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Resolving crustal thickness using SS waveform stacks

Resolving crustal thickness using SS waveform stacks
Resolving crustal thickness using SS waveform stacks
We image lithospheric interfaces using variations in the character of SS waveform stacks, a method we term SS Lithospheric Interface Profiling (SSLIP). The variations are caused by reflected phases, that is, underside reflections (SS precursors) and topside multiples (SS reverberations), created at velocity discontinuities near the midpoint of the SS ray path. Stacks from continental versus oceanic bounce point regions produce distinctly different SS waveforms, consistent with the large continent/ocean difference in crustal thickness. To investigate the potential of SS waveform stacks to constrain Moho depths under continents, we develop a method to fit continental bounce point stacks with a reference SS waveform convolved with a crustal operator. The SSLIP inferred Moho depths agree with the CRUST 2.0 model in Asia for those regions where the SS bounce point density is the highest. The SSLIP depths are correlated (correlation coefficient 0.82) with the CRUST 2.0 values averaged over sample bins of 10° radius. The SSLIP method has broad lateral resolution in comparison to most other methods for resolving crustal thickness, but has the potential to sample regions where station coverage may be sparse.
0956-540X
1128-1137
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Shearer, Peter M.
608a51f5-3369-49f1-adb4-4e565bef4b8c
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Shearer, Peter M.
608a51f5-3369-49f1-adb4-4e565bef4b8c

Rychert, Catherine A. and Shearer, Peter M. (2010) Resolving crustal thickness using SS waveform stacks. Geophysical Journal International, 180 (3), 1128-1137. (doi:10.1111/j.1365-246X.2009.04497.x).

Record type: Article

Abstract

We image lithospheric interfaces using variations in the character of SS waveform stacks, a method we term SS Lithospheric Interface Profiling (SSLIP). The variations are caused by reflected phases, that is, underside reflections (SS precursors) and topside multiples (SS reverberations), created at velocity discontinuities near the midpoint of the SS ray path. Stacks from continental versus oceanic bounce point regions produce distinctly different SS waveforms, consistent with the large continent/ocean difference in crustal thickness. To investigate the potential of SS waveform stacks to constrain Moho depths under continents, we develop a method to fit continental bounce point stacks with a reference SS waveform convolved with a crustal operator. The SSLIP inferred Moho depths agree with the CRUST 2.0 model in Asia for those regions where the SS bounce point density is the highest. The SSLIP depths are correlated (correlation coefficient 0.82) with the CRUST 2.0 values averaged over sample bins of 10° radius. The SSLIP method has broad lateral resolution in comparison to most other methods for resolving crustal thickness, but has the potential to sample regions where station coverage may be sparse.

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Published date: 2010
Organisations: Geology & Geophysics

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Local EPrints ID: 351767
URI: http://eprints.soton.ac.uk/id/eprint/351767
ISSN: 0956-540X
PURE UUID: c8296df9-315d-4144-904f-fda4c7a31b43

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Date deposited: 24 Apr 2013 09:55
Last modified: 14 Mar 2024 13:43

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Author: Peter M. Shearer

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