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  • Articles  (2)
  • Data  (3)
  • OceanRep  (314)
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  • 1
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    Sound velocity at CTD station SO194_CTD-1 (2009)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: BIO-LUMINESZENZ; CTD; CTD/Rosette; CTD-RO; DEPTH, water; SO194_CTD-1; SO194/1; Sonne; Sound velocity in water; South Pacific Ocean
    Type: Dataset
    Format: text/tab-separated-values, 198 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Multibeam bathymetry raw data (Atlas Hydrosweep DS echo sounder entire dataset) of RV SONNE during cruise SO96/1 (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam bathymetry raw data was recorded in the North Pacific during cruise SO96/1 that took place between 1994-06-09 and 1994-06-27. The data was collected using the ship's own Atlas Hydrosweep DS echo sounder.
    Keywords: Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; Event label; File content; KODIAKSEIS; LATITUDE; LONGITUDE; Number of pings; Ship speed; SO96/1; SO96/1_0_Underway-1; Sonne; 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
    Type: Dataset
    Format: text/tab-separated-values, 493 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Ocean hydrophone sgy-files of seismic refraction and wide angle data from the marine fore-arc off Nicaragua from profiles NIC20 and NIC50 of R/V Maurice Ewing cruise EW0005 (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: We provide seismic refraction and wide-angle data from two profile shot across the marine fore-arc of Nicaragua, Central Maerica. Profiles NIC20 and NIC50 were obtained aboard the US R/V Maurice Ewing cruise EW00–05 in 2000. All profile run across the condinantal margin and provide in total 26 digital record sections.
    Keywords: 1992 Nicaragua tsunami earthquake; Binary Object; Binary Object (File Size); Event label; EW0005; EW0005_NIC20; EW0005_NIC50; EW0005_OBH01; EW0005_OBH02; EW0005_OBH03; EW0005_OBH04; EW0005_OBH05; EW0005_OBH06; EW0005_OBH07; EW0005_OBH08; EW0005_OBH09; EW0005_OBH10; EW0005_OBH11; EW0005_OBH12; EW0005_OBH13; EW0005_OBH15; EW0005_OBH16; EW0005_OBH17; EW0005_OBH19; EW0005_OBH20; EW0005_OBH21; EW0005_OBH22; EW0005_OBH23; EW0005_OBH24; EW0005_OBH25; EW0005_OBH26; EW0005_OBH27; EW0005_OBH28; File content; Latitude of event; Longitude of event; Marine Fore-arc; Maurice Ewing; North Pacific Ocean; OBH; Ocean bottom hydrophone; SEIS; Seismic; seismic refraction; Seismic structure; Seismic tomography
    Type: Dataset
    Format: text/tab-separated-values, 30 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
    Electronic Resource
    Electronic Resource
    An automated ray method for diffraction modelling in complex media (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 116 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: We present the computational concept and first results of an automated 2-D ray-tracing algorithm which combines the standard ray method with the method of edge waves and paraxial ray tracing. Reliable ray synthetic seismograms are obtained for subsurface structures of high complexity. Both diffracted and multiple diffracted arrivals are automatically computed, complementing all types of primary arrivals (reflected, multiple reflected, converted waves, etc.) where geometric shadow zones are caused by edges (inhomogeneities) in the subsurface model. The method of computation can be summarized as follows: (1) during standard ray tracing, properties of central and paraxial rays are computed for a set of neighbouring rays. (2) Diffraction points (edges) are identified by comparing the amplitude and traveltime differences of neighbouring rays with the corresponding values of their paraxial approximation. (3) Detected edges are used as source points for diffracted rays. (4) Repetition of (1)-(3) for diffracted rays allows computation of multiple diffractions (‘diffracted diffractions’). (5) The amplitude decay of diffracted arrivals is computed according to the theory of edge waves. Its critical variables are expressed in terms of second-order paraxial traveltimes. The method is demonstrated for a simple and complex synthetic model and a real data complex model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb02124.x
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    NIZUSE: a deep seismic reflection line in north-eastern Germany (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 161-169 
    Details
    ISSN: 1437-3262
