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  • 1
    Online Resource
    Online Resource
    Accuracy of gravity measurements off the coast of southern California
    American Geophysical Union (AGU) ; 1963
    In:  Journal of Geophysical Research Vol. 68, No. 10 ( 1963-05-15), p. 3273-3282
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 68, No. 10 ( 1963-05-15), p. 3273-3282
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JZ068i010p03273
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1963
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 3094181-7
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  • 2
    Online Resource
    Online Resource
    Reflections from midcrustal rocks within the Mesozoic Subduction Complex near the Eastern Aleutian Trench
    American Geophysical Union (AGU) ; 1987
    In:  Journal of Geophysical Research: Solid Earth Vol. 92, No. B8 ( 1987-07-10), p. 7907-7915
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 92, No. B8 ( 1987-07-10), p. 7907-7915
    Abstract: Seismic reflection data collected in 1973 by Western Geophysical Company show that highly reflective rocks make up the midcrust of the convergent margin adjacent to the eastern Aleutian Trench. These rocks form an arch that strikes obliquely across the strongly expressed northeast‐southwest structural grain of exposed Mesozoic rocks. In an earlier report we proposed that the deep events mark the location of either the presently subducting plate or the top of underplated rocks. However, the short radius of curvature of this arch precludes the possibility that the deep events indicate the igneous oceanic crust. Instead, the deep reflections could be from underplated rocks that have been arched by the imbrication or underplating of strata below the reflective rocks. High‐amplitude water layer and interbed multiples prevent precise connection of shallow and deep geology. For example, the Border Ranges fault, a suture between major tectonostratigraphic terranes, is not revealed on any of our seismic sections. We speculate, however, that one band of reflections that rises toward but does not reach the surface is from the Eagle River thrust fault, which separates Late Cretaceous melange from deformed turbidite sequences of the same age.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB092iB08p07907
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1987
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    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
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  • 3
    Online Resource
    Online Resource
    Comments on paper by R. L. Chase and E. T. Bunce, ‘Underthrusting of the eastern margin of the Antilles by the floor of the western North Atlantic Ocean, and origin of the Barbados Ridge’
    American Geophysical Union (AGU) ; 1970
    In:  Journal of Geophysical Research Vol. 75, No. 2 ( 1970-01-10), p. 488-490
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 75, No. 2 ( 1970-01-10), p. 488-490
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB075i002p00488
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1970
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    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Focusing on proto‐seismogenic zone of erosional convergent margin
    American Geophysical Union (AGU) ; 2004
    In:  Eos, Transactions American Geophysical Union Vol. 85, No. 7 ( 2004-02-17), p. 70-70
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 85, No. 7 ( 2004-02-17), p. 70-70
    Abstract: 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 of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2004EO070003
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
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  • 5
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    Online Resource
    Reply [to “Comment on ‘Discussions of ODP Leg 205 and drilling of Middle America seismogenic zone’”]
    American Geophysical Union (AGU) ; 2003
    In:  Eos, Transactions American Geophysical Union Vol. 84, No. 32 ( 2003-08-12), p. 303-
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 84, No. 32 ( 2003-08-12), p. 303-
    Abstract: J.N. Murdock' comments regarding our International Ocean Drilling Program (IODP) proposal to penetrate the seismogenic zone in Costa Rica seem to state the following? The plate interface along the Deep Sea Drilling Program (DSDP) drilling transect off Guatemala must be a blind thrust fault; plate convergence may be only 2–3 km in the past 1 m.y.; and our proposed drilling fails to address the most important current scientific issues.
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2003EO320006
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2003
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  • 6
    Online Resource
    Online Resource
    Observations at convergent margins concerning sediment subduction, subduction erosion, and the growth of continental crust
    American Geophysical Union (AGU) ; 1991
    In:  Reviews of Geophysics Vol. 29, No. 3 ( 1991-08), p. 279-316
    Details
    In: Reviews of Geophysics, American Geophysical Union (AGU), Vol. 29, No. 3 ( 1991-08), p. 279-316
    Abstract: At ocean margins where two plates converge, the oceanic plate sinks or is subducted beneath an upper one topped by a layer of terrestrial crust. This crust is constructed of continental or island arc material. The subduction process either builds juvenile masses of terrestrial crust through arc volcanism or new areas of crust through the piling up of accretionary masses (prisms) of sedimentary deposits and fragments of thicker crustal bodies scraped off the subducting lower plate. At convergent margins, terrestrial material can also bypass the accretionary prism as a result of sediment subduction, and terrestrial matter can be removed from the upper plate by processes of subduction erosion. Sediment subduction occurs where sediment remains attached to the subducting oceanic plate and underthrusts the seaward position of the upper plate's resistive buttress (backstop) of consolidated sediment and rock. Sediment subduction occurs at two types of convergent margins: type 1 margins where accretionary prisms form and type 2 margins where little net accretion takes place. At type 2 margins (∼19,000 km in global length), effectively all incoming sediment is subducted beneath the massif of basement or framework rocks forming the landward trench slope. At accreting or type 1 margins, sediment subduction begins at the seaward position of an active buttress of consolidated accretionary material that accumulated in front of a starting or core buttress of framework rocks. Where small‐to‐medium‐sized prisms