Upgraded software for structural gravity inversion and application to El Hierro (Canary Islands)

Camacho, Antonio; Prieto, Juan Francisco; Aparicio, Alfredo; Ancochea, Eumenio; Fernández, José

doi:10.1016/j.cageo.2021.104720

Cited by 15 publications

(8 citation statements)

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“…Here we use the Growth inversion approach, which belongs to the class of inversion methods that make no a priori assumptions about the number and shape of the sources (Camacho et al 1997(Camacho et al , 2000(Camacho et al , 2002(Camacho et al , 2011a(Camacho et al , 2011b(Camacho et al , 2020(Camacho et al , 2021aCannavó et al 2015;Fernández et al 2021). It seeks the sources as being represented by a free aggregation of subsurface rectangular cells (prisms) filled in by a userprescribed constant differential density value or alternatively by a set of several density values (with a prescribed step) that may vary from cell to cell.…”

Section: Methods Applied To Interpret the Tenerife 2004-2005 Gravity ...mentioning

confidence: 99%

“…The topographically corrected (Bouguer) gravity anomalies/disturbances represent the gravitational effect of subsurface anomalous density distribution (Vajda et al 2006(Vajda et al , 2020. The inversion approach underwent several improvements and refinements over time leading to the GROWTH-2 and GROWTH-3 versions (Camacho et al 2000(Camacho et al , 2002(Camacho et al , 2011b(Camacho et al , 2021a and was applied in structural studies in several regions (e.g., ).…”

Section: Methods Applied To Interpret the Tenerife 2004-2005 Gravity ...mentioning

confidence: 99%

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Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

2022

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We review the current geoscientific knowledge of the volcanic unrest of 2004–2005 on Tenerife (Canary Islands) and revisit its gravimetric imprint. We revise the interpretation of the observed spatiotemporal (time-lapse) gravity changes accompanying the unrest by applying the Growth inversion approach based on model exploration and free geometry growing source bodies. We interpret the Growth solution, our new gravimetric model of the unrest, in the context of structural controls and the existing volcanological and geological knowledge of the central volcanic complex (CVC) of the island. Structural controls are inferred from the updated structural subsurface CVC density model obtained by our new Growth inversion of the available complete Bouguer anomalies (CBA data). Our gravimetric picture sees the unrest as a failed eruption, due to a stalled magma intrusion in the central position below the Teide–Pico Viejo stratocones, followed by upward and lateral migration of volcanic fluids reaching the aquifer and the SW end of the caldera wall. We thus classify the volcanic unrest of 2004–2005 as hybrid, in agreement with previous studies. The Growth inversion indicates that magma propagated along the boundary between the basaltic core of the island, the Boca Tauce volcanic body and the more permeable (less compacted) volcanic rocks with lower density. This gravimetric picture of the unrest provides new insights into the potential future reactivation of the volcanic system. Article Highlights Current geoscientific knowledge of the Tenerife volcanic unrest of 2004–2005 is reviewed New insights into the unrest are yielded by Growth inversion of observed time-lapse gravity changes Role of the freely adjustable inversion parameters in the Growth methodology is demonstrated Pros and cons of the Growth inversion approach in volcano gravimetric applications are illustrated

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Section: Methods Applied To Interpret the Tenerife 2004-2005 Gravity ...mentioning

confidence: 99%

Section: Methods Applied To Interpret the Tenerife 2004-2005 Gravity ...mentioning

confidence: 99%

Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

2022

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“…To invert the residual gravity changes at benchmarks, we apply a "Growth" inversion approach (Camacho et al, 2011(Camacho et al, , 2021a, modified to working with sparse micro-gravity changes of low signal-to-noise ratio (Camacho et al, 2021b, Vajda et al, 2021, which makes no a priori assumptions about the source geometry. The application of the "Growth-dg" inversion tool enables to obtain, in a nearly automatic and non-subjective mode, a 3D model of subsurface temporal density changes given by means of aggregation of parallelepiped cells.…”

Section: Growth Inversion Of Residual Gravity Changesmentioning

confidence: 99%

Interpretation of spatiotemporal gravity changes accompanying the earthquake of 21 August 2017 on Ischia (Italy)

Berrino

Vajda

Zahorec

et al. 2021

Contrib. Geophys. Geod.

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We analyse spatiotemporal gravity changes observed on the Ischia island (Italy) accompanying the destructive earthquake of 21 August 2017. The 29 May 2016 to 22 September 2017 time-lapse gravity changes observed at 18 benchmarks of the Ischia gravimetric network are first corrected for the gravitational effect of the surface deformation using the deformation-induced topographic effect (DITE) correction. The co-seismic DITE is computed by Newtonian volumetric integration using the Toposk software, a high-resolution LiDAR DEM and the co-seismic vertical displacement field derived from Sentinel-1 InSAR data. We compare numerically the DITE field with its commonly used Bouguer approximation over the island of Ischia with the outcome that the Bouguer approximation of DITE is adequate and accurate in this case. The residual gravity changes are then computed at gravity benchmarks by correcting the observed gravity changes for the planar Bouguer effect of the elevation changes at benchmarks over the same period. The residual gravity changes are then inverted using an inversion approach based on model exploration and growing source bodies, making use of the Growth-dg inversion tool. The found inversion model, given as subsurface time-lapse density changes, is then interpreted as mainly due to a co-seismic or post-seismic disturbance of the hydrothermal system of the island. Pros and weak points of such interpretation are discussed.

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“…Camacho et al 34 updated a methodology, software (named Growth) to carry out a nearly automatic 3D inversion of CBA gravity data in the context of structural studies. It can provide, without specific assumptions, anomalous density models suitable for different environments, including effects for general downward density increase.…”

Section: Introductionmentioning

confidence: 99%

A free-geometry geodynamic modelling of surface gravity changes using Growth-dg software

Camacho

Vajda

Miller

et al. 2021

Sci Rep

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Globally there is abundant terrestrial surface gravity data used to study the time variation of gravity related to subsurface mass and density changes in different geological, geodynamical and geotechnical environments. We present here a tool for analysing existing and newly acquired, 4D gravity data, which creates new findings from its reuse. Our method calculates in an almost automatic way the possible sources of density change responsible for the observed gravity variations. The specifics of the new methodology are: use of a low number of observation points, relatively small source structures, low signal/noise ratio in the data, and a free 3D source geometry without initial hypothesis. The process is based on the non-linear adjustment of structures defined by aggregation of small cells corresponding to a 3D section of the sub-floor volume. This methodology is implemented in a software tool, named GROWTH-dg, which can be freely downloaded for immediate use, together with a user manual and application examples.

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Upgraded software for structural gravity inversion and application to El Hierro (Canary Islands)

Cited by 15 publications

References 68 publications

Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

Benefits and Limitations of the Growth Inversion Approach in Volcano Gravimetry Demonstrated on the Revisited 2004–2005 Tenerife Unrest

Interpretation of spatiotemporal gravity changes accompanying the earthquake of 21 August 2017 on Ischia (Italy)

A free-geometry geodynamic modelling of surface gravity changes using Growth-dg software

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