Backarc tectonism, volcanism, and mass wasting shape seafloor morphology in the Santorini-Christiana-Amorgos region of the Hellenic Volcanic Arc

Hooft, E. E.; Nomikou, Paraskevi; Toomey, D. R.; Lampridou, Danai; Getz, Claire; Christopoulou, M. E.; O’Hara, Daniel; Arnoux, G. M.; Bodmer, Miles; Gray, Melissa; Heath, Benjamin; VanderBeek, Brandon

doi:10.1016/j.tecto.2017.06.005

Cited by 61 publications

(79 citation statements)

References 80 publications

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“…We postulate that past collapse mechanisms at Santorini influence magma focusing between eruptive cycles, an actively self-organized feedback process that may be important in other volcanoes. (Hooft et al, 2017) and the layout of the entire marine-land dataset that was collected in November-December of 2015. The dense seismic experiment recorded ~14,300 controlled-sound sources (beige dots) from the R/V Marcus Langseth on 90 ocean-bottom and 65 land seismometers (yellow circles).…”

Section: Discussionmentioning

confidence: 99%

Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge

Hooft

Heath

Toomey

et al. 2019

Earth and Planetary Science Letters

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Highlights: (3-5 bullets, 85 characters max) 1. There is a shallow low-velocity, high-porosity volume in the north-central caldera 2. Vents of the first 3 LBA eruption phases correlate with this inner structure 3. Inner collapse involved reverse faults, volcanic deposits, and/or rock fractures 4. The low-density volume may have caused 2011-2012 inflation to localize beneath it 5. The outer topographic caldera formed by relatively coherent down drop *Manuscript Click here to view linked References

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Section: Discussionmentioning

confidence: 99%

Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge

Hooft

Heath

Toomey

et al. 2019

Earth and Planetary Science Letters

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“…Velocity anomalies relative to the 1‐D average velocity‐depth profile at 0‐, 1‐, 2‐, and 3‐km depth. Background is illuminated bathymetric map from Hooft et al (). Grey lines are faults defined using the seismic tomography images.…”

Section: Data Processing and Tomographic Inversionmentioning

confidence: 99%

“…These exhumed rocks compose most of the regional islands (e.g., Ios, Amorgos; Lister et al, ; Forster & Lister, ), including a portion of SW Santorini itself (Heiken & Mccoy, ). Moreover, these metamorphic fault blocks often extend as horsts into the Aegean Sea, as seen in seafloor bathymetry and seismic reflection profile images (Hooft et al, ; Hübscher et al, ; Nomikou et al, , ; Perissoratis, ). Metamorphic basement lithics, found in the erupted ignimbrite products from Santorini, reveal that the metamorphic complex must underlie Santorini's caldera (Druitt, ), and it is thought that Santorini sits on a NE‐SW oriented fracture network (Budetta et al, ).…”

Section: Introductionmentioning

confidence: 99%

Tectonism and Its Relation to Magmatism Around Santorini Volcano From Upper Crustal P Wave Velocity

et al. 2019

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At extensional volcanic arcs, faulting often acts to localize magmatism. Santorini is located on the extended continental crust of the Aegean microplate and is one of the most active volcanoes of the Hellenic arc, but the relationship between tectonism and magmatism remains poorly constrained. As part of the Plumbing Reservoirs Of The Earth Under Santorini experiment, seismic data were acquired across the Santorini caldera and the surrounding region using a dense amphibious array of >14,300 marine sound sources and 156 short-period seismometers, covering an area 120 km by 45 km. Here a P wave velocity model of the shallow, upper-crustal structure (<3-km depth), obtained using travel time tomography, is used to delineate fault zones, sedimentary basins, and tectono-magmatic lineaments. Our interpretation of tectonic boundaries and regional faults are consistent with prior geophysical studies, including the location of basin margins and E-W oriented basement faults within the Christiana Basin west of Santorini. Reduced seismic velocities within the basement east of Santorini, near the Anydros and Anafi Basins, are coincident with a region of extensive NE-SW faulting and active seismicity. The structural differences between the eastern and western sides of Santorini are in agreement with previously proposed models of regional tectonic evolution. Additionally, we find that regional magmatism has been localized in NE-SW trending basin-like structures that connect the Christiana, Santorini, and Kolumbo volcanic centers. At Santorini itself, we find that magmatism has been localized along NE-SW trending lineaments that are subparallel to dikes, active faults, and regional volcanic chains. These results show strong interaction between magmatism and active deformation.

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“…Furthermore, bathymetric data were acquired on-board the R/V Marcus Langseth's using the Simrad Kongsberg EM122 12kHz multibeam echo sounder, in 2015 (Hooft et al, 2017). Data were processed using the MB-SYSTEM open-source software and merged with pre-existing data (Nomikou et al, 2013(Nomikou et al, , 2012.…”

Section: Bathymetric Datamentioning

confidence: 99%

Developing a Strategy for Precise 3d Modelling of Large-Scale Scenes for Vr

Saer¹,

Stentoumis²,

Kalisperakis³

et al. 2020

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. In this work, we present a methodology for precise 3D modelling and multi-source geospatial data blending for the purposes of Virtual Reality immersive and interactive experiences. We evaluate it on the volcanic island of Santorini due to its formidable geological terrain and the interest it poses for scientific and touristic purposes. The methodology developed here consists of three main steps. Initially, bathymetric and SRTM data are scaled down to match the smallest resolution of our dataset (LIDAR). Afterwards, the resulted elevations are combined based on the slope of the relief, while considering a buffer area to enforce a smoother terrain. As a final step, the orthophotos are combined with the estimated Digital Terrain Model, via applying a nearest neighbour matching schema leading to the final terrain background. In addition to this, both onshore and offshore points-of-interest were modelled via image-based 3D reconstruction and added to the virtual scene. The overall geospatial data that need to be visualized in applications demanding photo-textured hyper-realistic models pose a significant challenge. The 3D models are treated via a mesh optimization workflow, suitable for efficient and fast visualization in virtual reality engines, through mesh simplification, physically based rendering texture maps baking, and level-of-details.

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Backarc tectonism, volcanism, and mass wasting shape seafloor morphology in the Santorini-Christiana-Amorgos region of the Hellenic Volcanic Arc

Cited by 61 publications

References 80 publications

Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge

Seismic imaging of Santorini: Subsurface constraints on caldera collapse and present-day magma recharge

Tectonism and Its Relation to Magmatism Around Santorini Volcano From Upper Crustal P Wave Velocity

Developing a Strategy for Precise 3d Modelling of Large-Scale Scenes for Vr

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