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  • PANGAEA  (9)
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  • 1
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    Seismic Oceanography in the Tyrrhenian Sea - Thermohaline Staircases, Eddies and Internal Waves (2017)
    PANGAEA
    In:  Supplement to: Buffett, Grant George; Krahmann, Gerd; Klaeschen, Dirk; Schroeder, Katrin; Sallarès, Valenti; Papenberg, Cord; Ranero, César R; Zitellini, Nevio (2017): Seismic Oceanography in the Tyrrhenian Sea: Thermohaline Staircases, Eddies, and Internal Waves. Journal of Geophysical Research: Oceans, 122(11), 8503-8523, https://doi.org/10.1002/2017JC012726
    Details
    Publication Date: 2023-01-13
    Description: We use seismic oceanography to document and analyze oceanic thermohaline fine structure across the Tyrrhenian Sea. Multichannel seismic (MCS) reflection data were acquired during the MEDiterranean OCcidental survey in April–May 2010. We deployed along‐track expendable bathythermograph probes simultaneous with MCS acquisition. At nearby locations we gathered conductivity‐temperature‐depth data. An autonomous glider survey added in situ measurements of oceanic properties. The seismic reflectivity clearly delineates thermohaline fine structure in the upper 2,000 m of the water column, indicating the interfaces between Atlantic Water/Winter Intermediate Water, Levantine Intermediate Water, and Tyrrhenian Deep Water. We observe the Northern Tyrrhenian Anticyclone, a near‐surface mesoscale eddy, plus laterally and vertically extensive thermohaline staircases. Using MCS, we are able to fully image the anticyclone to a depth of 800 m and to confirm the horizontal continuity of the thermohaline staircases of more than 200 km. The staircases show the clearest step‐like gradients in the center of the basin while they become more diffuse toward the periphery and bottom, where impedance gradients become too small to be detected by MCS. We quantify the internal wave field and find it to be weak in the region of the eddy and in the center of the staircases, while it is stronger near the coastlines. Our results indicate this is because of the influence of the boundary currents, which disrupt the formation of staircases by preventing diffusive convection. In the interior of the basin, the staircases are clearer and the internal wave field weaker, suggesting that other mixing processes such as double diffusion prevail.
    Type: Dataset
    Format: application/zip, 4 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    High-resolution 3D seismic data set of Four Way Closure Ridge from SONNE cruise SO227 with link to sgy-data file (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: The 3D seismic cube is in SEG-Y format with SP in byte 5, inline number in byte 25 and xline number in byte 17. Processing includes repositioning, time migration and depth conversion using a smoothed velocity field based on Berndt et al., 2019. Acquisition parameters are discussed in the SO227 cruise report (Berndt et al., 2013).
    Keywords: Depth; File content; File format; File name; File size; Four-Way Closure Ridge; P-Cable 3D Seismic; P-Cable 3D seismic cube; Seismic reflection profile; SEISREFL; SO227; SO227_26-1_27-1_28-1; Sonne; Taiflux; Taiwan; Uniform resource locator/link to metadata file; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
    Location Call Number Limitation 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 (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 Limitation Availability
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    DATA PANGAEA
  • 4
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    Hydrophone component of Ocean bottom recording sgy-files of seismic refraction and wide angle data from profile 1172 and 2222 of expedition MGL1307 and POSEIDON cruise POS453 with links to data files (2016)
    PANGAEA
    In:  Supplement to: Davy, Richard G; Minshull, Tim A; Bayrakci, Gaye; Bull, Jonathan M; Klaeschen, Dirk; Papenberg, Cord; Reston, Timothy J; Sawyer, Dale S; Zelt, CA (2016): Continental hyperextension, mantle exhumation, and thin oceanic crust at the continent-ocean transition, West Iberia: New insights from wide-angle seismic. Journal of Geophysical Research: Solid Earth, 121(5), 3177-3199, https://doi.org/10.1002/2016JB012825
    Details
    Publication Date: 2024-02-16
    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.
