Results 101 to 110 of about 636,438 (150)

A discrepancy-based penalty method for extended waveform inversion

, 2017
Extended waveform inversion globalizes the convergence of seismic waveform inversion by adding nonphysical degrees of freedom to the model, thus permitting it to fit the data well throughout the inversion process.
Lei Fu, William W. Symes, Symes, William W., Fu, Lei   +3 more
core   +1 more source

3D velocity-depth model building using surface seismic and well data [PDF]

, 1998
The objective of this work was to develop techniques that could be used to rapidly build a three-dimensional velocity-depth model of the subsurface, using the widest possible variety of data available from conventional seismic processing and allowing for
Sexton, Paul
core  

Automatic seismic-well tie based on cascaded matching optimization method

Frontiers in Earth Science
Seismic-well tie, the alignment of synthetic traces with actual seismic traces at well locations, is a fundamental step in seismic interpretation, inversion, and reservoir prediction.
Mengcheng Li, Xuri Huang, Xuri Huang, Weiping Cao, Yukai Wo, Minghua Xu, Mengyu Ren, Shunkang Lu   +7 more
doaj   +1 more source

Full-waveform inversion reveals diverse origins of lower mantle positive wave speed anomalies

Scientific Reports
Determining Earth’s structure is paramount to unravel its interior dynamics. Seismic tomography reveals positive wave speed anomalies throughout the mantle that spatially correlate with the expected locations of subducted slabs. This correlation has been
Thomas L. A. Schouten, Lars Gebraad, Sebastian Noe, Anna J. P. Gülcher, Solvi Thrastarson, Dirk-Philip van Herwaarden, Andreas Fichtner   +6 more
doaj   +1 more source

WUS324: Multiscale Full Waveform Inversion Approaching Convergence Improves Waveform Fits While Imaging Seismic Structure of the Western United States

Geophysical Research Letters
We report a new model of radially anisotropic crustal and upper mantle structure of the western United States (WUS324) obtained from full waveform inversion of earthquake data. We ran three multiscale inversion stages beyond model WUS256 (Rodgers et al.,
A. J. Rodgers, C. D. Doody, A. Fichtner
doaj   +1 more source

Vers une tomographie haute résolution du manteau inférieur terrestre [PDF]

, 2012
La couche D" est une des zones les plus hétérogène de la Terre, abritant des structures mal comprises, probablement à l'origine de la dynamique globale du manteau. Les méthodes actuelles de tomographie sismique ne résolvent pas correctement cette région.
Schardong, Lewis
core  

Review of advances in Martian focal mechanisms

地球与行星物理论评
Earthquakes represent dynamic processes in rocky planets where accumulated stress leads to sudden rupture, block movement, and energy release. Investigating their origin mechanisms not only advances our understanding of planetary stress accumulation and ...
Kexu Shi, Weijia Sun
doaj   +1 more source

Development and application of the phase-screen seismic modelling code [PDF]

, 2009
As a consequence of the aims of this project, this thesis is divided into two distinct sections. Initially, the computationally efficient phase-screen forward modelling technique is extended to allow investigation of non-normal ray paths.
White, James C.
core  

A misfit function based on entropy regularized optimal transport for full-waveform inversion

, 2018
Given two probability distributions, the classical theorem of optimal transport aims to determine a transport plan which can map one distribution to the other such that the transport cost is minimized.
Peter, Daniel, chen, fuqiang
core   +1 more source

Seismic Multi-Parameter Full-Waveform Inversion Based on Rock Physical Constraints

Applied Sciences
Seismic multi-parameter full-waveform inversion (FWI) integrating velocity and density parameters can fully use the kinematic and dynamic information of observed data to reconstruct underground models. However, seismic multi-parameter FWI is a highly ill-
Cen Cao, Deshan Feng, Jia Tang, Xun Wang
doaj   +1 more source