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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 108 (1992), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Two high-amplitude reflections, or ‘bright spots’, occur on COCORP (Consortium for Continental Reflection Profiling) line Georgia 16 at a record time of 5.9 s, corresponding to nearly 16 km depth. They are significant because bright spots often mark great contrasts in subsurface physical properties. The first is the 'Surrency Bright Spot’(SBS), an exceptionally bright antiformal reflection, and the second is the‘Reedy Creek Reflection’(RCR), which lies 5 km to the south and resembles the south half of a diffraction. The RCR is also imaged on a crossline, Georgia 18, as a relatively symmetric antiformal reflection. These reflections coincide with the Brunswick magnetic anomaly, thought to mark the late Palaeozoic Alleghanian suture.The SBS and the RCR are reflections from bodies that lie within the plane of Georgia 16. Migration and 2-D seismic modelling show the aniformal SBS is from a synformal reflector with a buried focus while the RCR is from a relatively small body. The inferred geometry of the SBS reflector, with its flat portion corresponding to the deepest part of the reflector, argues that it does not represent fluids. These results, combined with recent evidence that the SBS is a reflection from a high-velocity thin layer, suggest that the SBS and the RCR might be reflections from ultramafic slices emplaced within the Alleghanian suture zone during collision or from mafic sheets intruded into the suture zone during subsequent rifting. The brightness of the SBS is attributed to a large impedance contrast, constructive interference, good data quality, and a relatively large reflector size with respect to the Fresnel zone and neighbouring reflectors.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2023-03-10
    Description: The dataset contains the raw .segy files of the ocean bottom seismometers/hydrophones (OBS/H) that recorded wide-angle seismic data along 6 profiles in the Porcupine Basin. The active-source seismic survey was conducted by GEOMAR in 2004. The cruise report, navigation files for each profile, and geographical coordinates of each OBS/H are also included in this dataset.
    Keywords: Event label; File format; File name; File size; M61/2; M61/2_348; M61/2_398-1; M61/2_447; M61/2_487-1; M61/2_494; M61/2_522; Meteor (1986); Profile1; Profile2-I; Profile3-I; Profile4-I; Profile5; Profile6; Seismic refraction profile; SEISREFR; South Atlantic Ocean; Uniform resource locator/link to metadata file; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 1981 data points
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  • 3
    Publication Date: 2024-01-13
    Description: Seismic data was acquired to study the transition from rifted continental crust to oceanic crust at the Deep Galicia Margin from June to August 2013. 3D Multichannel reflection and coincident wide-angle seismic data were acquired simultaneously as part of a seismic experiment over an area of 80 km long and 25 km wide in the Deep Galicia margin. The multichannel reflection seismic volume was acquired by the R/V Marcus G. Langseth, which provided a source for the ocean bottom seismic data. A total of 86 ocean bottom hydrophones/seismometer deployments were carried out by F/S Poseidon. Two airgun arrays with total gun volumes of 3,300 cu.in. were deployed as seismic sources. Shots were fired alternately using two source arrays every 37.5 m (shot interval of ~ 16 s with ship speed of 4.5 knots). Data were converted into SEGY format. Further details are available at https://doi.org/10.1038/NGEO2671.
