Results 31 to 40 of about 218,560 (299)
Two-Dimensional Full-Waveform Joint Inversion of Surface Waves Using Phases and Z/H Ratios
Applied Sciences, 2021 Surface-wave dispersion and the Z/H ratio are important parameters used to resolve the Earth’s structure, especially for S-wave velocity. Several previous studies have explored using joint inversion of these two datasets.
Chao Zhang, Ting Lei, Yi Wang
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, 2022 Unscented Kalman inversion is a novel method that uses unscented Kalman filter to solve inverse problems. This paper applies it to inverse multiple geophysical observations simultaneously (i.e., Multi-task unscented Kalman inversion (MUKI)). In this method, the model parameters are updated iteratively in a derivative-free way, and a Gaussian ...
Longlong Wang +5 more
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Frontiers in Earth Science, 2023 As an airborne electromagnetic method induced by natural sources, the Z-axis tipper electromagnetic (ZTEM) system can primarily recover near-surface shallow structures, due to band-limited frequencies (usually 30–720 Hz) of the airborne survey and high ...
Xiaoyue Cao +6 more
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Flexible Coupling in Joint Inversions: A Bayesian Structure Decoupling Algorithm [PDF]
Journal of Geophysical Research: Solid Earth, 2018 AbstractWhen different geophysical observables are sensitive to the same volume, it is possible to invert them simultaneously to jointly constrain different physical properties. The question addressed in this study is to determine which structures (e.g., interfaces) are common to different properties and which ones are separated.
Nicola Piana Agostinetti, Thomas Bodin
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Dizhen xuebao, 2018 利用弹性波的初至波和面波，应用交叉梯度算子，联合反演了近地表的二维纵横波速度和衰减参数，并提出了采用一维弹性波正演模拟，应用二维Tikhonov正则化，同时反演出二维速度模型和衰减模型的方法。理论模型测试和实际数据应用结果均表明本文算法极大地提高了计算效率，同时能够反演出可靠的速度模型和衰减模型。
Yue Wang, Jie Zhang
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Saddlepoint approximations for noncentral quadratic forms [PDF]
, 1998 Many estimators and tests are of the form of a ratio of quadratic forms in normal variables. Excepting a few very special cases little is known about the density or distribution of these ratios, particularly if we allow for noncentrality in the quadratic
Marsh, P.W.N.
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Reservoir characterization in an underground gas storage field using joint inversion of flow and geodetic data [PDF]
, 2015 Characterization of reservoir properties like porosity and permeability in reservoir models typically relies on history matching of production data, well pressure data, and possibly other fluid-dynamical data.
Bechor Ben Dov, Noah +9 more
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High-resolution seismic inversion method based on joint data-driven in the time-frequency domain
Artificial Intelligence in GeosciencesSeismic inversion can be divided into time-domain inversion and frequency-domain inversion based on different transform domains. Time-domain inversion has stronger stability and noise resistance compared to frequency-domain inversion.
Yu Liu, Sisi Miao
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, 2013 This paper presents a new joint inversion approach to shape-based inverse problems. Given two sets of data from distinct physical models, the main objective is to obtain a unified characterization of inclusions within the spatial domain of the physical ...
Abriola, Linda M. +4 more
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Algorithms, 2020 Often, multiple geophysical measurements are sensitive to the same subsurface parameters. In this case, joint inversions are mostly preferred over two (or more) separate inversions of the geophysical data sets due to the expected reduction of the non ...
Christin Bobe +3 more
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