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Comparing multi- and single-exposure speckle contrast optical spectroscopy methods as estimators of blood flow in the diffuse regime. [PDF]

J Biomed Opt
Aleman S, Estrada AD, Parthasarathy AB.
europepmc   +1 more source

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Source-domain full-waveform inversions

GEOPHYSICS, 2019
Conventional full-waveform inversion (FWI) updates a velocity model by minimizing the data residuals between the predicted and observed data at the receiver positions. We have developed a new FWI to update the velocity model by minimizing virtual source artifacts at the receiver positions in the source-domain FWI (SFWI).
Yulang Wu, George A. McMechan
openaire   +1 more source

Combining Full Waveform Inversion and Tomography: Full Waveform Inversion-guided Tomography

Proceedings, 2015
With the new broadband acquisitions, allowing to record frequencies down to 2.5 Hz, and the new tomographic tools, allowing to resolve for vertical velocity components up to 6 Hz, we have moved velocity model building from the situation of a “mid-frequency gap” to the situation of an overlapping area in terms of the resolution we can expect from ...
T. Allemand, G. Lambaré
openaire   +1 more source

Adjustive full waveform inversion

SEG Technical Program Expanded Abstracts 2015, 2015
One fundamental challenge of full waveform inversion(FWI) is the local minimum issue caused by the cycle skipping between the predicted and acquired data. To overcome this challenge and achieve a successful inversion, a good initial model becomes a necessary ingredient of FWI.
Kun Jiao*, Dong Sun, Xin Cheng, Denes Vigh   +3 more
openaire   +1 more source

Decentralized Full-Waveform Inversion

Proceedings, 2018
With the advent of efficient seismic data acquisition, we are having a surplus of seismic data, which is improving the imaging of the earth using full-waveform inversion. However, such inversion suffers from many issues, including (i) substantial network waiting time due to repeated communications of function and gradient values in the distributed ...
Kadu, A.A., Kumar, Rajiv
openaire   +2 more sources

Borehole acoustic full-waveform inversion

GEOPHYSICS, 2023
Full-waveform inversion (FWI) is a technique that has the potential for building high-resolution elastic velocity models. We apply this technique to wireline monopole acoustic logging data to image the near-wellbore formation velocity structures, which can be used in a fluid intrusion evaluation.
Huaigu Tang, Arthur Chuen Hon Cheng, Yunyue Elita Li, Xinding Fang, Ruijia Wang, Xiang Wu   +5 more
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Reweighted variational full-waveform inversions

GEOPHYSICS, 2023
Starting from an initial model and predefined priors, a variational full-waveform inversion (VFWI) seeks posterior distributions of model parameters via optimization using a Bayesian theorem. Thus, VFWI is useful in estimating uncertainties in full-waveform inversions (FWIs).
Wenlong Wang, George A. McMechan, Jianwei Ma   +2 more
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