    Keywords: Binary Object; Binary Object (File Size); Continental rifting; continent-ocean transition; Event label; Line; OBH; OBH 02; OBH 04; OBH 06; OBH 08; OBH 26; OBH 30; OBH 32; OBH 56; OBH 58; OBH 60; OBH 62; OBH 63; OBH 65; OBH 67; OBH 68; OBH 70; OBS; OBS 11; OBS 16; OBS 17; OBS 18; OBS 19; OBS 20; OBS 22; OBS 23; OBS 24; OBS 28; OBS 34; OBS 38; OBS 40; OBS 42; OBS 43; OBS 46; OBS 48; OBS 52; OBS 54; OBS 59; OBS 64; OBS 69; OBS 7; OBS 73; OBS 75; Ocean bottom hydrophone; Ocean bottom seismometer; POS453; POS453_724-1; POS453_729-1; POS453_731-1; POS453_734-1; POS453_736-1; POS453_738-1; POS453_740-1; POS453_742-1; POS453_746-1; POS453_748-1; POS453_751-1; POS453_752-1; POS453_754-1; POS453_755-1; POS453_757-1; POS453_763-1; POS453_766-1; POS453_768-1; POS453_773-1; POS453_774-1; POS453_775-1; POS453_776-1; POS453_779-1; POS453_780-1; POS453_781-1; POS453_791-1; POS453_792-1; POS453_793-1; POS453_794-1; POS453_795-1; POS453_796-1; POS453_797-1; POS453_798-1; POS453_799-1; POS453_820-1; POS453_821-1; POS453_822-1; POS453_823-1; POS453_824-1; POS453_825-1; POS453_826-1; Poseidon; Station label; Type; West Iberia; wide-angle seismic
    Type: Dataset
    Format: text/tab-separated-values, 54004 data points
    Location Call Number Expected Availability
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  • 4
    Publication Date: 2024-01-13
    Description: Seismic data was acquired to study the transition from rifted continental crust to oceanic crust at the Deep Galicia Margin from June to August 2013. 3D Multichannel reflection and coincident wide-angle seismic data were acquired simultaneously as part of a seismic experiment over an area of 80 km long and 25 km wide in the Deep Galicia margin. The multichannel reflection seismic volume was acquired by the R/V Marcus G. Langseth, which provided a source for the ocean bottom seismic data. A total of 86 ocean bottom hydrophones/seismometer deployments were carried out by F/S Poseidon. Two airgun arrays with total gun volumes of 3,300 cu.in. were deployed as seismic sources. Shots were fired alternately using two source arrays every 37.5 m (shot interval of ~ 16 s with ship speed of 4.5 knots). Data were converted into SEGY format. Further details are available at https://doi.org/10.1038/NGEO2671.
    Keywords: Continental rifting; continent-ocean transition; West Iberia; wide-angle seismic
    Type: Dataset
    Format: application/zip, 3 datasets
    Location Call Number Expected Availability
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  • 5
    Publication Date: 2024-01-13
    Description: Seismic data was acquired to study the transition from rifted continental crust to oceanic crust at the Deep Galicia Margin from June to August 2013. 3D Multichannel reflection and coincident wide-angle seismic data were acquired simultaneously as part of a seismic experiment over an area of 80 km long and 25 km wide in the Deep Galicia margin. The multichannel reflection seismic volume was acquired by the R/V Marcus G. Langseth, which provided a source for the ocean bottom seismic data. A total of 86 ocean bottom hydrophones/seismometer deployments were carried out by F/S Poseidon. Two airgun arrays with total gun volumes of 3,300 cu.in. were deployed as seismic sources. Shots were fired alternately using two source arrays every 37.5 m (shot interval of ~ 16 s with ship speed of 4.5 knots). Data were converted into SEGY format. Further details are available at https://doi.org/10.1038/NGEO2671.
    Keywords: Binary Object; Binary Object (File Size); Continental rifting; continent-ocean transition; DATE/TIME; Date/time end; Event label; OBS; OBS 72; OBS 73; Ocean bottom seismometer; POS453; POS453_731-1; POS453_739-1; Poseidon; Station label; West Iberia; wide-angle seismic
    Type: Dataset
    Format: text/tab-separated-values, 1392 data points
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  • 6
    Publication Date: 2024-01-13
    Description: Seismic data was acquired to study the transition from rifted continental crust to oceanic crust at the Deep Galicia Margin from June to August 2013. 3D Multichannel reflection and coincident wide-angle seismic data were acquired simultaneously as part of a seismic experiment over an area of 80 km long and 25 km wide in the Deep Galicia margin. The multichannel reflection seismic volume was acquired by the R/V Marcus G. Langseth, which provided a source for the ocean bottom seismic data. A total of 86 ocean bottom hydrophones/seismometer deployments were carried out by F/S Poseidon. Two airgun arrays with total gun volumes of 3,300 cu.in. were deployed as seismic sources. Shots were fired alternately using two source arrays every 37.5 m (shot interval of ~ 16 s with ship speed of 4.5 knots). Data were converted into SEGY format. Further details are available at https://doi.org/10.1038/NGEO2671.