have formed (∼16,300 km), approximately 20% of the incoming sediment is skimmed off a detachment surface or decollement and frontally accreted to the active buttress. The remaining 80% subducts beneath the buttress and may either underplate older parts of the frontal body or bypass the prism entirely and underthrust the leading edge of the margin's rock framework. At margins bordered by large prisms (∼8,200 km), roughly 70% of the incoming trench floor section is subducted beneath the frontal accretionary body and its active buttress. In rounded figures the contemporary rate of solid‐volume sediment subduction at convergent ocean margins (∼43,500 km) is calculated to be 1.5 km³/yr. Correcting type 1 margins for high rates of terrigenous seafloor sedimentation during the past 30 m.y. or so sets the long‐term rate of sediment subduction at 1.0 km³/yr. The bulk of the subducted material is derived directly or indirectly from continental denudation. Interstitial water currently expulsed from accreted and deeply subducted sediment and recycled to the ocean basins is estimated at 0.9 km³/yr. The thinning and truncation caused by subduction erosion of the margin's framework rock and overlying sedimentary deposits have been demonstrated at many convergent margins but only off northern Japan, central Peru, and northern Chile has sufficient information been collected to determine average or long‐term rates, which range from 25 to 50 km³/m.y. per kilometer of margin. A conservative long‐term rate applicable to many sectors of convergent margins is 30 km³/km/m.y. If applied to the length of type 2 margins, subduction erosion removes and transports approximately 0.6 km³/yr of upper plate material to greater depths. At various places, subduction erosion also affects sectors of type 1 margins bordered by small‐ to medium‐sized accretionary prisms (for example, Japan and Peru), thus increasing the global rate by possibly 0.5 km³/yr to a total of 1.1 km³/yr. Little information is available to assess subduction erosion at margins bordered by large accretionary prisms. Mass balance calculations allow assessments to be made of the amount of subducted sediment that bypasses the prism and underthrusts the margin's rock framework. This subcrustally subducted sediment is estimated at 0.7 km³/yr. Combined with the range of terrestrial matter removed from the margin's rock framework by subduction erosion, the global volume of subcrustally subducted material is estimated to range from 1.3 to 1.8 km³/yr. Subcrustally subducted material is either returned to the terrestrial crust by arc‐related igneous processes or crustal underplating or is lost from the crust by mantle absorption. Geochemical and isotopic data support the notion that upper mantle melting returns only a small percent of the subducted material to the terrestrial crust as arc igneous rocks. Limited areal exposures of terrestrial rocks metamorphosed at deep ( 〉 20–30 km) subcrustal pressures and temperatures imply that only a small fraction of subducted material is reattached via deep crustal underplating. Possibly, therefore much of the subducted terrestrial material is recycled to the mantle at a rate near 1.6 km³/yr, which is effectively equivalent to the commonly estimated rate at which the mantle adds juvenile igneous material to the Earth's layer of terrestrial rock.
    Type of Medium: Online Resource
    ISSN: 8755-1209 , 1944-9208
    URL: Article
    DOI: 10.1029/91RG00969
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1991
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  • 7
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    Online Resource
    Neotectonic deformation of the central Chile margin: Deepwater forearc basin formation in response to hot spot ridge and seamount subduction : DEEPWATER FOREARC BASIN FORMATION, CENTRAL CHILE
    American Geophysical Union (AGU) ; 2002
    In:  Tectonics Vol. 21, No. 5 ( 2002-10), p. 2-1-2-27
    Details
    In: Tectonics, American Geophysical Union (AGU), Vol. 21, No. 5 ( 2002-10), p. 2-1-2-27
    Type of Medium: Online Resource
    ISSN: 0278-7407
    URL: Article
    DOI: 10.1029/2001TC901023
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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  • 8
    Online Resource
    Online Resource
    Heat flow and thermal structure of the Washington-Oregon accretionary prism-A study of the lower slope
    American Geophysical Union (AGU) ; 1988
    In:  Geophysical Research Letters Vol. 15, No. 10 ( 1988-09), p. 1113-1116
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 15, No. 10 ( 1988-09), p. 1113-1116
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/GL015i010p01113
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1988
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    SSG: 16,13
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  • 9
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    Interplate seismicity at the CRISP drilling site: The 2002 Mw 6.4 Osa Earthquake at the southeastern end of the Middle America Trench
    American Geophysical Union (AGU) ; 2014
    In:  Geochemistry, Geophysics, Geosystems Vol. 15, No. 7 ( 2014-07), p. 3035-3050
    Details
    In: Geochemistry, Geophysics, Geosystems, American Geophysical Union (AGU), Vol. 15, No. 7 ( 2014-07), p. 3035-3050
    Abstract: A large subduction earthquake located in the area of interplate drilling project Most of the seismic energy was radiated at shallow depth below the margin slope Cocos Ridge subduction creates conditions for shallower interplate seismogenesis
    Type of Medium: Online Resource
    ISSN: 1525-2027 , 1525-2027
    URL: Issue
    URL: Article
    DOI: 10.1002/ggge.v15.7
    DOI: 10.1002/2014GC005359
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2014
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  • 10
    Online Resource
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    High density of structurally controlled, shallow to deep water fluid seep indicators imaged offshore Costa Rica
    American Geophysical Union (AGU) ; 2013
    In:  Geochemistry, Geophysics, Geosystems Vol. 14, No. 3 ( 2013-03), p. 519-539
    Details
    In: Geochemistry, Geophysics, Geosystems, American Geophysical Union (AGU), Vol. 14, No. 3 ( 2013-03), p. 519-539
    Abstract: High density of fluid seep indicators discovered off Central America Potential seeps are structurally controlled, many by faults
    Type of Medium: Online Resource
    ISSN: 1525-2027 , 1525-2027
    URL: Issue
    URL: Article
    DOI: 10.1002/ggge.v14.3
    DOI: 10.1002/ggge.20058
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2013
    detail.hit.zdb_id: 2027201-7
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