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  • 2020-2022  (26)
  • 2015-2019  (71)
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  • 1
    Online Resource
    Online Resource
    RV MARIA S. MERIAN Fahrtbericht / Cruise Report MSM71 LOBSTER: Ligurian Ocean Bottom Seismology and Tectonics Research : Las Palmas (Spain) – Heraklion (Greece) 07.02.-27.02.2017 (2018)
    Kiel : GEOMAR Helmholtz Centre for Ocean Research Kiel
    Details Availability
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (47 Seiten)
    Series Statement: GEOMAR Report N. Ser. 41
    URL: http://oceanrep.geomar.de/42339/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
    Location Call Number Limitation Availability
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    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 2
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    A seismic refraction and wide-angle reflection profile M111 - DY-05 during METEOR cruise M111 in the Ionian Sea, with links to SGY data files (2019)
    PANGAEA
    In:  Supplement to: Dannowski, Anke; Kopp, Heidrun; Klingelhöfer, Frauke; Klaeschen, Dirk; Gutscher, Marc-Andre; Krabbenhöft, Anne; Dellong, David; Rovere, Marzia; Graindorge, David; Papenberg, Cord; Klaucke, Ingo (2019): Ionian Abyssal Plain: a window into the Tethys oceanic lithosphere. Solid Earth, 10(2), 447-462, https://doi.org/10.5194/se-10-447-2019
    Details
    Publication Date: 2023-03-03
    Description: During RV Meteor cruise M111 refraction and wide-angle reflection seismic data were acquired. We present eight seismic record sections (.sgy format) of the hydrophone components from four ocean bottom hydrophones (OBH501, OBH503, OBH505, OBH507) and four ocean bottom seismometers (OBS502, OBS504, OBS506, OBS508) along the NNE-SSW oriented seismic profile DY-05, which is situated in the Ionian Abyssal Plain. The profile stretches over a distance of 131 km and was shot using an airgun array of six G-gun clusters with a total volume of 84 l (5440 cu in) at 210 bar. A total of 946 shots were fired every 60 s (~140 m) with an airgun towed behind the vessel in a depth of 8 m. Data are unprocessed, however, they are corrected for instrument drift along the profile using the symmetry of the direct arrival and the data are time corrected.
    Keywords: Eastern Basin; Event label; File content; File format; File name; File size; Ionian Abyssal Plain; Latitude of event; Longitude of event; M111; M111_1202-1; M111_1203-1; M111_1204-1; M111_1205-1; M111_1206-1; M111_1207-1; M111_1208-1; M111_1209-1; Mediterranean; Meteor (1986); OBH; OBH501; OBH503; OBH505; OBH507; OBS; OBS502; OBS504; OBS506; OBS508; Ocean bottom hydrophone; Ocean bottom seismometer; Seismic refraction data; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 40 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Raw multibeam EM122 data: transits of Maria S. Merian cruise MSM71 (Mediterranean) (2018)
    PANGAEA
    Details
    Publication Date: 2024-02-27
    Keywords: AtlantOS; Bathymetry; DATE/TIME; EM122; EM122 multibeam echosounder; File format; File name; File size; LATITUDE; LONGITUDE; Maria S. Merian; MSM71; MSM71_0_underway-2; Optimizing and Enhancing the Integrated Atlantic Ocean Observing System; Swath-mapping system Simrad EM122 (Kongsberg Maritime AS); Uniform resource locator/link to raw data file; Western Basin
    Type: Dataset
    Format: text/tab-separated-values, 1012 data points
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    DATA PANGAEA
  • 4
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    2D multichannel seismic reflection data at TAG hydrothermal field during METEOR cruise M127 with links to sgy data files (2019)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2024-06-10
    Description: 2D seismic profiling was acquired at TAG hydrothermal filed, Mid-Atlantic Ridge during cruise M127 of R/V METEOR. Data were acquired using a 192 channel streamer (group offset 1.52 m). Source signal generation was provided by a 105/105 cinch GI gun or a 380/380 cinch G-gun cluster. Purpose of the cruise was the imaging of mound structures for the benefit of imaging seafloor massive sulfide structures.
