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  • AGU (American Geophysical Union)  (5)
  • Blackwell Science Pty  (1)
  • 2000-2004  (6)
Document type
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Preface (2004)
    Melbourne, Australia : Blackwell Science Pty
    The @island arc 13 (2004), S. 0 
    Details
    ISSN: 1440-1738
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1738.2003.00419.x
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Focussing on Proto-Seismogenic Zone of erosional Convergent Margin (2004)
    AGU (American Geophysical Union)
    In:  Eos, Transactions American Geophysical Union, 85 (7).
    Details
    Publication Date: 2017-02-14
    Description: Great earthquakes in subduction zones occur after stable slip in the proto-seismogenic zone transitions to the unstable slip that characterizes seismogenic zones. Subducted material input to seismogenic zones affects this transition. Material structure, lithology and physical properties change progressively during subduction, and according to current hypotheses, specific material transformations trigger the stable to unstable slip transition.Where accretion dominates a convergent margin, material input is trench sediment that is easily drill-sampled. However, where erosion dominates a margin, material input is unknown because it originates along the base of the upper plate and alters differently. The depth at which material is eroded lies beyond the sampling capabilities of past scientific ocean drilling, so the protoseismogenic zone transformed material has never been drill-sampled; nor does geophysics resolve its structure, lithology, and physical properties. The Japanese riser drill ship Chikyu in the Integrated Ocean Drilling Program (IODP) overcomes this difficulty. Preparing a site for deep drilling is a much greater task than preparing the shallower sites of past programs, so this is accomplished during workshops.
    Type: Article , NonPeerReviewed
    Format: text
    DOI: 10.1029/2004EO070003
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    OceanRep: Article in a Scientific Journal - without review
  • 3
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    Discussions of ODP Leg 205 and Drilling of Middle America Seismogenic Zone (2003)
    AGU (American Geophysical Union)
    In:  Eos, Transactions American Geophysical Union, 84 (10).
    Details
    Publication Date: 2019-09-23
    Description: Erosional convergent margins, where material is removed from the base of the upper plate and subducted on the lower plate, are fundamental features of the Circum Pacific. The erosional Middle America Trench convergent Pacific margin, remarkable for its broad diversity of dynamic environments, is a natural laboratory for studying convergent margin processes and seismogenesis. These environments include a shallow and deep trench axis, shallow-to-steep-dipping plate interfaces, abnormally hot-to-cold subducting plate temperatures, and a subducting plate with smooth morphology bordering basement ridges and seamounts. The subducting topography accelerates erosion and localizes seismicity.
    Type: Article , NonPeerReviewed
    Format: text
    DOI: 10.1029/2003EO100004
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    OceanRep: Article in a Scientific Journal - without review
  • 4
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    Gas Hydrates Along the Peru and Middle America Trench Systems (2001)
    AGU (American Geophysical Union)
    In:  In: Natural Gas Hydrates: Occurence, distribution, and Detection. , ed. by Paull, C. K. and Dillon, W. P. Geophysical Monograph Series, 124 . AGU (American Geophysical Union), Washington, DC, pp. 257-271.
    Details
    Publication Date: 2019-08-06
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1029/GM124p0257
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    OceanRep: Book chapter
  • 5
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    Revised tectonic boundaries in the Cocos Plate off Costa Rica: Implications for the segmentation of the convergent margin and for plate tectonic models (2001)
    AGU (American Geophysical Union)
    Details
    Publication Date: 2023-09-19
    Description: The oceanic Cocos Plate subducting beneath Costa Rica has a complex plate tectonic history resulting in segmentation. New lines of magnetic data clearly define tectonic boundaries which separate lithosphere formed at the East Pacific Rise from lithosphere formed at the Cocos-Nazca spreading center. They also define two early phase Cocos-Nazca spreading regimes and a major propagator. In addition to these sharply defined tectonic boundaries are overprinted boundaries from volcanism during passage of Cocos Plate over the Galapagos hot spot. The subducted segment boundaries correspond with distinct changes in upper plate tectonic structure and features of the subducted slab. Newly identified seafloor-spreading anomalies show oceanic lithosphere formed during initial breakup of the Farallon Plate at 22.7 Ma and opening of the Cocos-Nazca spreading center. A revised regional compilation of magnetic anomalies allows refinement of plate tectonic models for the early history of the Cocos-Nazca spreading center. At 19.5 Ma a major ridge jump reshaped its geometry, and after ∼14.5 Ma multiple southward ridge jumps led to a highly asymmetric accretion of lithosphere. A suspected cause of ridge jumps is an interaction of the Cocos-Nazca spreading center with the Galapagos hot spot.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Subduction erosion and basal friction along the sediment-starved convergent margin off Antofagasta, Chile (2003)
    AGU (American Geophysical Union)
    Details
    Publication Date: 2022-03-04
    Description: Subduction erosion is commonly associated with strong interplate coupling and a consequent abrasion of the upper plate. Northern Chile is an often cited example of a strongly coupled erosional margin. Its crystalline basement is inferred to form a strong upper plate, the trench axis contains little detectable sediment, and the subducting lower plate has a high‐relief horst‐graben topography. With little water‐rich sediment to reduce interplate friction, the high relief of an igneous ocean crust thrust beneath continental basement should generate high friction interplate abrasion. However, a prestack depth‐migrated seismic record images slope debris that collects in a frontal prism. This debris, including ∼30% pore fluid, fills subducting grabens and is subsequently incorporated into an ∼1.5‐km‐thick interplate reflective layer. The subduction zone thrust passes through the upper part of this layer. Interplate seismicity and taper analyses indicate basal friction at levels that are common in sedimented convergent margins. The continued growth of lower plate grabens after subduction probably accommodates upper plate material, a process that erodes the upper plate. Erosion is aided by weakening of the upper plate rock framework beneath the continental slope. This erosion undermines the upper plate and tips it seaward thereby steepening the continental slope which induces midslope gravity tectonics. Despite sediment starvation, a frontal prism constructed of remolded slope debris elevates pore pressure to reduce interplate friction. Coeval erosion and prism building control the size of the frontal prism. Processes other than high friction abrasion best explain subduction erosion along northern Chile.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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