Models and Frechet kernels for frequency-(in)dependent Q
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Date
2014
Publication Type
Journal Article
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yes
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Abstract
We present a new method for the modelling of frequency-dependent and frequencyindependent Q in time-domain seismic wave propagation. Unlike previous approaches, attenuation models are constructed such that Q as a function of position in the Earth appears explicitly as a parameter in the equations of motion. This feature facilitates the derivation of Fréchet kernels for Q using adjoint techniques. Being simple products of the forward strain field and the adjoint memory variables, these kernels can be computed with no additional cost, compared to Fréchet kernels for elastic properties. The same holds for Fréchet kernels for the power-law exponent of frequency-dependent Q, that we derive as well. To illustrate our developments, we present examples from regional- and global-scale time-domain wave propagation. © The Authors 2014. Published by Oxford University Press on behalf of The Royal Astronomical Society.
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published
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Volume
198 (3)
Pages / Article No.
1878 - 1889
Publisher
Oxford University Press
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Subject
Tomography; Seismic attenuation; Computational seismology; Theoretical seismology; Wave propagation
Organisational unit
03476 - Giardini, Domenico / Giardini, Domenico
03971 - Fichtner, Andreas / Fichtner, Andreas
Notes
Accepted 16 June 2014, In original form 16 June 2014, Received 14 April 2014. It was possible to publish this article open access thanks to a Swiss National Licence with the publisher