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  • 2015-2019  (128)
  • 1995-1999  (6)
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  • 1
    Keywords: Hochschulschrift ; Chile ; Erdbeben ; Seismologie
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    DDC: 540
    Language: English
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  • 2
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (95 Blatt = 32 MB) , Illustrationen, Diagramme, Karten
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 3
    Type of Medium: Online Resource
    Pages: 43 S.; graph. Darst.
    Edition: Online-Ausg. Online-Ressource
    Series Statement: GEOMAR Report N.S. 24
    Language: English , German
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 126 (1996), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Upper-mantle structure of Indian Ocean spreading ridges was investigated by track segments of Geosat/ERM altimeter measurements. To determine the upper-mantle structure of the Earth's gravity field, a low-degree and -order spherical harmonic representation of the geoid was removed. A test of several reference fields suggested that a degree 2–25 field with gradually rolled off coefficients (Sandwell & Renkin 1988) offers an adequate representation of the long-wavelength geoidal undulations.Filtered profiles of three individual ridge segments display a strong asymmetry in geoid versus age trends of conjugated rift flanks. The unusually low geoid slopes on one flank can perhaps best be explained as a dynamic or thermal phenomenon reflecting a flow connection between a neighbouring off-axis hotspot plume and the ridge axis, while the other flank simply cools as it spreads away from the axial zone. It seems reasonable to hypothesize that the Southwest Indian Ridge and the Southeast Indian Ridge act as sinks for plumes beneath Agulhas Plateau and Kerguelen Islands, respectively. The Carlsberg Ridge data suggest that the Réunion hotspot contaminated northwestern African lithosphere until 15 Ma. Moreover, symmetric flattening of geoid versus age trends of conjugated ridge flanks offers evidence that plume events affect geoid versus age trends
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 124 (1996), S. 0 
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic refraction velocity data from the acoustic basement (called layer 2A) have been compiled for different mid-ocean ridges. The data from post-1970 studies show a strong correlation between velocity and basement age. Importantly, velocities double in less than 10 Myr for all ridges, but for older crust, up to 160 Myr in age, velocities do not increase significantly.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Marine geophysical researches 19 (1997), S. 1-23 
    ISSN: 1573-0581
    Keywords: Extinct spreading axis ; oceanic crust ; seismic refraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Two seismic refraction and gravity lines were obtained along and normal to the axis of the Aegir Rift, an extinct spreading centre in the Norway Basin. Velocity-depth solutions and crustal structure models are derived from ocean-bottom records using two-dimensional ray tracing and synthetic seismogram modelling techniques. Gravity data are used to generate models consistent with the lateral variations in thickness of the layers in the crustal models. The resulting models require considerable degree of lateral inhomogeneity along and perpendicular to the rift axis. Crust within the extinct spreading centre is found to be thinner and of low P-wave velocity when compared with the crust sampled off-axis. To explain reduced velocities of the lower crust we suggest that, due to the relationship between fracturing and seismic velocity, the decreasing spreading rate leading up to extinction let the mechanically strong layer thicken, so that faulting and fracturing extended to greater depths . Low velocities are also observed in the uppermost mantle underlying the extinct spreading ridge. This zone is attributed to hydrothermal alteration of upper mantle peridotites. Furthermore, after spreading ceased 32-26 my ago, ongoing passive hydrothermal circulation was accompanied by the precipitation of alteration products in open void spaces, thereby decreasing the porosity and increasing the velocity. Consequently the typical low velocities of layer 2 found at active mid-ocean ridges have been replaced by values typical of mature oceanic crust.
    Type of Medium: Electronic Resource
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  • 7
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    Leitstelle Deutsche Forschungsschiffe
    In:  EPIC3Hamburg, Leitstelle Deutsche Forschungsschiffe
    Publication Date: 2018-01-26
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
    Format: application/pdf
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  • 8
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    Unknown
    PANGAEA
    In:  Supplement to: Martinez-Loriente, Sara; Sallarès, Valenti; Ranero, César R; Ruh, Jonas B; Barckhausen, Udo; Grevemeyer, Ingo; Bangs, N L (2019): Influence of Incoming Plate Relief on Overriding Plate Deformation and Earthquake Nucleation: Cocos Ridge Subduction (Costa Rica). Tectonics, 38(12), 4360-4377, https://doi.org/10.1029/2019TC005586
    Publication Date: 2023-05-20
    Description: The TICOSECT program aimed to investigate the crustal structure of the active continental margin of Costa Rica and to understand the geodynamic processes within the subduction system. With the help of a comprehensive wide-angle seismic data set, composed of an onshore/offshore experiment as well as refraction measurements on land in northern Costa Rica, the lithospheric structure from the Middle America Trench (MAT) to the Caribbean lowland was surveyed seismically. Here we provide seismic refraction data from an onshore/offshore seismic profile shot with the US American research vessel RV Mauris Ewing in spring of 1995 offshore of the Osa peninsula during the cruise EW9502. Data are reduced with 6 km/s and origin of the time series is at -2 sec. Note: the profile has been shot twice with a different shot interval at 25 s (p301) and 60 s (p302). Additional data from US partners can be found at http://www-udc.ig.utexas.edu/sdc/cruise.php?cruiseIn=ew9502.
