Zobrazeno 1 - 10
of 164
pro vyhledávání: '"Malcolm Sambridge"'
Autor:
Fabrizio Magrini, Malcolm Sambridge
Publikováno v:
Mathematics, Vol 11, Iss 22, p 4686 (2023)
We present a theoretical framework that links Fermat’s principle of least time to optimal transport theory via a cost function that enforces local transport. The proposed cost function captures the physical constraints inherent in wave propagation;
Externí odkaz:
https://doaj.org/article/043eb4498fb7467587259125c998f62c
Autor:
Trine Enemark, Luk JM Peeters, Dirk Mallants, Okke Batelaan, Andrew P. Valentine, Malcolm Sambridge
Publikováno v:
Water, Vol 11, Iss 7, p 1463 (2019)
Conceptual uncertainty is considered one of the major sources of uncertainty in groundwater flow modelling. In this regard, hypothesis testing is essential to increase system understanding by refuting alternative conceptual models. Often a stepwise a
Externí odkaz:
https://doaj.org/article/ddc4a45be67041a89760ca04cbf9a5cf
Autor:
Jared Magyar, Malcolm Sambridge
Publikováno v:
Hydrology and Earth System Sciences. 27:991-1010
When working with hydrological data, the ability to quantify the similarity of different datasets is useful. The choice of how to make this quantification has a direct influence on the results, with different measures of similarity emphasising partic
Publikováno v:
Geophysical Journal International, 233 (2)
SUMMARY Concerns raised by Okazaki & Ueda (2022) on the paper by Sambridge et al. (2022) are addressed. Two issues are discussed and some new numerical results presented. The first concerns whether the properties of the Wasserstein time-series misfit
Publikováno v:
RAS Techniques and Instruments. 2:207-215
Regularized least-squares tomography offers a straightforward and efficient imaging method and has seen extensive application across various fields. However, it has a few drawbacks, such as (i) the regularization imposed during the inversion tends to
Many Earth systems cannot be observed directly, or in isolation. Instead, we must infer their properties and characteristics from their signature in one or more datasets, using a variety of techniques (including those based on optimization, statistic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fee3e7e01ac1d422963bc4613df50e66
https://doi.org/10.5194/egusphere-egu23-12173
https://doi.org/10.5194/egusphere-egu23-12173
Publikováno v:
Geophysical Journal International, 2022, Vol.230(2), pp.916-931 [Peer Reviewed Journal]
SUMMARY Monte Carlo methods are widespread in geophysics and have proved to be powerful in non-linear inverse problems. However, they are associated with significant practical challenges, including long calculation times, large output ensembles of Ea
The core-mantle boundary (CMB) is the most extreme boundary within the Earth where the liquid, iron-rich outer core interacts with the rocky, silicate mantle. The nature of the lowermost mantle atop the CMB, and its role in mantle dynamics, is not co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4fa33883684d90aba0ef9a534f066c1c
https://doi.org/10.31223/x5mg8v
https://doi.org/10.31223/x5mg8v
Publikováno v:
Geophysical Journal International, 2022, Vol.231(1), pp.172-198 [Peer Reviewed Journal]
Geophysical Journal International
Geophysical Journal International
We propose a new approach to measuring the agreement between two oscillatory time series, such as seismic waveforms, and demonstrate that it can be employed effectively in inverse problems. Our approach is based on Optimal Transport theory and the Wa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51925228147a852d05a3053f9b9a6092
Autor:
Andrew Valentine, Malcolm Sambridge
Publikováno v:
Journal of Open Source Software, 2022, Vol.7(76), pp.4217 [Peer Reviewed Journal]
The package pyprop8 enables calculation of the response of a 1-D layered halfspace to a seismic source, and also derivatives (‘sensitivity kernels’) of the wavefield with respect to source parameters. Seismograms, seismic spectra, and measures of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5a8f85d412157a2764ecd617cbd4aec2
http://dro.dur.ac.uk/36850/
http://dro.dur.ac.uk/36850/