Results 21 to 30 of about 3,297,474 (208)
Earth Sciences Research Journal, 2018 This paper investigates the capability of acoustic Full Waveform Inversion (FWI) in building Marmousi velocity model, in time and frequency domain. FWI is an iterative minimization of misfit between observed and calculated data which is generally solved ...
Sagar Singh +2 more
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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 +7 more
core +2 more sources
Optimal Inversion Method Based on Joint Waveform Inversion and Least Squares Reverse Time Migration [PDF]
LithosphereJoint Waveform inversion (JWI) uses the results of reflection waveform inversion (RWI) as the initial model for full waveform inversion (FWI). Compared with the FWI, the JWI method can obtain more information about the structure of the subsurface medium.
Kai Zhang +4 more
doaj +1 more source
Applied Sciences, 2023 The elastic full-waveform inversion (EFWI) method efficiently utilizes the amplitude, phase, and travel time information present in multi-component seismic recordings to create detailed parameter models of subsurface structures.
Qiyuan Qi +3 more
doaj +1 more source
Applied Mathematics in Science and Engineering, 2023 Full waveform inversion (FWI) can provide an accurate velocity model by matching observed and simulated seismograms. Mathematically, FWI is a highly ill-posed inverse problem that the observed data are independent of the model and cannot be inverted ...
Hongsun Fu, Hongyu Qi, Ruixue Gu
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Simulation scripts and data for full waveform inversion using spyro
, 2021 Python scripts, meshes, and P-wave velocity models that were used to perform the 2D and 3D full waveform inversion (FWI) experiments documented in the paper titled "Full waveform inversion using triangular waveform-adapted ...
Keith J. Roberts
core +1 more source
Earth and Planetary Physics, 2021 The nearly analytic discrete (NAD) method is a kind of finite difference method with advantages of high accuracy and stability. Previous studies have investigated the NAD method for simulating wave propagation in the time-domain.
DeYao Zhang +5 more
doaj +1 more source
3D variable-grid full-waveform inversion on GPU
Petroleum Science, 2019 Full-waveform inversion (FWI) is a powerful tool to reconstruct subsurface geophysical parameters with high resolution. As 3D surveys become widely implemented, corresponding 3D processing techniques are required to solve complex geological cases, while ...
Zi-Ying Wang +5 more
doaj +1 more source
Full Waveform Inversion Based on an Asymptotic Solution of Helmholtz Equation
Geosciences, 2023 This study considers the full waveform inversion (FWI) method based on the asymptotic solution of the Helmholtz equation. We provide frequency-dependent ray tracing to obtain the wave field used to compute the FWI gradient and calculate the modeled data.
Maxim Protasov +3 more
doaj +1 more source
PyFWI: A Python package for full-waveform inversion and reservoir monitoring
SoftwareX, 2023 Full-waveform inversion (FWI) of seismic data is a technique that can be used to image the subsurface as well as to monitor time-lapse changes in the subsurface (TL-FWI).
Amir Mardan +2 more
doaj +1 more source