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2-D analytical P-to-S and S-to-P scattered wave finite frequency kernels

2-D analytical P-to-S and S-to-P scattered wave finite frequency kernels
2-D analytical P-to-S and S-to-P scattered wave finite frequency kernels

Scattered wave imaging provides a powerful tool for understanding Earth's structure. The development of finite frequency kernels for scattered waves has the potential for improving the resolution of both the structure and magnitude of discontinuities in S-wave velocity. Here we present a 2-D analytical expression for teleseismic P-to-S and S-to-P scattered wave finite-frequency kernels for a homogeneous medium. We verify the accuracy of the kernels by comparing to a spectral element method kernel calculated using SPECFEM2D. Finally, we demonstrate the ability of the kernels to recover seismic velocity discontinuities with a variety of shapes including a flat discontinuity, a discontinuity with a sharp step, a discontinuity with a smooth bump, and an undulating discontinuity. We compare the recovery using the kernel approach to expected recovery assuming the classical common conversion point (CCP) stacking approach. We find that the P-to-S kernel increases recovery of all discontinuity structures in comparison to CCP stacking especially for the shallowest discontinuity in the model. The S-to-P kernel is less successful but can be useful for recovering the curvature of shallow discontinuity undulations. Finally, although we observe some variability in the amplitude of the kernels along the discontinuities, the kernels show some potential for recovering the magnitude of the velocity contrast across a discontinuity.

P-to-S and S-to-P converted phases, discontinuity topography, numerical approximations and analysis, numerical modeling, wave propagation, wave scattering and diffraction
1525-2027
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Xie, Yujiang
77c46c7b-1aa6-4534-bca1-8c6a3dd40705
Bogiatzis, Petros
8fc5767f-51a2-4d3f-aab9-1ee9cfa9272d
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Xie, Yujiang
77c46c7b-1aa6-4534-bca1-8c6a3dd40705
Bogiatzis, Petros
8fc5767f-51a2-4d3f-aab9-1ee9cfa9272d

Harmon, Nicholas, Rychert, Catherine A., Xie, Yujiang and Bogiatzis, Petros (2022) 2-D analytical P-to-S and S-to-P scattered wave finite frequency kernels. Geochemistry, Geophysics, Geosystems, 23 (4), [e2021GC010290]. (doi:10.1029/2021GC010290).

Record type: Article

Abstract

Scattered wave imaging provides a powerful tool for understanding Earth's structure. The development of finite frequency kernels for scattered waves has the potential for improving the resolution of both the structure and magnitude of discontinuities in S-wave velocity. Here we present a 2-D analytical expression for teleseismic P-to-S and S-to-P scattered wave finite-frequency kernels for a homogeneous medium. We verify the accuracy of the kernels by comparing to a spectral element method kernel calculated using SPECFEM2D. Finally, we demonstrate the ability of the kernels to recover seismic velocity discontinuities with a variety of shapes including a flat discontinuity, a discontinuity with a sharp step, a discontinuity with a smooth bump, and an undulating discontinuity. We compare the recovery using the kernel approach to expected recovery assuming the classical common conversion point (CCP) stacking approach. We find that the P-to-S kernel increases recovery of all discontinuity structures in comparison to CCP stacking especially for the shallowest discontinuity in the model. The S-to-P kernel is less successful but can be useful for recovering the curvature of shallow discontinuity undulations. Finally, although we observe some variability in the amplitude of the kernels along the discontinuities, the kernels show some potential for recovering the magnitude of the velocity contrast across a discontinuity.

Text
Geochem Geophys Geosyst - 2022 - Harmon - 2‐D Analytical P‐to‐S and S‐to‐P Scattered Wave Finite Frequency Kernels - Version of Record
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More information

Accepted/In Press date: 25 March 2022
e-pub ahead of print date: 1 April 2022
Published date: 22 April 2022
Additional Information: https://doi.org/10.1029/2021GC010290
Keywords: P-to-S and S-to-P converted phases, discontinuity topography, numerical approximations and analysis, numerical modeling, wave propagation, wave scattering and diffraction

Identifiers

Local EPrints ID: 456851
URI: http://eprints.soton.ac.uk/id/eprint/456851
ISSN: 1525-2027
PURE UUID: 7bbaf408-9eca-4bdf-9046-53978e12c06c
ORCID for Nicholas Harmon: ORCID iD orcid.org/0000-0002-0731-768X
ORCID for Petros Bogiatzis: ORCID iD orcid.org/0000-0003-1902-7476

Catalogue record

Date deposited: 12 May 2022 16:57
Last modified: 13 May 2022 01:51

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Contributors

Author: Nicholas Harmon ORCID iD
Author: Yujiang Xie
Author: Petros Bogiatzis ORCID iD

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