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  • 1
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    Pressure, tilt, temperature and conductivity monitoring within the Immerged Santorini Caldera during Jul 2012 - Sep 2013
    PANGAEA
    In:  Supplement to: Vilaseca, Géraud; Deplus, Christine; Escartín, Javier; Ballu, Valérie; Nomikou, Paraskevi; Mével, Catherine; Andreani, Muriel (2016): Oceanographic Signatures and Pressure Monitoring of Seafloor Vertical Deformation in Near-coastal, Shallow Water Areas: A Case Study from Santorini Caldera. Marine Geodesy, 39(6), 401-421, https://doi.org/10.1080/01490419.2016.1226222
    Details
    Publication Date: 2023-05-12
    Description: Bottom pressure, tilt, and seawater physical properties were monitored for a year using two instruments within the immerged Santorini caldera (Greece). Piggybacked on the CALDERA2012 cruise, this geodetic experiment was designed to monitor evolution of the 2011-2012 Santorini unrest. Conducted during a quiescent period, it allowed us to study oceanographic and atmospheric signal in our data series. We observe periodic oceanographic signals associated with tides and seiches that are likely linked to both the caldera and Cretan Basin geometries. In winter, the caldera witnesses sudden cooling events that tilt an instrument towards the Southeast, indicating cold water influx likely originating from a passage into the caldera between Thirasia island and the northern end of Thera island to the northwest. We did not obtain evidence of long-term vertical seafloor deformation from the pressure signal, although it may be masked by instrumental drift. However, tilt data suggest a local seafloor tilt event ~1/year after the end of the unrest period, which could be consistent with inflation under or near Nea Kameni. Seafloor geodetic data recorded at the bottom of the Santorini caldera illustrate that the oceanographic signature is an important part of the signal, which needs to be considered for monitoring volcanic or geological seafloor deformation in shallow water and/or nearshore areas.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Seafloor monitoring data (Jul 2012-Sep 2013) within Santorini Caldera recorded by JPP temperature sensor
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: CALDERA2012; DATE/TIME; DEPTH, water; PRES-R; Pressure recorder; Pt-100 temperature sensor, Hydronaut; Santorini_Caldera_JPP; Santorini caldera seafloor, Greece; Temperature, technical; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 114218 data points
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    DATA PANGAEA
  • 3
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    Seafloor monitoring data (Jul 2012-Sep 2013) within Santorini Caldera recorded by JPP pressure sensor
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Calculated from pressure; CALDERA2012; DATE/TIME; DEPTH, water; PRES-R; Pressure, water; Pressure gauge, Paroscientific; Pressure recorder; Santorini_Caldera_JPP; Santorini caldera seafloor, Greece; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 2416984 data points
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    DATA PANGAEA
  • 4
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    Seafloor monitoring data (Jul 2012-Sep 2013) within Santorini Caldera recorded by SBE package of sensors
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Calculated from pressure; CALDERA2012; Conductivity; CTD, SEA-BIRD SBE 37-SMP MicroCAT; DATE/TIME; DEPTH, water; Pressure, water; Santorini_Caldera_SBE; Santorini caldera seafloor, Greece; Temperature, water; Temperature recorder; TEMP-R
    Type: Dataset
    Format: text/tab-separated-values, 395727 data points
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    DATA PANGAEA
  • 5
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    Seafloor monitoring data (Jul 2012-Sep 2013) within Santorini Caldera recorded by JPP tilt sensor
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: CALDERA2012; Clinometer, MD900-T, Applied Geomechanics; DATE/TIME; PRES-R; Pressure recorder; Santorini_Caldera_JPP; Santorini caldera seafloor, Greece; Temperature, technical; Tilt angle, X; Tilt angle, Y
    Type: Dataset
    Format: text/tab-separated-values, 3628002 data points
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    DATA PANGAEA
  • 6
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    Drilling constraints on lithospheric accretion and evolution at Atlantis Massif, Mid-Atlantic Ridge 30°N (2011)
    American Geophysical Union
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 116 (2011): B07103, doi:10.1029/2010JB007931.
    Description: Expeditions 304 and 305 of the Integrated Ocean Drilling Program cored and logged a 1.4 km section of the domal core of Atlantis Massif. Postdrilling research results summarized here constrain the structure and lithology of the Central Dome of this oceanic core complex. The dominantly gabbroic sequence recovered contrasts with predrilling predictions; application of the ground truth in subsequent geophysical processing has produced self-consistent models for the Central Dome. The presence of many thin interfingered petrologic units indicates that the intrusions forming the domal core were emplaced over a minimum of 100–220 kyr, and not as a single magma pulse. Isotopic and mineralogical alteration is intense in the upper 100 m but decreases in intensity with depth. Below 800 m, alteration is restricted to narrow zones surrounding faults, veins, igneous contacts, and to an interval of locally intense serpentinization in olivine-rich troctolite. Hydration of the lithosphere occurred over the complete range of temperature conditions from granulite to zeolite facies, but was predominantly in the amphibolite and greenschist range. Deformation of the sequence was remarkably localized, despite paleomagnetic indications that the dome has undergone at least 45° rotation, presumably during unroofing via detachment faulting. Both the deformation pattern and the lithology contrast with what is known from seafloor studies on the adjacent Southern Ridge of the massif. There, the detachment capping the domal core deformed a 100 m thick zone and serpentinized peridotite comprises ∼70% of recovered samples. We develop a working model of the evolution of Atlantis Massif over the past 2 Myr, outlining several stages that could explain the observed similarities and differences between the Central Dome and the Southern Ridge.
