GROWTH-23: An integrated code for inversion of complete Bouguer gravity anomaly or temporal gravity changes

Camacho, Antonio G.; Vajda, Peter; Fernández, José

doi:10.1016/j.cageo.2023.105495

Computers & Geosciences

2024

DOI: 10.1016/j.cageo.2023.105495

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GROWTH-23: An integrated code for inversion of complete Bouguer gravity anomaly or temporal gravity changes

Antonio G. Camacho,

Peter Vajda,

José Fernández

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2024

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Cited by 3 publications

References 25 publications

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Volcanic Unrest After the 2021 Eruption of La Palma

Fernández,

Escayo,

Prieto

et al. 2024

Geophysical Research Letters

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La Palma, Canary Islands, had its largest historical eruption in 2021. From January 2022 to May 2023 there were >2,100 seismic events, primarily at depths ≤20 km, prompting us to update the deformation and modeling study, using interferometric synthetic aperture radar observations and a last generation interpretation tool. We detect the evolution of the remaining magmatic body in the SW portion of the island, with arrival of new magma moving into the oceanic crust out to sea, and a pressurized zone in the central‐eastern area, at regions of structural weakness. The current source characteristics have some similarities to the early stage dynamics prior to the 2021 eruption. Operational and multidisciplinary studies must continue to monitor either their stabilization or growth and destabilization. The ability to identify magma ascent using only deformation data over short time periods allows us to characterize unrest patterns and provide new insights into volcanic processes.

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Volcanic Unrest After the 2021 Eruption of La Palma

Fernández,

Escayo,

Prieto

et al. 2024

Geophysical Research Letters

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Gravimetric inversion based on model exploration with growing source bodies (Growth) in diverse earth science disciplines

Vajda,

Bódi,

Camacho

et al. 2024

MATH

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<abstract> <p>Gravimetry is a discipline of geophysics that deals with observation and interpretation of the earth gravity field. The acquired gravity data serve the study of the earth interior, be it the deep or the near surface one, by means of the inferred subsurface structural density distribution. The subsurface density structure is resolved by solving the gravimetric inverse problem. Diverse methods and approaches exist for solving this non-unique and ill-posed inverse problem. Here, we focused on those methods that do not pre-constrain the number or geometries of the density sources. We reviewed the historical development and the basic principles of the Growth inversion methodology, which belong to the methods based on the growth of the model density structure throughout an iterative exploration process. The process was based on testing and filling the cells of a subsurface domain partition with density contrasts through an iterative mixed weighted adjustment procedure. The procedure iteratively minimized the data misfit residuals jointly with minimizing the total anomalous mass of the model, which facilitated obtaining compact meaningful source bodies of the solution. The applicability of the Growth inversion approach in structural geophysical studies, in geodynamic studies, and in near surface gravimetric studies was reviewed and illustrated. This work also presented the first application of the Growth inversion tool to near surface microgravimetric data with the goal of seeking very shallow cavities in archeological prospection and environmental geophysics.</p> </abstract>

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Posterior analysis of particle swarm optimization results applied to gravity inversion in sedimentary basins

Pallero,

Fernández-Muñiz,

Fernández-Martínez

et al. 2024

MATH

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<abstract><p>As is well known, it is impossible to model reality with its true level of detail. Additionally, it is impossible to make an infinite number of observations, which are always contaminated by noise. These circumstances imply that, in an inverse problem, the misfit of the best estimated model will always be less than that of the true one. Therefore, it is not possible to reconstruct the model that actually generated the collected observations. The best way to express the solution of an inverse problem is as a collection of models that explain the observations at a certain misfit level according to a defined cost function. One of the main advantages of global search methods over local ones is that, in addition to not depending on an initial model, they provide a set of generated models with which statistics can be made. In this paper we present a technique for analyzing the results of any global search method, particularized to the particle swarm optimization algorithm applied to the solution of a two-dimensional gravity inverse problem in sedimentary basins. Starting with the set of generated models, we build the equivalence region of a predefined tolerance which contains the best estimated model, i.e., which involves the estimated global minimum of the cost function. The presented algorithm improves the efficiency of the equivalence region detection compared to our previous works.</p></abstract>

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GROWTH-23: An integrated code for inversion of complete Bouguer gravity anomaly or temporal gravity changes

Cited by 3 publications

References 25 publications

Volcanic Unrest After the 2021 Eruption of La Palma

Volcanic Unrest After the 2021 Eruption of La Palma

Gravimetric inversion based on model exploration with growing source bodies (Growth) in diverse earth science disciplines

Posterior analysis of particle swarm optimization results applied to gravity inversion in sedimentary basins

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