3-D digital outcrop model for analysis of brittle deformation and lithological mapping (Lorette cave, Belgium)

Triantafyllou, Antoine; Watlet, Arnaud; Mouélic, S. Le; Camelbeeck, Thierry; Civet, François; Kaufmann, O.; Quinif, Yves; Vandycke, Sara

doi:10.1016/j.jsg.2019.01.001

Cited by 41 publications

(21 citation statements)

References 51 publications

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“…In addition, forensic analysis of the paintings was conducted using a photogrammetric study performed with photos of the Cumberland Bay area taken with a conventional digital camera and processed with Agisoft Photoscan Professional software (v. 1.3.1; www.agisoft.com), one of the most widely used in the community of Earth sciences (e.g. Tavani et al, 2014; Triantafyllou et al, 2019; Verhoeven, 2011). This approach is based on the Structure from Motion (SfM) technique, which relies on the projection of tie-points recognised across a set of overlapping images taken from different points of view.…”

Section: Methodsmentioning

confidence: 99%

The AD1835 eruption at Robinson Crusoe Island discredited: Geological and historical evidence

Lara

Jeria

Valdivia

et al. 2020

Progress in Physical Geography: Earth and Environment

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A submarine eruption in Cumberland Bay, Robinson Crusoe Island, was reported by Thomas Sutcliffe, the former British Governor, shortly after the earthquake that struck the coast of Chile on 20 February 1835. This episode was described by Charles Darwin in his Voyage of the Beagle and extensive mention has been made since then, especially stimulated by a renowned painting by J.M. Rugendas. Because of the apparent causal relation, this event has also been widely cited as an example of remote tectonically triggered eruption. However, there are inconsistencies that pose doubts about the actual occurrence of an eruption. Here we present evidence against the hypothetical eruption based on both the absence of any geological evidence and a reinterpretation of the historical accounts. We first observe that no bathymetric anomaly is present immediately below the place of the depicted ‘eruptive column’. We also note the absence of any deposit or recent volcano morphology and then unravel some incompatibility between the expected volcanological parameters and the featured column. In addition, we analyse the historical records and conclude that they are compatible with a tsunami entering the bay. By means of numerical simulations we further demonstrate that the accounts well match with the expected behaviour of a distant earthquake-triggered tsunami. We infer that some tsunami-related processes (sound waves, rockfalls, lightning) may have been misunderstood at that time. The latter corresponds to the current knowledge of natural processes but also could have been deliberatively amplified in Sutcliffe’s report. Our multidisciplinary approach provides full consistent geographical evidence of a fact that did not happen. This finding is relevant from the hazard’s perspective, but also for the science of earthquakes and eruptions, or the knowledge of processes that control the late secondary volcanism at oceanic islands and seamounts.

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Section: Methodsmentioning

confidence: 99%

The AD1835 eruption at Robinson Crusoe Island discredited: Geological and historical evidence

Lara

Jeria

Valdivia

et al. 2020

Progress in Physical Geography: Earth and Environment

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“…Another example of photogrammetric reconstruction is presented in [26], using Agisoft PhotoScan Professional (recently renamed "Metashape") on descent images of the Apollo 15 landing site. In this work, we also relied on Agisoft Metashape (v. 1.6.2, [27]), which is one of the most widely used SfM solutions in the field of planetary science for geological applications (e.g., [3,[5][6][7]11,12]).…”

Section: Structure From Motion Principle and Software Choicementioning

confidence: 99%

“…It can be coupled with the possibility of reconstructing high-resolution 3-D data sets, such as digital outcrop models (DOMs), from a set of overlapping photographs using structure-from-motion photogrammetry (e.g., [2][3][4][5][6][7][8]). By doing so, VR enables geoscientists to complement, quantitatively evaluate, and analytically enhance field observations, and also to eventually perform analysis at multiple scales and optical manipulation, which is not directly possible in the field with conventional methods [9][10][11][12]. This is particularly important for remote locations that are not easily accessible, such as planets, moons, and small bodies of the solar system.…”

