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  • AGU (American Geophysical Union)  (29)
  • Kiel : GEOMAR, Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel  (3)
  • Springer  (3)
  • IFM-GEOMAR, Kiel  (2)
  • IFM-Geomar, Kiel  (2)
Language
  • 1
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource ([14] p. = 61,0 KB)
    Edition: [Elektronische Ressource]
    Language: German , English
    Note: Contract BMBF 03G144 A. - Differences between the printed and electronic version of the document are possible. - nBibliography p. [8] - [10] , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 2
    Keywords: Forschungsbericht
    Description / Table of Contents: Hot spot volcanism, Musicians Seamounts, Italian Ridge, Bach Ridge, Crustal Structure, Ocean bottom hydrophones
    Type of Medium: Online Resource
    Pages: Online-Ressource ([10] p. = 57,6 KB)
    Edition: [Elektronische Ressource]
    Language: German , English
    Note: Contract BMBF 03G142A. - Differences between the printed and electronic version of the document are possible. - Engl. abstract under title: SO 142-HULA II: Interdisciplinary investigations on the timing of the Hawaii-emperor bend and the origin of lithospheric anomalies along the musician seamount chain. - nBibliography p. [5] - [6]. - nIndex p. 7 , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 3
    Keywords: Forschungsbericht
    Description / Table of Contents: Galápagos Islands, East Pacific, hotspot, plume-ridge interaction, geochemistry, volcanology, magnetic anomalies, morphology
    Type of Medium: Book
    Pages: Getr. Zählung, [296] S. , Ill., graph. Darst., Kt.
    Language: English , German
    Note: Förderkennzeichen BMBF 03 G 144 A , Text teils dt., überw. in engl. Sprache , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Teilweise auch als elektronische Ressource vorh
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    International journal of earth sciences 83 (1994), S. 161-169 
    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
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  • 5
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    IFM-Geomar, Kiel
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 551.22 ; 550
    Language: English
    Type: article , publishedVersion
    Format: 193 S.
    Format: application/pdf
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  • 6
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    IFM-GEOMAR, Kiel
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 550 ; TSZ 300 ; Pazifischer Ozean {Geophysik}
    Language: English
    Type: article , publishedVersion
    Format: 229 S.
    Format: application/pdf
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  • 7
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 551.22 ; 550 ; UKD 100 ; TSZ 200 ; TSJ 200 ; TOH 300 ; TOH 100 ; TOH 200 ; TQC 600 ; Expeditionsberichte {Regionale Ozeanologie, Indischer Ozean} ; Indischer Ozean {Geophysik} ; Südostasien {Geophysik} ; Seismische Wellen {Geophysik} ; Seismometrie {Geophysik} ; Seismische Vorhersagen {Geophysik} ; Tiefseeseismik {Geophysik}
    Language: English
    Type: article , publishedVersion
    Format: 212 S.
    Format: application/pdf
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  • 8
    Publication Date: 2021-03-29
    Description: report
    Keywords: 551.4 ; 551.22 ; 550 ; UKD 100 ; UHD 540 ; TOH 200 ; Expeditionsberichte {Regionale Ozeanologie, Indischer Ozean} ; Lange Wellen außer Gezeitenwellen {Dynamische Ozeanologie} ; Seismische Vorhersagen {Geophysik}
    Language: English
    Type: article , publishedVersion
    Format: 174 S.
    Format: application/pdf
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  • 9
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    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 94 (B11). pp. 16023-16035.
    Publication Date: 2018-03-06
    Description: A seismic refraction profile recorded along the geologic strike of the Chugach Mountains in southern Alaska shows three upper crustal high-velocity layers (6.9, 7.2, and 7.6 km/s) and a unique pattern of strongly focussed echelon arrivals to a distance of 225 km. The group velocity of the ensemble of echelon arrivals is 6.4 km/s. Modeling of this profile with the reflectivity method reveals that the echelon pattern is due to peg-leg multiples generated from with a low-velocity zone between the second and third upper crustal high-velocity layers. The third high-velocity layer (7.6 km/s) is underlain at 18 km depth by a pronounced low-velocity zone that produces a seismic shadow wherein zone peg-leg multiples are seen as echelon arrivals. The interpretation of these echelon arrivals as multiples supersedes an earlier interpretation which attributed them to successive primary reflections arising from alternating high- and low-velocity layers. Synthetic seismogram modeling indicates that a low-velocity zone with transitional upper and lower boundaries generates peg-leg multiples as effectively as one with sharp boundaries. No PmP or Pn arrivals from the subducting oceanic Moho at 30 km depth beneath the western part of the line are observed on the long-offset (90-225 km) data. This may be due to a lower crustal waveguide whose top is the high-velocity (7.6 km/s) layer and whose base is the Moho. A deep (~54 km) reflector is not affected by the waveguide and has been identified in the data. Although peg-leg multiples have been interpreted on some long-range refraction profiles that sound to upper mantle depths, the Chugach Mountains profile is one of the few crustal refraction profiles where peg-leg multiples are clearly observed. This study indicates that multiple and converted phases may be more important in seismic refraction/wide-angle reflection profiles than previously recognized.
    Type: Article , PeerReviewed
    Format: text
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  • 10
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    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research - Solid Earth, 94 (B1). pp. 625-636.
    Publication Date: 2018-03-06
    Description: During a seismic reflection survey conducted by the California Consortium for Crustal Studies in the Basin and Range Province west of the Whipple Mountains, SE California, a piggyback experiment was carried out to collect intermediate offset data (12–31 km). These data were obtained by recording the Vibroseis energy with a second, passive recording array, deployed twice at fixed positions at opposite ends of the reflection lines. The reflection midpoints fall into a 3-km-wide and 15-km-long region in Vidal Valley, roughly parallel to a segment of one of the near-vertical reflection profiles. This data set makes three unique contributions to the geophysical study of this region. (1) From forward modeling of the observed travel times using ray-tracing techniques, a shallow layer with velocities ranging from 6.0 to 6.5 km/s was found. This layer dips to the south from 2-km depth near the Whipple Mountains to a depth of 5-km in Rice Valley. These depths correspond closely to the westward projection of the Whipple detachment fault, which is exposed 1 km east of the near-vertical profiles in the Whipple Mountains. (2) On the near-vertical profile, the reflections from the mylonitically deformed lower plate at upper crustal and mid crustal depths are seen to cease underneath a sedimentary basin in Vidal Valley. However, the piggyback data, which undershoot this basin, show that these reflections are continuous beneath the basin. Thus near-surface energy transmission problems were responsible for the apparent lateral termination of the reflections on the near-vertical reflection profile. (3) The areal distribution of the midpoints allows us to construct a quasi-three-dimensional image on perpendicular profiles; at the cross points we determined the true strike and dip of reflecting horizons. This analysis shows that the reflections from the mylonitically deformed lower plate dip to the southwest westward of the Whipple Mountains and dip to the south southward of the Turtle Mountains. The results of this study support the interpretation of crustal reflectivity in the near-vertical reflection profiles to be related to the mid-Tertiary episode of extension which produced the Whipple metamorphic core complex. This association geometrically suggests a more regionally distributed mechanism for crustal thinning as compared with single detachment fault models.
    Type: Article , PeerReviewed
    Format: text
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