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  • 551.46  (2)
  • 1D_TDC01; 1D_TDC02; 1D_TDC03; 1D_TDC04; 1D_TDC05; 1D_TDC06; 1D_TDC07; 1D_TDC08; 1D_TDC09; 1D_TDC10; 1D_TDC11; 1D_TDC12; 1D_TDC14; 1D_TDC15; 1D_TDC16; 1D_TDC18; 1D_TDC19; 1D_TDC20; 1D_TDC22; 1D_TDC23; 1D_TDC26; AWI_GeoPhy; Binary Object; Clock skew; Code; Comment; Cruise/expedition; Date/time end; Date/time start; ELEVATION; Event label; Hydrophone, serial number; Hydrophone gain; Hydrophone polarity; Hydrophone type; LATITUDE; LONGITUDE; Marine Geophysics @ AWI; MSM20/020-2, MSM24_830-1; MSM20/021-2, MSM24_831-1; MSM20/022-2, MSM24_832-1; MSM20/023-2, MSM24_833-1; MSM20/024-2, MSM24_842-1; MSM20/025-2, MSM24_834-2; MSM20/026-2, MSM24_835-1; MSM20/027-2, MSM24_836-2; MSM20/027-2, MSM24_837-1; MSM20/028-2, MSM24_838-1; MSM20/029-2, MSM24_839-2; MSM20/030-2, MSM24_840-1; MSM20/031-2, MSM24_843-1; MSM20/033-2, MSM24_854-1; MSM20/035-2, MSM24_853-1; MSM20/037-2, MSM24_844-1; MSM20/038-2, MSM24_845-2; MSM20/039-2, MSM24_852-1; MSM20/041-2, MSM24_850-1; MSM20/042-1, MSM24_849-1; MSM20/046-2, MSM24_846-1; OBS; Ocean bottom seismometer; Optional event label; Principal investigator; Priority Programme 1375 SAMPLE: South Atlantic Margin Processes and Links with Onshore Evolution; Project; Recorder, serial number; Recorder type; Sampling rate; Seismometer, serial number; Seismometer gain; Seismometer type; SPP1375; Station label; Tristan da Cunha, South Atlantic Ocean  (1)
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  • 1
    facet.materialart.
    Unknown
    Project ISOLDE: DEPAS ocean-bottom seismometer operations around Tristan da Cunha in 2012-2013 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: According to classic plume theory, the Tristan da Cunha mantle plume played a major role in the rifting of the South Atlantic margins by impinging at the base of the continental lithosphere shortly before or during the breakup of the South Atlantic. Onshore the Tristan mantle plume is associated with the emplacement of the Parana-Etendeka flood basalt province ~132 Ma, and offshore with the age-progressive Walvis Ridge and associated young seamount province. The global data is lacking coverage and therefore resolution around the Tristan da Cunha for shallower mantle depths. The search for deep-reaching geophysical/thermal anomalies beneath Tristan da Cunha was the starting point for a multi-disciplinary geophysical experiment to acquire passive marine electromagnetic, seismic and bathymetric data within the framework of the SPP-1375 “South Atlantic Margin Processes and Links with onshore Evolution” (SAMPLE) funded by the German Science foundation. The experiment included two expeditions with the German research vessel MARIA S. MERIAN in 2012 and 2013. Between February 2012 and January 2013, a network of 24 ocean bottom seismometers (OBS) from the German DEPAS pool (Deutscher Geräte-Pool für Amphibische Seismologie) and 26 ocean-bottom magneto-telluric stations from GEOMAR Kiel and the University of Tokyo were deployed around the archipelago of Tristan da Cunha. The seismological stations are equipped with a Güralp CMG-40T wideband seismometer (60 s) incorporated in a titanium pressure housing, a hydrophone, and a GEOLON MCS (Marine Compact Seismocorder) data logger from SEND GmbH Hamburg, Germany. Each sensor channel is sampled at 50 Hz (2 OBS at 100 Hz), preamplifier gain of the hydrophone channel is 4 and 1 for the three seismometer components. The seismometers are connected to a cardanic levelling mechanism, which was activated every 21 days to level the sensors. Based on previous experiments and triangulation of some stations, the accuracy of the positions is estimated to 500 m. To complement the ocean-bottom network and the existing observatory on Tristan da Cunha (TRIS), two land seismometers and one magnetotelluric station were installed on Nightingale Island located southwest of the main island each of which was equipped with a Güralp-3ESP seismometer (60 s) and an EarthData data logger. As recording parameters, we chose 100 Hz sampling rate and low preamplifier gain (0.4). One of the stations (NIG01) recorded earthquake data for the entire year, while the second station failed after few days due to water damage. Unfortunately, the permanent station TRIS failed also during the experiment.