    Keywords: BlueMining; Breakthrough Solutions for Mineral Extraction and Processing in Extreme Environment – Blue Mining; File format; File name; File size; hydrothermal vents; LATITUDE; Latitude 2; LONGITUDE; Longitude 2; M127; M127_MCS_TAG; Meteor (1986); Profile ID; seafloor massive sulfides; seismic data; Seismic reflection profile; SEISREFL; TAG; TAG_field; TAG Hydrothermal Field; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 308 data points
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    DATA PANGAEA
  • 5
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    Arrival angles of teleseismic fundamental mode Rayleigh waves across the the AlpArray (2019)
    Details
    Publication Date: 2020-11-30
    Description: The dense AlpArray network allows studying seismic wave propagation with high spatial resolution. Here we introduce an array approach to measure arrival angles of teleseismic Rayleigh waves. The approach combines the advantages of phase correlation as in the two-station method with array beamforming to obtain the phase-velocity vector. 20 earthquakes from the first two years of the AlpArray project are selected, and spatial patterns of arrival-angle deviations across the AlpArray are shown in maps, depending on period and earthquake location. The cause of these intriguing spatial patterns is discussed. A simple wave-propagation modelling example using an isolated anomaly and a Gaussian beam solution suggests that much of the complexity can be explained as a result of wave interference after passing a structural anomaly along the wave paths. This indicates that arrival-angle information constitutes useful additional information on the Earth structure, beyond what is currently used in inversions.
    Description: Published
    Description: 115–144
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    PAPER (OA)
  • 6
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    Reply to Comment by A. Argnani on “Geometry of the Deep Calabrian Subduction From Wide‐Angle Seismic Data and 3‐D Gravity Modeling” (2021)
    Wiley Agu
    Details
    Publication Date: 2021-01-19
    Description: Reply to Argnani, A. (2020). Comment on“Geometry of the deep Calabriansubduction (Central MediterraneanSea) from wide-angle seismic data and3-D gravity modeling” by Dellong et al.Geochemistry, Geophysics, Geosyste ms,21, e2020GC009077, https://doi.org/10.1029/2020GC009077
    Description: Andrea Argnani in his comment on Dellong et al. (2020, https://doi.org/10.1029/2019gc008586) (Geometry of the deep Calabrian subduction (Central Mediterranean Sea) from wide‐angle seismic data and 3‐D gravity modeling) proposes an alternate interpretation of the wide‐angle seismic velocity models presented by Dellong et al. (2018, https://doi.org/10.1002/2017JB015312) and Dellong et al. (2020) and proposes a correction of the literature citations in these paper. In this reply, we discuss in detail all points raised by Andrea Argnani.
    Description: Published
    Description: e2020GC009223
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 7
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    Geometry of the deep Calabrian subduction (Central Mediterranean Sea) from wide‐angle seismic data and 3‐D gravity modeling (2019)
    Agu
    Details
    Publication Date: 2020-05-07
    Description: The Calabrian subduction zone is one of the narrowest arcs on Earth and a key area to understand the geodynamic evolution of the Mediterranean and other marginal seas. Here in the Ionian Sea, the African plate subducts beneath Eurasia. Imaging the boundary between the downgoing slab and the upper plate along the Calabrian subduction zone is important for assessing the potential of the subduction zone to generate mega‐thrust earthquakes and was the main objective of this study. Here we present and analyze the results from a 380 km long, wide‐angle seismic profile spanning the complete subduction zone, from the deep Ionian Basin and the accretionary wedge to NE Sicily, with additional constraints offered by 3‐D Gravity modeling and the analysis of earthquake hypocenters. The velocity model for the wide‐angle seismic profile images thin oceanic crust throughout the basin.
