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  • 1
    Online Resource
    Online Resource
    Tectonic control on sediment accretion and subduction off south central Chile: Implications for coseismic rupture processes of the 1960 and 2010 megathrust earthquakes : SEDIMENT SUBDUCTION AND ACCRETION
    American Geophysical Union (AGU) ; 2010
    In:  Tectonics Vol. 29, No. 6 ( 2010-12), p. n/a-n/a
    Details
    In: Tectonics, American Geophysical Union (AGU), Vol. 29, No. 6 ( 2010-12), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0278-7407
    URL: Article
    DOI: 10.1029/2010TC002734
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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  • 2
    Online Resource
    Online Resource
    Lithospheric structure of the Costa Rican Isthmus: Effects of subduction zone magmatism on an oceanic plateau
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Solid Earth Vol. 106, No. B1 ( 2001-01-10), p. 621-643
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 106, No. B1 ( 2001-01-10), p. 621-643
    Abstract: We present the results of a multidisciplinary geophysical study, conducted to investigate the lithospheric structure of the Costa Rican Isthmus. The physical properties of the lithosphere are resolved by three‐dimensional (3‐D) simultaneous inversion of velocity anomalies and hypocenter parameters using local earthquakes and 2‐D forward modeling of onshore and offshore seismic refraction and gravity data. According to our results, the northern half of the Costa Rican Isthmus is constituted by a ∼40‐km‐thick crust, with a 6‐ to 7‐km‐thick oceanic crust subducting under it. The uppermost level of the basement and most of the marginal wedge show intermediate velocities and high densities, in good agreement with those described for flood basalts. The midlevel shows velocities and densities representative of oceanic crust. The bottommost level (20–40 km) shows high velocities and densities, typical of mafic rocks, and the upper mantle displays anomalously low densities and velocities. Intracrustal heterogeneities at intermediate wavelengths are indicated by prominent velocity anomalies. These results are consistent with a basement beneath the Costa Rican Isthmus being part of the Caribbean plateau, originated at 85–90 Ma with the onset of the Galápagos hotspot. The upper level corresponds to the flood basalts extruded during this phase, and it includes most of the marginal wedge. The second level represents the preexisting oceanic crust. The mafic lower crust, intracrustal heterogeneities, and anomalous upper mantle are interpreted to be built up by underplating, intrusion, and crystallization of basaltic melts, formed under the influence of subducting lithosphere dehydration.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JB900245
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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  • 3
    Online Resource
    Online Resource
    3D simultaneous seismic refraction and reflection tomography of wide-angle data from the Central Chilean Margin
    American Geophysical Union (AGU) ; 1999
    In:  Geophysical Research Letters Vol. 26, No. 16 ( 1999-08-15), p. 2577-2580
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 26, No. 16 ( 1999-08-15), p. 2577-2580
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/1999GL900545
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1999
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    SSG: 16,13
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  • 4
    Online Resource
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    Upper lithospheric structure of the subduction zone offshore of southern Arauco peninsula, Chile, at ∼38°S
    American Geophysical Union (AGU) ; 2008
    In:  Journal of Geophysical Research Vol. 113, No. B7 ( 2008-07-15)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 113, No. B7 ( 2008-07-15)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2007JB005569
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2008
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  • 5
    Online Resource
    Online Resource
    Reactivation of tectonics, crustal underplating, and uplift after 60 Myr of passive subsidence, Raukumara Basin, Hikurangi-Kermadec fore arc, New Zealand: Implications for global growth and recycling of continents : RAUKUMARA BASIN, NZ
    American Geophysical Union (AGU) ; 2009
    In:  Tectonics Vol. 28, No. 5 ( 2009-10), p. n/a-n/a
    Details
    In: Tectonics, American Geophysical Union (AGU), Vol. 28, No. 5 ( 2009-10), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0278-7407
    URL: Article
    DOI: 10.1029/2008TC002356
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2009
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  • 6
    Online Resource
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    Constraints on the shallow seismic structure at Ocean Drilling Program Site 1107, Ninetyeast Ridge, from implosive bottom sources and airgun shots
    American Geophysical Union (AGU) ; 1999
    In:  Geophysical Research Letters Vol. 26, No. 7 ( 1999-04-01), p. 907-910
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 26, No. 7 ( 1999-04-01), p. 907-910
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/1999GL900151
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1999
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Crustal structure of the Chugach Mountains, southern Alaska: A study of peg‐leg multiples from a low‐velocity zone
    American Geophysical Union (AGU) ; 1989
    In:  Journal of Geophysical Research: Solid Earth Vol. 94, No. B11 ( 1989-11-10), p. 16023-16035
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 94, No. B11 ( 1989-11-10), p. 16023-16035
    Abstract: 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 within 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 zone wherein 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 of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB094iB11p16023
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1989
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  • 8
    Online Resource
    Online Resource
    Alteration of the subducting oceanic lithosphere at the southern central Chile trench-outer rise : OCEANIC LITHOSPHERE, CHILE
    American Geophysical Union (AGU) ; 2007
    In:  Geochemistry, Geophysics, Geosystems Vol. 8, No. 7 ( 2007-07), p. n/a-n/a
    Details
    In: Geochemistry, Geophysics, Geosystems, American Geophysical Union (AGU), Vol. 8, No. 7 ( 2007-07), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 1525-2027
    URL: Article
    DOI: 10.1029/2007GC001632
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2007
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  • 9
    Online Resource
    Online Resource
    Deep seismic structure of the Tonga subduction zone: Implications for mantle hydration, tectonic erosion, and arc magmatism
    American Geophysical Union (AGU) ; 2011
    In:  Journal of Geophysical Research Vol. 116, No. B10 ( 2011-10-13)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 116, No. B10 ( 2011-10-13)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2011JB008434
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
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  • 10
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    Near‐vertical and intermediate offset seismic reflection data from west of the Whipple Mountains, SE California
    American Geophysical Union (AGU) ; 1989
    In:  Journal of Geophysical Research: Solid Earth Vol. 94, No. B1 ( 1989-01-10), p. 625-636
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 94, No. B1 ( 1989-01-10), p. 625-636
    Abstract: 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 of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/JB094iB01p00625
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1989
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