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Joint inversion of teleseismic and ambient noise Rayleigh waves for phase velocity maps, an application to Iceland

Joint inversion of teleseismic and ambient noise Rayleigh waves for phase velocity maps, an application to Iceland
Joint inversion of teleseismic and ambient noise Rayleigh waves for phase velocity maps, an application to Iceland
We present a method for joint inversion of teleseismic and ambient noise Rayleigh wave data for phase velocity maps from 18 to 50?s period. We adapt the two-plane wave method for teleseismic data to include ambient noise phase data. We apply the method to data from Iceland's ICEMELT and HOTSPOT arrays. Checkerboard tests show that the joint inversion improves phase velocity model recovery over methods that use the data sets independently, particularly at 18?s period. The addition of ambient noise data also extends resolution to shallower depths and shorter periods in comparison to previous teleseismic results beneath Iceland. We show there are significant differences in the phase velocity maps from the joint approach in comparison to other approaches, for instance, using only teleseismic data, only ambient noise data, or the mean of the two. The difference in phase velocities in turn affects the resulting shear velocity models. The advantage of the joint inversion is that it produces a single phase velocity map that satisfies both data sets simultaneously. Our phase velocity maps show a transition from low velocities centered beneath the main volcanic centers in Iceland at 18–25?s period, primarily crustal depths, to a low-velocity region that traces the rift zones from the Reykjanes Ridge in the south to the Kolbeinsey Ridge in the north at 29–50?s period, greater depths. These results are consistent with previous studies, although with an extended and improved region of resolution, which extends further into the Atlantic and Arctic Ocean.
Iceland, surface waves, interferometry, noise
5966-5987
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Rychert, Catherine A.
70cf1e3a-58ea-455a-918a-1d570c5e53c5

Harmon, Nicholas and Rychert, Catherine A. (2016) Joint inversion of teleseismic and ambient noise Rayleigh waves for phase velocity maps, an application to Iceland. Journal of Geophysical Research: Solid Earth, 121 (8), 5966-5987. (doi:10.1002/2016JB012934).

Record type: Article

Abstract

We present a method for joint inversion of teleseismic and ambient noise Rayleigh wave data for phase velocity maps from 18 to 50?s period. We adapt the two-plane wave method for teleseismic data to include ambient noise phase data. We apply the method to data from Iceland's ICEMELT and HOTSPOT arrays. Checkerboard tests show that the joint inversion improves phase velocity model recovery over methods that use the data sets independently, particularly at 18?s period. The addition of ambient noise data also extends resolution to shallower depths and shorter periods in comparison to previous teleseismic results beneath Iceland. We show there are significant differences in the phase velocity maps from the joint approach in comparison to other approaches, for instance, using only teleseismic data, only ambient noise data, or the mean of the two. The difference in phase velocities in turn affects the resulting shear velocity models. The advantage of the joint inversion is that it produces a single phase velocity map that satisfies both data sets simultaneously. Our phase velocity maps show a transition from low velocities centered beneath the main volcanic centers in Iceland at 18–25?s period, primarily crustal depths, to a low-velocity region that traces the rift zones from the Reykjanes Ridge in the south to the Kolbeinsey Ridge in the north at 29–50?s period, greater depths. These results are consistent with previous studies, although with an extended and improved region of resolution, which extends further into the Atlantic and Arctic Ocean.

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More information

Accepted/In Press date: 5 August 2016
e-pub ahead of print date: 25 August 2016
Published date: 15 September 2016
Keywords: Iceland, surface waves, interferometry, noise
Organisations: Geology & Geophysics

Identifiers

Local EPrints ID: 402268
URI: http://eprints.soton.ac.uk/id/eprint/402268
PURE UUID: 61dc9ce6-2799-409e-b9e0-d4d7b880003c
ORCID for Nicholas Harmon: ORCID iD orcid.org/0000-0002-0731-768X

Catalogue record

Date deposited: 02 Nov 2016 14:00
Last modified: 15 Mar 2024 03:33

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