Results 21 to 30 of about 3,299,598 (299)

Regional-scale joint seismic body- and surface-wave travel time tomography

地球与行星物理论评, 2023
To make full use of seismograms to put tight constraints on the structure of subsurface and earthquake sources has always been the research focus in seismology.
Hongjian Fang, Ying Liu, Huajian Yao, Haijiang Zhang   +3 more
doaj   +1 more source

On the use of neural networks for full waveform inversion

Computer Methods in Applied Mechanics and Engineering, 2023
Neural networks have recently gained attention in solving inverse problems. One prominent methodology are Physics-Informed Neural Networks (PINNs) which can solve both forward and inverse problems. In the paper at hand, full waveform inversion is the considered inverse problem. The performance of PINNs is compared against classical adjoint optimization,
Leon Herrmann, Tim Bürchner, Felix Dietrich, Stefan Kollmannsberger   +3 more
openaire   +3 more sources

Full Waveform Inversion for NDT using ultrasonic linear arrays

Research and Review Journal of Nondestructive Testing, 2023
Ultrasonic (UT) imaging is a widespread technique for nondestructive testing (NDT). The state-of-the-art UT image reconstruction algorithms are based on delay-and-sum (DAS) operations, which assume constant acoustic velocity across the tested objects ...
Daniel Rossato, Felipe Derewlany Gutierrez, Giovanni A. Guarneri, Thiago Alberto Rigo Passarin, Gustavo P. Pires, Daniel Rodrigues Pipa   +5 more
doaj   +1 more source

Convolution Coding and Amplitude Attenuation-Based Full Waveform Inversion

IEEE Access, 2020
Full waveform inversion (FWI) is a powerful method to reconstruct the properties of the subsurface media. However, the standard FWI is a non-unique and ill-posed inversion problem, which requires proper techniques to avoid cycle skipping phenomena ...
Shiqi Dong, Liguo Han, Pan Zhang, Qiang Feng, Yuchen Yin   +4 more
doaj   +1 more source

Full waveform inversion for bore reconstruction of woodwind-like instruments

Acta Acustica, 2021
The internal geometry of a wind instrument can be estimated from acoustic measurements. For woodwind instruments, this involves characterizing the inner shape (bore) but also the side holes (dimensions and location).
Ernoult Augustin, Chabassier Juliette, Rodriguez Samuel, Humeau Augustin   +3 more
doaj   +1 more source

Full Waveform Inversion and the Truncated Newton Method [PDF]

SIAM Review, 2013
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Métivier, Ludovic, Brossier, Romain, Operto, Stéphane, Virieux, Jean   +3 more
openaire   +6 more sources

Waveform inversion of the S reflector west of Spain: fine structure of a detachment fault. [PDF]

, 2005
The S reflection west of Iberia has been interpreted as a low-angle detachment fault separating crustal fault blocks from partially serpentinized mantle. We apply full waveform inversion to investigate the fine structure of S.
Minshull, TA, Reston, Timothy J., Reston, T.J., Leythaeuser, T., Reston, Timothy, Minshull, T.A., Minshull, T. A., Leythaeuser, T   +7 more
core   +1 more source

The imprint of crustal density heterogeneities on regional seismic wave propagation [PDF]

, 2016
Density heterogeneities are the source of mass transport in the Earth. However, the 3-D density structure remains poorly constrained because travel times of seismic waves are only weakly sensitive to density.
A. Fichtner, A. Płonka, Seismology, NWO-VIDI: Full waveform inversion for upper-mantle density structure, Plonka, A.I., Blom, N.A., Fichtner, A., N. Blom   +7 more
core   +2 more sources

Full waveform tomographic images of the peak ring at the Chicxulub impact crater [PDF]

, 2011
17/06/013 PDF version attached, OK to pub.Peak rings are a feature of large impact craters on the terrestrial planets and are generally believed to be formed from deeply buried rocks that are uplifted during crater formation.
Grieve, R. A. F., J. V. Morgan, P. J. Barton, G. L. Christeson, Morgan, J. V., Gulick, S. P. S., Warner, MR, R. A. F. Grieve, Barton, PJ, Christeson, G. L., Grieve, RAF, Warner, M. R., Morgan, JV, M. R. Warner, S. P. S. Gulick, Christeson, GL, Gulick, SPS, Collins, G. S., G. S. Collins, Collins, GS, Barton, P. J.   +20 more
core   +1 more source

Simultaneous Inversion of Layered Velocity and Density Profiles Using Direct Waveform Inversion (DWI): 1D Case

Frontiers in Earth Science, 2022
To better interpret the subsurface structures and characterize the reservoir, a depth model quantifying P-wave velocity together with additional rock’s physical parameters such as density, the S-wave velocity, and anisotropy is always preferred by ...
Zhonghan Liu, Yingcai Zheng, Hua-Wei Zhou   +2 more
doaj   +1 more source