    Keywords: 1D_TDC01; 1D_TDC02; 1D_TDC03; 1D_TDC04; 1D_TDC05; 1D_TDC06; 1D_TDC07; 1D_TDC08; 1D_TDC09; 1D_TDC10; 1D_TDC11; 1D_TDC12; 1D_TDC14; 1D_TDC15; 1D_TDC16; 1D_TDC18; 1D_TDC19; 1D_TDC20; 1D_TDC22; 1D_TDC23; 1D_TDC26; AWI_GeoPhy; Binary Object; Clock skew; Code; Comment; Cruise/expedition; Date/time end; Date/time start; ELEVATION; Event label; Hydrophone, serial number; Hydrophone gain; Hydrophone polarity; Hydrophone type; LATITUDE; LONGITUDE; Marine Geophysics @ AWI; MSM20/020-2, MSM24_830-1; MSM20/021-2, MSM24_831-1; MSM20/022-2, MSM24_832-1; MSM20/023-2, MSM24_833-1; MSM20/024-2, MSM24_842-1; MSM20/025-2, MSM24_834-2; MSM20/026-2, MSM24_835-1; MSM20/027-2, MSM24_836-2; MSM20/027-2, MSM24_837-1; MSM20/028-2, MSM24_838-1; MSM20/029-2, MSM24_839-2; MSM20/030-2, MSM24_840-1; MSM20/031-2, MSM24_843-1; MSM20/033-2, MSM24_854-1; MSM20/035-2, MSM24_853-1; MSM20/037-2, MSM24_844-1; MSM20/038-2, MSM24_845-2; MSM20/039-2, MSM24_852-1; MSM20/041-2, MSM24_850-1; MSM20/042-1, MSM24_849-1; MSM20/046-2, MSM24_846-1; OBS; Ocean bottom seismometer; Optional event label; Principal investigator; Priority Programme 1375 SAMPLE: South Atlantic Margin Processes and Links with Onshore Evolution; Project; Recorder, serial number; Recorder type; Sampling rate; Seismometer, serial number; Seismometer gain; Seismometer type; SPP1375; Station label; Tristan da Cunha, South Atlantic Ocean
    Type: Dataset
    Format: text/tab-separated-values, 484 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Deposition History and Paleo-Current Activity on the Southeastern Lomonosov Ridge and its Eurasian Flank Based on Seismic Data (2021)
    Details
    Publication Date: 2021-10-01
    Description: A regional seismic survey on the southeastern Lomonosov Ridge (LR) and adjacent basins provides constraints on the coupled evolution of ocean circulations, depositional regime, and tectonic processes. First, Mesozoic strata on the LR, its faulted flanks and the initial Amundsen Basin were covered with syn-rift sediments of Paleocene to early Eocene age. Numerous vertical faults indicate differential compaction of possibly anoxic sediments deposited in the young, still isolated Eurasian Basin. The second stage, as indicated by a prominent high-amplitude-reflector sequence covering the ridge, was a time of widespread changes in deposition conditions, likely controlled by the ongoing subsidence of the LR and gradual opening of the Fram Strait. Episodic incursions of water masses from the North Atlantic probably were the consequences and led to the deposition of thin sedimentary layers of different lithology. The third stage is marked by continuous deposition since the early Miocene (20 Ma). At that time, the ridge no longer posed an obstacle between the Amerasia and Eurasia Basins and pelagic sedimentation was established. Drift bodies, sediment waves, and erosional structures indicate the onset of circulation. Faulting on the ridge slope has led to a series of terraces where sediment drifts have accumulated since the early Miocene. It is suggested that ongoing sagging of the ridge and currents may have shaped the steep sediment free flanks of the terraces. Lastly, a sequence of high-amplitude reflectors marks the transition to the early Pliocene large-scale Northern Hemisphere glaciations.
    Keywords: 551.46 ; 622.15 ; Amundsen Basin ; Arctic Ocean ; Arctic Ocean circulation ; Lomonosov Ridge ; Marine Seismics ; Seismostratigraphy
    Language: English
    Type: map
    Location Call Number Expected Availability
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    CITATION GEO-LEO
  • 3
    facet.materialart.
    Unknown
    Simulated Thermohaline Fingerprints in Response to Different Greenland-Scotland Ridge and Fram Strait Subsidence Histories (2021)
    Details
    Publication Date: 2021-10-25
    Description: Changes in ocean gateway configuration can induce basin-scale rearrangements in ocean current characteristics. However, there is large uncertainty in the relative timing of the Oligocene/Miocene subsidence histories of the Greenland-Scotland Ridge (GSR) and the Fram Strait (FS). By using a climate model, we investigate the temperature and salinity changes in response to the subsidence of these two key ocean gateways during early to middle Miocene. For a singular subsidence of the GSR, we detect warming and a salinity increase in the Nordic Seas and the Arctic Ocean. As convection sites shift to the north of Iceland, North Atlantic Deep Water (NADW) is formed at cooler temperatures. The associated deep ocean cooling and upwelling of deep waters to the Southern Ocean surface can cause a cooling in the southern high latitudes. These characteristic responses to the GSR deepening are independent of the FS being shallow or deep. An isolated subsidence of the FS gateway for a deep GSR shows less pronounced warming and salinity increase in the Nordic Seas. Arctic temperatures remain unaltered, but a stronger salinity increase is detected, which further increases the density of NADW. The increase in salinity enhances the contribution of NADW to the abyssal ocean at the expense of the colder southern source water component. These relative changes largely counteract each other and cause a negligible warming in the upwelling regions of the Southern Ocean.
    Keywords: 551.46 ; Gateway subsidence ; Miocene ; Fingerprints ; Greenland-Scotland Ridge ; Fram Strait ; Temperature and salinity change
    Language: English
    Type: map
    Location Call Number Expected Availability
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    CITATION GEO-LEO
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