Theory and Observations - Seismology and the Structure of the Earth: Teleseismic Body-Wave Scattering and Receiver-Side Structure

Bostock, M. G.

doi:10.1016/b978-0-444-53802-4.00008-7

Cited by 3 publications

(3 citation statements)

References 163 publications

(184 reference statements)

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“…Seismologists use them to image discontinuities (i.e. sharp changes in wave velocities) from the crust to the upper mantle (for a complete review, see Bostock 2015). The P-to-S (Ps) converted phases observed in the P-wave coda are probably the most used information for this purpose.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, RFs (or directly the scattered energy) are usually migrated to depth with the use of a reference S-wave velocity model (e.g. Kosarev et al 1999;Bostock 2015). The computational cost is low and, when a sufficiently dense array is available, this kind of method is able to image lateral or even 3-D structures (Ryberg & Weber 2000;Rondenay 2009;Cheng et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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An optimal transport approach to linearized inversion of receiver functions

Hedjazian

Bodin

Métivier

2018

Geophysical Journal International

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Receiver function analysis is widely used to make quantitative inferences about the structure below a seismic station. As these observables are mainly sensitive to traveltimes of phases converted and reflected at seismic discontinuities, the resulting inverse problem is highly non-linear, the solution non-unique, and there are strong trade-offs between the depth of discontinuities and absolute velocities. To overcome this difficulty, we propose to measure the misfit between the predicted and observed data with an optimal transport distance instead of the conventional least-squares distance, a strategy that has shown its assets in the context of full waveform inversion. This approach views a seismogram as a distribution of 'mass'. The optimal transport distance between two waveforms is the minimal cost of transporting one waveform onto the other. We test the optimal transport approach on the inversion of a radial P-wave receiver function. We also show how it can be applied to measure the cross-convolution distance between the radial and vertical components, thus avoiding the need for deconvolution associated with the calculation of the receiver function. The resulting misfit function is minimized with a local optimization algorithm to constrain the receiver-side structure. The benefits of this methodology are studied in simple synthetic tests and with real data. In particular, we show that with its increased sensibility to time-shifts, the optimal transport distance reduces the number of local minima in the misfit function, which, in the case of a linearized inversion, significantly reduces the dependency to the starting model and results in a better convergence towards the solution model. A joint inversion of the P-wave receiver function and surface wave dispersion curves is performed at the Hyderabad station in India.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An optimal transport approach to linearized inversion of receiver functions

Hedjazian

Bodin

Métivier

2018

Geophysical Journal International

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“…A P-wave RF is a time series consisting of a direct P arrival and P-to-S converted pulses generated by underground discontinuities along the receiver-side propagation path (Bostock, 2015). The locations of those discontinuities can be determined by migration techniques.…”

Section: Using Ccp Stacking Technique To Construct the Ps Mohomentioning

confidence: 99%

Moho Complexity in Southern California Revealed by Local PmP and Teleseismic Ps Waves

Yao

et al. 2022

JGR Solid Earth

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The Moho discontinuity represents a petrological boundary separating the Earth's silicic crust from the ultramafic mantle. It is the strongest seismic discontinuity within the Earth's outermost cold shell and even within the whole solid Earth except for the core-mantle boundary. The P-wave velocity contrast across the Moho in continental region can reach ∼20% in the IASP91 model (Kennett & Engdahl, 1991) or ∼15% in the CM95 model (Christensen & Mooney, 1995;Rabbel et al., 2013). Thus, seismic waves derived from the Moho discontinuity, which follow the first arrivals, usually dominate the early portion of a seismogram and serve as an important toolkit to decipher crustal structures (Grad & Tiira, 2009).Both active source surveys and passive seismic studies use Moho-related phases to constrain crustal structures. Active source surveys exploit local Moho-reflected waves PmP and Moho-refracted waves Pn (with frequency typically centered at ∼10 Hz) to investigate the Moho topography and crustal volumetric structure (Grad & Tiira, 2009;Mooney, 2010;Wright et al., 2013). Passive seismic studies sometimes use local Moho-reflected waves PmP or teleseismic Moho-converted waves Ps to image the crustal structure (Figure 1). Local PmP waves

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