Velocity Dispersion Curves of Rayleigh and Love Surface Waves: Real Data Case of Central Anatolia, Turkey (Türkiye)

Çakir,

Kutlu

2023

Idn. J. Earth Sci.

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“…We invert the FM phase velocity curve in Figure 6 to retrieve the 1-D shear-wave speed structure (Table 2) beneath the geophone array. The iterative damped least-squares technique (e.g., see Herrmann 2002 [41]; Çakır 2018 [68]) is employed for the inversion and the result is shown in Figure 7. The initial model is selected as a simple model with multiple layers in which the velocities vary from 1010 m/s at the surface to 1140 m/s in the half-space (blue dashed line in Figure 7).…”

Section: Rayleigh Surface Waves Modelingmentioning

confidence: 99%

Theoretical Issues with Rayleigh Surface Waves and Geoelectrical Method Used for the Inversion of Near Surface Geophysical Structure

Çakır

Çoşkun

2021

J. Hum. Earth Future

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We numerically simulate the field measurements of Rayleigh surface waves and electrical resistivity in which the target depth is set to be less than 50-m. The Rayleigh surface waves are simulated in terms of fundamental mode group and phase velocities. The seismic field data is assumed to be collected through a conventional shot-gather. The group velocities are found from the application of the multiple filter technique in a single-station fashion while for the phase velocities the slant stacking, or linear radon transform are applied in fashion of multichannel analysis of surface waves (MASW). The average seismic structure from the source to the receiver (or geophone) is represented by the group velocity curve while the average seismic structure underneath the geophone array is represented by the phase velocity curve. The single-station group velocity curves are transformed into local group velocity curves by setting a linear system through grid points. The shear-wave velocity cross section underneath the examined area is constructed by inverting these local group velocity curves. The electrical resistivity structure of the underground is similarly studied. The field compilation of the resistivity data is assumed to be completed by the application of the multiple electrode Pole-Pole array. The actual resistivity assemble underneath the analyzed area is inverted by considering the apparent (measured) resistivity values. Unique forms such as ore body, cavity, sinkhole, melt, salt, and fluid within the Earth may be examined by joint interpretation of electrical resistivities and seismic velocities. These formations may be better outlined by following their distinct signs such as high/low resistivities and high/low seismic velocities. Doi: 10.28991/HEF-2021-02-03-01 Full Text: PDF

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Mantle lithosphere, asthenosphere and transition zone beneath Eastern Anatolia

et al. 2022

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Seismic crust structure beneath the Aegean region in southwest Turkey from radial anisotropic inversion of Rayleigh and Love surface waves

Cited by 9 publications

References 168 publications

A New Method for Selecting the Phase and Group Velocity Dispersion Curves of Rayleigh and Love Surface Waves: Real Data Case of Central Anatolia, Turkey (Türkiye)

A New Method for Selecting the Phase and Group Velocity Dispersion Curves of Rayleigh and Love Surface Waves: Real Data Case of Central Anatolia, Turkey (Türkiye)

Theoretical Issues with Rayleigh Surface Waves and Geoelectrical Method Used for the Inversion of Near Surface Geophysical Structure

Mantle lithosphere, asthenosphere and transition zone beneath Eastern Anatolia

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