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  • AGU (American Geophysical Union)  (11)
  • PANGAEA  (6)
  • American Geophysical Union (AGU)
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  • 1
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    Ocean bottom seismic data from the continent-ocean transition in the Deep Galicia Margin, offshore west Iberia (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    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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    DATA PANGAEA
  • 2
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    Multibeam bathymetry raw data (Atlas Hydrosweep DS 2 echo sounder entire dataset) of RV METEOR during cruise M62/4 (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    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
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 3
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    Ocean bottom seismic data from the continent-ocean transition in the Deep Galicia Margin, offshore west Iberia: continuous data (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    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
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Ocean bottom seismic data from the continent-ocean transition in the Deep Galicia Margin, offshore west Iberia: miniSeed data (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    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
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 5
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    Wide-angle seismic data of the Porcupine Basin during METEOR cruise M61/2 (2018)
    PANGAEA
    Details
    Publication Date: 2024-04-18
    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
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 6
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    Ocean bottom seismic data from the continent-ocean transition in the Deep Galicia Margin, offshore west Iberia: active source data (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    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
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    DATA PANGAEA
  • 7
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    Microearthquake seismicity of the Mid-Atlantic Ridge at 5°S: A view of tectonic extension (2004)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 109 . B06102.
    Details
    Publication Date: 2018-04-25
    Description: We report measurements made with an ocean bottom array which was operated for 10 days on the Mid-Atlantic Ridge just south of the 5°S transform fault/fracture zone. A total of 148 locatable earthquakes with magnitudes ∼0.5–2.8 were recorded; seismic activity appears to be concentrated within the western half of the median valley. The median valley seismic zone is bounded in along-axis direction by the transform fault to the north and the tip of the axial volcanic ridge to the south. A few scattered events occurred within the inside corner high, on the transform fault, and in the western sidewall close to the segment center. Earthquakes reach a maximum depth of 8 km below the median valley floor and appear to be predominantly in the mantle, although a few crustal earthquakes also occurred. The presence of earthquakes in the mantle indicates that it is not strongly serpentinized. We infer the median valley seismic activity to primarily arise from normal faulting.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Imaging and quantification of gas hydrate and free gas at the Storegga Slide offshore Norway (2005)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 32 . L04308.
    Details
    Publication Date: 2018-03-28
    Description: Wide–angle reflection seismic experiments were performed at the Storegga slide offshore Norway in 2002 with the goal to quantify the amount of gas hydrate and free gas in the sediment. Twenty‐two stations with Ocean Bottom Hydrophones (OBH) and Seismometers (OBS) were deployed for a 2D and a 3D experiment. Kirchhoff depth migration is used to transform the seismic wide–angle data into images of the sediment layers and to obtain P wave velocity–depth functions. The gas hydrate and free gas saturations are estimated from the elastic properties of the sediment on the basis of the Frenkel–Gassmann equations. There is 5–15% gas hydrate in the pore space of the sediment in the gas hydrate stability zone (GHSZ). The free gas saturation takes the value of 0.8% for a homogeneous distribution of gas in the pore water and 7% for the model of a patchy gas distribution.
    Type: Article , PeerReviewed
    Format: text
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  • 9
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    Mid-depth internal wave energy off the Iberian Peninsula estimated from seismic reflection data (2008)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Oceans, 113 . C12016.
    Details
    Publication Date: 2019-09-23
    Description: Energy levels of internal waves are estimated from seismic reflection data. Three legacy seismic sections from 1993 and 1997 obtained off the Iberian Peninsula have been analyzed for acoustic reflections within the water column. The reflections are aligned continuously for up to several kilometers over large parts of the sections and in the depth interval from 200 to 2000 m. Depth variations of these reflections are thought to be caused by the background internal wave field. From the variations we derive horizontal wave number spectra of normalized internal wave displacement. The general slope of the power density spectra is remarkably consistent for all sections and agrees well with model spectra for internal waves. Significant differences within the sections can be found when sufficiently large subsections are averaged. The spatial variation of the energy level indicates increasing internal wave activity with shallower water depths as well as near a subsurface eddy.
    Type: Article , PeerReviewed
    Format: text
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  • 10
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    Continental hyperextension, mantle exhumation and thin oceanic crust at the continent-ocean transition, West Iberia: new insights from wide-angle seismic (2016)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Solid Earth, 121 (5). pp. 3177-3199.
    Details
    Publication Date: 2019-04-08
    Description: Hyperextension of continental crust at the Deep Galicia rifted margin in the North Atlantic has been accommodated by the rotation of continental fault blocks, which are underlain by the S reflector, an interpreted detachment fault, along which exhumed and serpentinized mantle peridotite is observed. West of these features, the enigmatic Peridotite Ridge has been inferred to delimit the western extent of the continent-ocean transition. An outstanding question at this margin is where oceanic crust begins, with little existing data to constrain this boundary and a lack of clear seafloor spreading magnetic anomalies. Here we present results from a 160 km long wide-angle seismic profile (Western Extension 1). Travel time tomography models of the crustal compressional velocity structure reveal highly thinned and rotated crustal blocks separated from the underlying mantle by the S reflector. The S reflector correlates with the 6.0–7.0 km s−1 velocity contours, corresponding to peridotite serpentinization of 60–30%, respectively. West of the Peridotite Ridge, shallow and sparse Moho reflections indicate the earliest formation of an anomalously thin oceanic crustal layer, which increases in thickness from ~0.5 km at ~20 km west of the Peridotite Ridge to ~1.5 km, 35 km further west. P wave velocities increase smoothly and rapidly below top basement, to a depth of 2.8–3.5 km, with an average velocity gradient of 1.0 s−1. Below this, velocities slowly increase toward typical mantle velocities. Such a downward increase into mantle velocities is interpreted as decreasing serpentinization of mantle rock with depth.
    Type: Article , PeerReviewed
    Format: text
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