    Keywords: Date/Time of event; DEPTH, water; Event label; File name; File size; LATITUDE; Line; LONGITUDE; OBH; OBH 79; OBH 80; OBH 81; OBH 82; OBH 83; OBH 85; OBH 86; OBS; OBS 37; OBS 38; OBS 39; OBS 40; OBS 41; OBS 42; OBS 43; OBS 45; OBS 46; OBS 47; OBS 48; OBS 51; OBS 52; OBS 53; OBS 54; OBS 73; OBS 74; OBS 75; OBS 76; OBS 78; Ocean bottom hydrophone; Ocean bottom seismometer; Optional event label; 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_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_782-1; POS453_783-1; POS453_785-1; POS453_786-1; POS453_787-1; POS453_788-1; POS453_789-1; Poseidon; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 212 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Seismic Data from MSM21/4 to Knipovich Ridge on the western Svalbard margin (2015)
    PANGAEA
    In:  Supplement to: Dumke, Ines; Burwicz, Ewa; Berndt, Christian; Klaeschen, Dirk; Feseker, Tomas; Geissler, Wolfram H; Sarkar, Sudipta (2016): Gas hydrate distribution and hydrocarbon maturation north of the Knipovich Ridge, western Svalbard margin. Journal of Geophysical Research: Solid Earth, 121(3), 1405-1424, https://doi.org/10.1002/2015JB012083
    Details
    Publication Date: 2024-02-16
    Description: The seismic data were acquired north of the Knipovich Ridge on the western Svalbard margin during cruise MSM21/4. They were recorded using a Geometrics GeoEel streamer of either 120 channels (profiles p100-p208) or 88 channels (profiles p300-p805) with a group spacing of 1.56 m and a sampling rate of 2 kHz. A GI-Gun (2×1.7 l) with a main frequency of ~150 Hz was used as a source and operated at a shot interval of 6-8 s. Processing of profiles p100-p208 and p600-p805: Positions for each channel were calculated by backtracking along the profiles from the GI-Gun GPS positions. The shot gathers were analyzed for abnormal amplitudes below the seafloor reflection by comparing neighboring traces in different frequency bands within sliding time windows. To suppress surface-generated water noise, a tau-p filter was applied in the shot gather domain. Common mid-point (CMP) profiles were then generated through crooked-line binning with a CMP spacing of 1.5625 m. A zero-phase band-pass filter with corner frequencies of 60 Hz and 360 Hz was applied to the data. Based on regional velocity information from MCS data [Sarkar, 2012], an interpolated and extrapolated 3D interval velocity model was created below the digitized seafloor reflection of the high-resolution streamer data. This velocity model was used to apply a CMP stack and an amplitude-preserving Kirchhoff post-stack time migration. Processing of profiles p400-p500: Data were sampled at 0.5 ms and sorted into common midpoint (CMP) domain with a bin spacing of 5 m. Normal move out correction was carried out with a velocity of 1500 m s-1 and an Ormsby bandpass filter with corner frequencies at 40, 80, 600 and 1000 Hz was applied. The data were time migrated using the water velocity.
    Keywords: Comment; Date/Time of event; Date/Time of event 2; Event label; File name; File size; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; Maria S. Merian; MSM21/4; MSM21/4_548-1; MSM21/4_562-1; MSM21/4_608-1; MSM21/4_619-1; MSM21/4_646-1; MSM21/4_651-1; North Greenland Sea; Seismic profile P100-P102; Seismic profile P200-P208; Seismic profile P400, P500; Seismic profile P600; Seismic profile P700-P706; Seismic profile P800-P805; Seismic reflection profile; SEISREFL; Uniform resource locator/link to sgy data file
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
    Location Call Number Limitation 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: 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 Limitation Availability
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    DATA PANGAEA
  • 7
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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 Limitation Availability
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    DATA PANGAEA
  • 8
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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 Limitation Availability
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    DATA PANGAEA
  • 9
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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
    Location Call Number Limitation Availability
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    DATA PANGAEA
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