Section: Introductionmentioning

confidence: 99%

Investigating Lunar Boulders at the Apollo 17 Landing Site Using Photogrammetry and Virtual Reality

et al. 2020

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The Taurus-Littrow valley on the Moon was the location of intensive geologic fieldwork during three days in December 1972. In situ activities at sampling stations were systematically documented by the astronauts using a series of overlapping images taken with their Hasselblad cameras. We investigated how this Apollo image archive can be used to perform 3-D reconstructions of several boulders of interest using close-range photogrammetry. We specifically focused on seven different boulders located at Stations 2, 6, and 7, at the foot of South and North Massifs, respectively. These boulders represent samples from highland materials, which rolled down the slopes of the surrounding hills. We used the Agisoft Metashape software to compute 3-D reconstructions of these boulders, using 173 scanned images as input. We then used either a web-based platform or a game engine to render the models in virtual reality. This allowed the users to walk around the boulders and to investigate in detail their morphology, fractures, vesicles, color variations, and sampling spots, as if standing directly in front of them with the astronauts. This work suggests that many features can be reconstructed in other sites of the Apollo missions, so as other robotic landing sites. Virtual reality techniques coupled to photogrammetry is thus opening a new era of exploration, both for past and future landing sites.

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“…Specifically, the structures that govern cave morphology provide data that is usually impossible to obtain via classical geologic mapping. Worldwide karst systems, large and small, have revealed important tectonic insights, as exemplified in the cases of young (alpine) orogens such as the Tatra Mts (Szczygieł 2015a), old Variscan massifs such as the Ardennes (Triantafyllou et al 2019), or those covered with dense vegetation preventing surface studies, such as the South China fold belt (Szczygieł et al 2018). Moreover, since the preservation of surface outcrops within mid-sized European mountains is far from perfect, caves appear to contain outcrops with a high level of potential for structural analysis.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, in caves, the geologist is surrounded by outcrops, making it possible, in fault-controlled systems, to follow fault planes for up to hundreds of meters (Szczygieł 2015a, b). Furthermore, stable conditions in caves preserve slickensides from long-term erosion effect, rendering them suitable for structural analysis (Szczygieł et al 2015;Triantafyllou et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif

Sobczyk

Szczygieł

2021

Int J Earth Sci (Geol Rundsch)

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Brittle structures identified within the largest karstic cave of the Sudetes (the Niedźwiedzia Cave) were studied to reconstruct the paleostress driving post-Variscan tectonic activity in the NE Bohemian Massif. Individual fault population datasets, including local strike and dip of fault planes, striations, and Riedel shear, enabled us to discuss the orientation of the principal stresses tensor. The (meso) fault-slip data analysis performed both with Dihedra and an inverse method revealed two possible main opposing compressional regimes: (1) NE–SW compression with the formation of strike-slip (transpressional) faults and (2) WNW–ESE horizontal compression related to fault-block tectonics. The (older) NE-SW compression was most probably associated with the Late Cretaceous–Paleogene pan-regional basin inversion throughout Central Europe, as a reaction to ongoing African-Iberian-European convergence. Second WNW–ESE compression was active as of the Middle Miocene, at the latest, and might represent the Neogene–Quaternary tectonic regime of the NE Bohemian Massif. Exposed fault plane surfaces in a dissolution-collapse marble cave system provided insights into the Meso-Cenozoic tectonic history of the Earth’s uppermost crust in Central Europe, and were also identified as important guiding structures controlling the origin of the Niedźwiedzia Cave and the evolution of subsequent karstic conduits during the Late Cenozoic.

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3-D digital outcrop model for analysis of brittle deformation and lithological mapping (Lorette cave, Belgium)

Cited by 41 publications

References 51 publications

The AD1835 eruption at Robinson Crusoe Island discredited: Geological and historical evidence

The AD1835 eruption at Robinson Crusoe Island discredited: Geological and historical evidence

Investigating Lunar Boulders at the Apollo 17 Landing Site Using Photogrammetry and Virtual Reality

Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif

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