    Keywords: A30/S30; Costa Rica; crustal structure; Event label; EW9502; EW9502_obh81; EW9502_obh83; EW9502_obh89; EW9502_obh91; EW9502_obh93; EW9502_obh95; EW9502_obh97; EW9502_p301; EW9502_p302; File content; File format; File name; File size; L02; L03; L05; L07; L09; L12; L14; Latitude of event; Longitude of event; Maurice Ewing; OBH; obh81; obh83; obh89; obh91; obh93; obh95; obh97; Ocean bottom hydrophone; onshore/offshore; Osa peninsula; S30; Sampling on land; SEIS; Seismic; Seismic refraction data; TICOSECT; TICOSECT_L02; TICOSECT_L03; TICOSECT_L05; TICOSECT_L07; TICOSECT_L09; TICOSECT_L12; TICOSECT_L14; Uniform resource locator/link to metadata file; Uniform resource locator/link to sgy data file; Vertical geophone; V-GP
    Type: Dataset
    Format: text/tab-separated-values, 122 data points
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  • 9
    Publication Date: 2023-09-01
    Keywords: Area/locality; Conductivity, average; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of conductivity measurements; Number of temperature data; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 690 data points
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  • 10
    Publication Date: 2023-10-28
    Description: Between 08.08.2003 and 02.09.2003, bathymetric data was acquired offshore Guatemala and Costa Rica during the R/V SONNE cruise SO173/2. The expedition comprised geophysical and biological research objectives. One aim was the acquisition of geophysical data for a better understanding of recent and long-term evolution of the Middle America Landbridge and mass flux into the subduction system. Moreover, the cruise was also dedicated to studying the sensory systems of mesopelagic fish, cephalopods, crustaceans and teleosts by using trawl gear and morphometric studies. Bathymetric mapping with the multibeam echosounder (MBES) SIMRAD EM120 was utilized to obtain a full coverage bathymetric map along the El Salvador and Guatemalan continental slope and to complete previous maps by filling gaps along the continental slope and oceanic plate of Nicaragua. Further geophysical instruments, such as the sub-bottom profiler PARASOUND, magnetometer, a dredge and seismic instrumentation, and biological equipment including trawling gear and lab instrumentation, complemented the research equipment. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the SO173/2 cruise, the hull-mounted multibeam echosounder (MBES) SIMRAD EM120 was utilized to perform bathymetric mapping. It allows to conduct surveys in water depths of up to 11,000 m. Two transducer arrays transmit successive frequency coded acoustic signals (11.25 to 12.6 kHz). Data acquisition is based on successive emission-reception cycles of the signal. While the emission beam has a dimension of 150° across and 2° along track, the reception is obtained from 191 overlapping beams with widths of 2° across and 20° along track. The beam footprint has a dimension of 2° by 2°. The beam spacing can be set to equidistant or equiangular. For further information on the system, consult: https://www.km.kongsberg.com/ Depth is estimated from each beam by using the two-way travel time and the beam angle known from each beam, and taking into account the ray bending due to refraction in the water column by sound speed variations. Combining phase and amplitude is used to provide measurement accuracy practically independent of the beam pointing angle. During the SO173 cruise, the EM120 was used continuously. At the beginning of the cruise, a sound velocity profile was measured to a depth of 2000 m. Responsible person during this cruise / PI: Wilhelm Weinrebe (wweinrebe@ifm-geomar.de) Chief Scientist: Wilhelm Weinrebe (wweinrebe@ifm-geomar.de) CR: http://oceanrep.geomar.de/13407/1/Geomar-Report-116.pdf CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2003/20040060.htm This dataset was published as part of: Geersen, Jacob (2019): Collated bathymetric data from convergent margins that experienced tsunami earthquakes. PANGAEA, https://doi.org/10.1594/PANGAEA.899049
    Keywords: Bathymetry; CT; East Pacific off S Middle Amerika; EM120; File format; File name; File size; GEOMAR; Helmholtz Centre for Ocean Research Kiel; hydroacoustics; Pacific; SEDUCTION; SFB574; SO173/2; SO173/2-track; Sonne; Underway cruise track measurements; Uniform resource locator/link to file; Volatiles and Fluids in Subduction Zones
    Type: Dataset
    Format: text/tab-separated-values, 4340 data points
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