Results 151 to 160 of about 2,936 (205)

Quantitative Analysis of Phase Response Enhancement in Distributed Acoustic Sensing Systems Using Helical Fiber Winding Technology. [PDF]

Sensors (Basel)
Duan Y, Du S, Chen T, Guo C, Wu S, Liang L.   +5 more
europepmc   +1 more source

Application of Distributed Acoustic Sensing for Active Near-Surface Seismic Monitoring. [PDF]

Sensors (Basel)
Roshdy E, Majdański M, Długosz S, Marciniak A, Popielski P.   +4 more
europepmc   +1 more source

Long-term dynamics of earthquake swarms in the Yellowstone caldera. [PDF]

Sci Adv
Florez MA, Li BQ, Shelly DR, Angulo MV, Sanabria-Gómez JD.   +4 more
europepmc   +1 more source

Echo Intensity Correction Method for Ultrasound Computed Tomography in Musculoskeletal Imaging. [PDF]

Bioengineering (Basel)
Zeng J, Lou D, Zhang Q, Zhang H, Zhu H, Cheng X, Wang T, Xu S, Ling Y, Ding M.   +9 more
europepmc   +1 more source

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ω-FWI: Robust full-waveform inversion with Fourier-based metric

2022
Full-waveform inversion is a cutting-edge methodology for recovering high-resolution subsurface models. However, one of the main conventional full-waveform optimization problems challenges is cycle-skipping, usually leading us to an inaccurate local minimum model.
Izzatullah, Muhammad, Alkhalifah, Tariq
openaire   +1 more source

Iterative direct waveform inversion (IDWI) plus Fourier-domain full waveform inversion (FWI)

2015 Workshop: Depth Model Building: Full-waveform Inversion, Beijing, China, 18-19 June 2015, 2015
Both full waveform inversion (FWI) and iterative direct waveform inversion (IDWI) were suggested for reconstruction of velocity model using seismic data. In FWI algorithm, the partial derivative wave field of parameter is used to define the amplitude of update.
Changsoo Shin*, Jungmin Kwon
openaire   +1 more source

Efficient 3D Frequency-domain Full Waveform Inversion (FWI) with Phase Encoding

71st EAGE Conference and Exhibition incorporating SPE EUROPEC 2009, 2009
3D high resolution imaging methods such as full waveform inversion still suffer from their expensive computational cost, for instance because of the huge amount of data characterized by numerous shots and receivers.
Ben Hadj Ali, H., Operto, S., Virieux, J.   +2 more
openaire   +2 more sources

JMI-FWI: Cascading Workflow Using Joint Migration Inversion (JMI) and Full Waveform Inversion (FWI)

Second EAGE/PESGB Workshop on Velocities, 2019
Summary Data driven Velocity Model Building (VMB) based on Full Waveform Inversion requires very broad band, especially low frequnecy data content to overcome the cycle skipping problem. In this paper we demonstrate how the Joint Migration Inversion method introduced by the DELHPI consortium group applied in a cascaded workflow to preduce a hich ...
G. Eisenberg-Klein, E.(D.J.). Verschuur, S. Qu, E. Schünemann   +3 more
openaire   +1 more source

3D DAS Full Waveform Inversion (FWI) Case Study for SAGD Steam Chamber Imaging

NSG2021 27th European Meeting of Environmental and Engineering Geophysics, 2021
Summary Distributed Acoustic Sensing (DAS) is based on Rayleigh scattering principles used to determine acoustic strain signals over long distances, effectively turning the optic fiber cable into a series of geophones. Once the data is acquired, advanced processing techniques such as Full Waveform Inversion (FWI) can be applied to obtain information ...
W. Wang, H. Feng, T. Kay, A. Knudsen, A. Ayre   +4 more
openaire   +1 more source