    Keywords: Deep seismic reflection profiling ; Northeast German Basin ; External Variscides ; North German Massif ; Rugen-Pomorze Terrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Out of a dense network of seismic reflection lines for hydrocarbon exploration in the North-east German Basin, several lines were recorded to 12 s TWT to obtain information about the structure of the crust and the crust-mantle transition. One of these profiles is presented here. This stretches for 110 km in a NNE direction between Neustrelitz and the island of Usedom. It reaches from the External Variscides in the south across the North German Massif into the Rügen-Pomorze Terrane in the Baltic Sea. Below Cenozoic-Mesozoic-Paleozoic cover with clear reflections down to base Zechstein, the reflectivity varies considerably with depth and also laterally. The Paleozoic and Precambrian sediments and basement are generally void of reflections, but the lower crust and the Moho show strong reflections. To the north the reflectivity decreases, and the Moho depth increases to beyond the bottom of the record section at 12 s. There are no direct indications for deep-reaching faults such as the Trans-European Fault in the north. The North German Massif acted as a ramp towards the Variscan Orogeny, similar to the London-Brabant Massif further west.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00211899
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
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    Repeating earthquakes in the outer rise offshore of southern Chile (2006)
    Details
    Publication Date: 2023-01-31
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Poster
  • 7
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    The crustal structure of the convergent Nicaraguan margin from a combined reflection and refraction study (2002)
    Details
    Publication Date: 2023-01-31
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 8
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    Passive Seismology On- and Offshore Costa Rica (2003)
    Details
    Publication Date: 2023-01-31
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 9
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    Structure and hydration of the subducting plate offshore Nicaragua (2006)
    Details
    Publication Date: 2023-01-31
    Type: Conference or Workshop Item , NonPeerReviewed
    Location Call Number Limitation Availability
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    OceanRep: Talk
  • 10
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    The crustal structure of the convergent Nicaraguan margin from a combined MCS and refraction study (2002)
    Details
    Publication Date: 2023-01-31
    Description: We present seismic profiles from an extensive multi-channel-seismic and wide-angle survey acquired in June 2000 during R/V Maurice Ewing (cruise EW 00-05). The seismic measurements were carried out using a 6 km long streamer, 14 ocean bottom hydrophones (OBH) and 9 landstations recording marine airgun shots from an 136 l airgun-array. The objective of this study is to improve the knowledge about the structure of the convergent Nicaraguan margin, which is located between the intensively studied margins of Guatemala to the north and Costa Rica to the south. The Cocos Plate, which is formed by the fast East Pacific Rise to the East and the Cocos Nazca Spreading Center to the South subducts beneath Nicaragua nearly orthogonal to the trench. Here, the Cocos Plate was formed at the East Pacific Rise about 24 Myr ago. The nearly 100 km wide continental shelf of Nicaragua includes the more than 10 km deep Sandino Basin. The seismic data yield detailed images of the subducting oceanic plate and the tectonic structure of the continental plate. A more than 250 km long transect from the outer rise to the volcanic arc and a 180 km long strike line along the upper slope of the margin are presented. The wide-angle data were interpreted using forward modeling techniques. The MCS data are processed up to a time migration and integrated into the refraction model. At the outer rise the oceanic crust is only 5 km thick and some deep reflections cut trough the moho into the upper mantle. Towards the trench the seafloor is strongly faulted in response to the plate flexure. The frontal sediments in the continental plate are less than 1.5 km wide. The slope sediments are divided by a basement high into a shallower (〈 3 km thick) part to the southwest and the deep Sandino basin with 7 km of sediments close to the coastline. This basement high is situated in the projection of the Santa Elena Peninsula in northern Costa Rica. The underlying basement shows a high velocity and a high landward velocity gradient from 3.5 km/s at the tip of the margin wedge up to 6 km/s below the Sandino basin. These velocities suggest that the margin wedge is composed of ophiolitic rock similar to the Nicoya complex in Cost Rica. Beneath this basement we find an enigmatic high velocity material that trends parallel to the subduction slab.
    Type: Conference or Workshop Item , NonPeerReviewed
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    OceanRep: Talk
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