    Description: Published
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: subduction ; wide angle seismic data ; 04. Solid Earth
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    The contribution of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) to “Adria LithosPHere investigAtion (ALPHA)” active seismic experiment (2019)
    Details
    Publication Date: 2019-03-27
    Description: During the winter 2012, from 20 January to 4 February, the German oceanographic FS METEOR cruise (M86/3) took place in the central-southern Adriatic Sea in the frame of “Adria LithosPHere InvestigAtion” (ALPHA [Kopp et al., 2013]). The primary goal of the project was high-resolution tomographic imaging of the crust and lithospheric mantle underneath the southern Adriatic Sea, the Apulia eastern margin and the external zone of the Dinaric thrust-belt by collecting offshore-onshore seismic data along three multi-fold wide-aperture profiles. The definition of reliable velocity models of the Adriatic lithosphere was considered crucial for a better understanding of the structure, fragmentation, geodynamic evolution, and seismotectonics of the Adria-Apulia microplates. The ALPHA Project was coordinated by Helmholtz Centre for Ocean Research Kiel, Germany (GEOMAR), former Leibniz Institute of Marine Sciences (German: Leibniz-Institut für Meereswissenschaften, IFM-GEOMAR) and conducted in close cooperation with different European institutions of Germany, Albania, Croatia, Italy and Montenegro. The Istituto Nazionale di Geofisica Vulcanologia (INGV) participated by deploying land stations along two transects in the Apulia and Gargano Promontory to extend westwards the seismic profiles. The primary goal was to record shallow-to-deep seismic phases travelling along the transition between the Adriatic basin and the Apulia foreland. In this paper we present the field work related to the two Italian onshore transects, the recorded data, and the processing flow developed to highlight crustal and mantle refractions and wide-angle reflections.
    Description: Published
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: active seismic experiment ; temporary seismic network ; deep structure ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Polyphase Magmatism During the Formation of the Northern East Greenland Continental Margin (2019)
    In:  EPIC3Tectonics, 38, pp. 2961-2982
    Details
    Publication Date: 2019-11-06
    Description: New marine geophysical data acquired across the partly ice‐covered northern East Greenland continental margin highlight a complex interaction between tectonic and magmatic events. Breakup‐related lava flows are imaged in reflection seismic data as seaward dipping reflectors, which are found to decrease in size both northward and southward from a central point at 75°N. We provide evidence that the magnetic anomaly pattern in the shelf area is related to volcanic phases and not to the presence of oceanic crust. The remnant magnetization of the individual lava flows is used to deduce a relative timing of the emplacement of the volcanic wedges. We find that the seaward dipping reflectors have been emplaced over a period of 2–4 Ma progressively from north to south and from landward to seaward. The new data indicate a major post‐middle Eocene magmatic phase around the landward termination of the West Jan Mayen Fracture Zone. This post‐40‐Ma volcanism likely was associated with the progressive separation of the Jan Mayen microcontinent from East Greenland. The breakup of the Greenland Sea started at several isolated seafloor spreading cells whose location was controlled by rift structures and led to the present‐day segmentation of the margin. The original rift basins were subsequently connected by steady‐state seafloor spreading that propagated southward, from the Greenland Fracture Zone to the Jan Mayen Fracture Zone.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 10
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    Seismic structure and segmentation of the axial valley of the Mid-Cayman Spreading Center (2017)
    AGU (American Geophysical Union) | Wiley
    In:  Geochemistry, Geophysics, Geosystems, 18 (6). pp. 2149-2161.
    Details
    Publication Date: 2020-02-06
    Description: We report the results of a two-dimensional tomographic inversion of marine seismic refraction data from an array of ocean-bottom seismographs (OBSs), which produced an image of the crustal structure along the axial valley of the ultraslow spreading Mid-Cayman Spreading Center (MCSC). The seismic velocity model shows variations in the thickness and properties of the young oceanic crust that are consistent with the existence of two magmatic-tectonic segments along the 110 km long spreading center. Seismic wave speeds are consistent with exhumed mantle at the boundary between these two segments, but changes in the vertical gradient of seismic velocity suggest that volcanic crust occupies most of the axial valley seafloor along the seismic transect. The two spreading segments both have a low-velocity zone (LVZ) several kilometers beneath the seafloor, which may indicate the presence of shallow melt. However, the northern segment also has low seismic velocities (3 km/s) in a thick upper crustal layer (1.5–2.0 km), which we interpret as an extrusive volcanic section with high porosity and permeability. This segment hosts the Beebe vent field, the deepest known high-temperature black smoker hydrothermal vent system. In contrast, the southern spreading segment has seismic velocities as high as 4.0 km/s near the seafloor. We suggest that the porosity and permeability of the volcanic crust in the southern segment are much lower, thus limiting deep seawater penetration and hydrothermal recharge. This may explain why no hydrothermal vent system has been found in the southern half of the MCSC.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2017GC006873
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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