    Keywords: Binary Object; Binary Object (File Size); Continental rifting; continent-ocean transition; DATE/TIME; Event label; File name; Julian day; Latitude of event; Longitude of event; OBH; OBH 02; OBH 04; OBH 06; OBH 08; OBH 12; OBH 14; OBH 26; OBH 30; OBH 32; OBH 56; OBH 58; OBH 60; OBH 62; OBH 63; OBH 65; OBH 67; OBH 68; OBH 71; OBH 79; OBH 80; OBH 81; OBH 82; OBH 83; OBH 85; OBH 86; OBS; OBS 1; OBS 11; OBS 13; OBS 15; OBS 16; OBS 17; OBS 18; OBS 19; OBS 20; OBS 21; OBS 22; OBS 23; OBS 24; OBS 25; OBS 27; OBS 29; OBS 3; OBS 33; OBS 34; OBS 35; OBS 37; OBS 38; OBS 39; OBS 40; OBS 41; OBS 42; OBS 43; OBS 45; OBS 46; OBS 47; OBS 48; OBS 5; OBS 51; OBS 52; OBS 53; OBS 54; OBS 57; OBS 59; OBS 61; OBS 64; OBS 66; OBS 69; OBS 72; OBS 73; OBS 74; OBS 75; OBS 76; OBS 78; OBS 9; Ocean bottom hydrophone; Ocean bottom seismometer; POS453; POS453_723-3; POS453_724-1; POS453_725-1; POS453_726-1; POS453_728-1; POS453_729-1; POS453_730-1; POS453_731-1; POS453_733-1; POS453_734-1; POS453_735-1; POS453_736-1; POS453_737-1; POS453_738-1; POS453_739-1; POS453_740-1; POS453_741-1; POS453_742-1; POS453_743-1; POS453_746-1; POS453_747-1; POS453_748-1; POS453_749-1; POS453_751-1; POS453_752-1; POS453_753-1; POS453_754-1; POS453_755-1; POS453_756-1; POS453_757-1; POS453_758-1; POS453_759-1; POS453_761-1; POS453_762-1; POS453_763-1; POS453_764-1; POS453_765-1; POS453_766-1; POS453_767-1; POS453_769-1; POS453_770-1; POS453_771-1; POS453_773-1; POS453_774-1; POS453_775-1; POS453_778-1; POS453_779-1; POS453_780-1; POS453_781-1; POS453_782-1; POS453_783-1; POS453_785-1; POS453_786-1; POS453_787-1; POS453_788-1; POS453_789-1; POS453_790-1; POS453_792-1; POS453_793-1; POS453_794-1; POS453_795-1; POS453_796-1; POS453_797-1; POS453_798-1; POS453_799-1; POS453_801-1; POS453_802-1; POS453_820-1; POS453_821-1; POS453_822-1; POS453_823-1; POS453_824-1; POS453_825-1; POS453_826-1; Poseidon; Station label; Type; West Iberia; wide-angle seismic
    Type: Dataset
    Format: text/tab-separated-values, 25990 data points
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  • 7
    Publication Date: 2024-02-27
    Description: Raw multibeam bathymetry data were recorded on RV Meteor during M62/4 using an Atlas Hydrosweep DS2 multibeam echosounder. The cruise took place between 2004-09-30 (Mindelo) – 2004-11-04 (Recife) in the Southern Atlantic. Data were recorded in international waters outside EEZs as well as within the Ascension Island EEZ with an approximate average depth of around 1500m. There is no information about sound velocity correction made. There are no extra SVP files provided in this publication. Data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors can be expected due to the lack of proper SVP. The aims of M62-4 were to investigate the tectonics and structure of the Ascension transform inside-outside corner pair and to constrain the processes of segmentation occurring at the Mid-Atlantic Ridge just south of the Ascension FZ. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Data publication is accomplished within work package 2 of the EU Horizon 2020 project iAtlantic- Integrated Assessment of Atlantic Marine Ecosystem in Space and Time (https://www.iatlantic.eu/).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; Extracted with MB-System; File content; iAtlantic; Integrated Assessment of Atlantic Marine Ecosystems in Space and Time; LATITUDE; LONGITUDE; M62/4; M62/4_0_Underway-1; Meteor (1986); Multibeam Echosounder; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Atlas Hydrosweep DS-2
    Type: Dataset
    Format: text/tab-separated-values, 25938 data points
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  • 8
    Publication Date: 1991-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
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  • 9
  • 10
    Publication Date: 1999-01-01
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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