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  • 1
    Online Resource
    Online Resource
    Three-dimensional seismic data from the Barents Sea margin reveal evidence of past ice streams and their dynamics
    Geological Society of America ; 2004
    In:  Geology Vol. 32, No. 8 ( 2004), p. 729-
    Details
    In: Geology, Geological Society of America, Vol. 32, No. 8 ( 2004), p. 729-
    Type of Medium: Online Resource
    ISSN: 0091-7613
    URL: Article
    DOI: 10.1130/G20497.1
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2004
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    detail.hit.zdb_id: 2041152-2
    SSG: 13
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Multicomponent ocean bottom cable data in gas hydrate investigation offshore of Norway
    American Geophysical Union (AGU) ; 2003
    In:  Journal of Geophysical Research Vol. 108, No. B8 ( 2003)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 108, No. B8 ( 2003)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JB002245
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    A Double Gas‐Hydrate Related Bottom Simulating Reflector at the Norwegian Continental Margin
    Wiley ; 2000
    In:  Annals of the New York Academy of Sciences Vol. 912, No. 1 ( 2000-01), p. 126-135
    Details
    In: Annals of the New York Academy of Sciences, Wiley, Vol. 912, No. 1 ( 2000-01), p. 126-135
    Abstract: A bstract : An unusual pattern of two bottom simulating reflections (BSRs) has been observed on seismic profiles from the continental margin offshore Western Norway. One of these reflections (BSR1) extends over large areas and has the characteristics of the classical BSR, that is a phase‐reversed reflection from the base of the gas‐hydrate stability zone. The second BSR (BSR0) occurs at approximately 70 ms two‐way travel time beneath BSR1 and is here called a double BSR. The distribution of BSR0 is more local than that of BSR1 and it does not show the phase‐reversal relative to the sea floor reflection that is characteristic for a BSR at the gas hydrate‐free gas boundary. Results from an industrial borehole, from full waveform inversion of multichannel seismic data, from high‐frequency ocean bottom hydrophones, and interpretation of seismic profiles, clearly indicate that BSR1 is reflected from the base of the methane hydrate equilibrium field. Results from full waveform inversion indicate that BSR0 corresponds to a 16–20 m zone where the velocity drops from about 1.8 km/s to a minimum of 1.4 km/s and then increases again. The low velocity of 1.4 km/s suggests the presence of free gas. The results support the hypothesis that BSR0 is a reflection from the base of gas hydrates containing hydrocarbons with a heavier molecular weight in addition to methane gas. Interference of reflections from the top and base of the low‐velocity zone associated with BSR0 explain why BSR0 is not phase‐reversed.
    Type of Medium: Online Resource
    ISSN: 0077-8923 , 1749-6632
    URL: Issue
    URL: Article
    DOI: 10.1111/nyas.2000.912.issue-1
    DOI: 10.1111/j.1749-6632.2000.tb06766.x
    RVK:
    TD 7650
    Language: English
    Publisher: Wiley
    Publication Date: 2000
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    detail.hit.zdb_id: 211003-9
    detail.hit.zdb_id: 2071584-5
    SSG: 11
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Changes of the Hydrate Stability Zone of the Norwegian Margin from Glacial to Interglacial Times
    Wiley ; 2000
    In:  Annals of the New York Academy of Sciences Vol. 912, No. 1 ( 2000-01), p. 200-210
    Details
    In: Annals of the New York Academy of Sciences, Wiley, Vol. 912, No. 1 ( 2000-01), p. 200-210
    Abstract: A bstract : During the last two decades, the detection and quantitative determination of gas hydrate deposits, as well as the study of clathrate formation and dissociation kinetics, have become central fields of marine research. The presence of gas hydrates in oceanic sediments along the Norwegian continental margin is documented in high‐frequency near‐vertical and wide‐angle seismic reflection data. The base of the hydrate stability zone (HSZ) is detected in reflection seismic sections by the occurence of a strong bottom simulating reflector (BSR). The BSR mimics the shape of the sea floor, crosses the sedimentary strata, and is characterized by a strong phase‐reversed event. Below the BSR a low velocity layer is interpreted as a gas‐bearing zone. The inferred thickness of the hydrate existence zone (HEZ) allows for the estimation of the total amount of carbon trapped in gas hydrates at the present time. Modeling the HSZ as a function of temperature and pressure shows a distinct decrease of the HSZ at the Norwegian margin from the last glacial maximum (LGM) to the present time. This highly dynamic HSZ system may provide a complex seismic expression of gas hydrate occurrences, a phenomenon that is far from being well understood.
    Type of Medium: Online Resource
    ISSN: 0077-8923 , 1749-6632
    URL: Issue
    URL: Article
    DOI: 10.1111/nyas.2000.912.issue-1
    DOI: 10.1111/j.1749-6632.2000.tb06774.x
    RVK:
    TD 7650
    Language: English
    Publisher: Wiley
    Publication Date: 2000
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    detail.hit.zdb_id: 211003-9
    detail.hit.zdb_id: 2071584-5
    SSG: 11
    Location Call Number Limitation Availability
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    Online Resource
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