    Keywords: Atlantis Massif ; Integrated Ocean Drilling Program ; Oceanic Core Complex
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 7
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    The Kallisti Limnes, carbon dioxide-accumulating subsea pools (2015)
    Nature Publishing Group
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scientific Reports 5 (2015): 12152, doi:10.1038/srep12152.
    Description: Natural CO2 releases from shallow marine hydrothermal vents are assumed to mix into the water column, and not accumulate into stratified seafloor pools. We present newly discovered shallow subsea pools located within the Santorini volcanic caldera of the Southern Aegean Sea, Greece, that accumulate CO2 emissions from geologic reservoirs. This type of hydrothermal seafloor pool, containing highly concentrated CO2, provides direct evidence of shallow benthic CO2 accumulations originating from sub-seafloor releases. Samples taken from within these acidic pools are devoid of calcifying organisms, and channel structures among the pools indicate gravity driven flow, suggesting that seafloor release of CO2 at this site may preferentially impact benthic ecosystems. These naturally occurring seafloor pools may provide a diagnostic indicator of incipient volcanic activity and can serve as an analog for studying CO2 leakage and benthic accumulations from subsea carbon capture and storage sites.
    Description: This research was supported by the Eurofleets Caldera 2012 Project (EU), a NASA Astrobiology Science & Technology for Exploring Planets grant #NNX09AB76G (USA), a CAREER Award grant #OCE-0955674 to R. Camilli from the National Science Foundation (USA), and IPGP (France).
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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    PAPER (OA)
  • 8
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    Carbonation of serpentinite in creeping faults of California (2023)
    American Geophysical Union
    Details
    Publication Date: 2023-02-21
    Description: Author Posting. © American Geophysical Union, 2022. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 49(15), (2022): e2022GL099185, https://doi.org/10.1029/2022gl099185.
    Description: Several large strike slip faults in central and northern California accommodate plate motions through aseismic creep. Although there is no consensus regarding the underlying cause of aseismic creep, aqueous fluids and mechanically weak, velocity-strengthening minerals appear to play a central role. This study integrates field observations and thermodynamic modeling to examine possible relationships between the occurrence of serpentinite, silica-carbonate rock, and CO2-rich aqueous fluids in creeping faults of California. Our models predict that carbonation of serpentinite leads to the formation of talc and magnesite, followed by silica-carbonate rock. While abundant exposures of silica-carbonate rock indicate complete carbonation, serpentinite-hosted CO2-rich spring fluids are strongly supersaturated with talc at elevated temperatures. Hence, carbonation of serpentinite is likely ongoing in parts of the San Andres Fault system and operates in conjunction with other modes of talc formation that may further enhance the potential for aseismic creep, thereby limiting the potential for large earthquakes.
    Description: This work was supported by National Science Foundation (NSF) grants NSF-EAR-1220280 to F. K. and J. L., NSF-EAR-1219908 to D. G., and NSF-OCE-2001728 to J. L.
    Keywords: Mineral carbonation ; Serpentinite ; Talc ; CO2 ; Aseismic creep ; San Andreas Fault
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 9
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    First direct observation of coseismic slip and seafloor rupture along a submarine normal fault and implications for fault slip history (2016)
    Elsevier
    In:  Earth and Planetary Science Letters, 450 . pp. 96-107.
    Details
    Publication Date: 2019-02-01
    Description: Highlights • Coseismic displacement documented and measured in a submarine fault following a 2004 Mw 6.3 event. • Coseismic deformation of hanging wall with cracking and fissuring of seafloor sediments. • High-resolution mapping, photomosaicing, and 3D video-derived terrain models to constrain earthquake rupture at seafloor. Abstract Properly assessing the extent and magnitude of fault ruptures associated with large earthquakes is critical for understanding fault behavior and associated hazard. Submarine faults can trigger tsunamis, whose characteristics are defined by the geometry of seafloor displacement, studied primarily through indirect observations (e.g., seismic event parameters, seismic profiles, shipboard bathymetry, coring) rather than direct ones. Using deep-sea vehicles, we identify for the first time a marker of coseismic slip on a submarine fault plane along the Roseau Fault (Lesser Antilles), and measure its vertical displacement of ∼0.9 m in situ. We also map recent fissuring and faulting of sediments on the hangingwall, along ∼3 km of rupture in close proximity to the fault's base, and document the reactivation of erosion and sedimentation within and downslope of the scarp. These deformation structures were caused by the 2004 Mw 6.3 Les Saintes earthquake, which triggered a subsequent tsunami. Their characterization informs estimates of earthquake recurrence on this fault and provides new constraints on the geometry of fault rupture, which is both shorter and displays locally larger coseismic displacements than available model predictions that lack field constraints. This methodology of detailed field observations coupled with near-bottom geophysical surveying can be readily applied to numerous submarine fault systems, and should prove useful in evaluating seismic and tsunamigenic hazard in all geodynamic contexts.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    DOI: 10.1016/j.epsl.2016.06.024
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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