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  • 1
    Online Resource
    Online Resource
    Newly identified strike-slip plate boundary in the northeastern Arabian Sea
    Geological Society of America ; 2000
    In:  Geology Vol. 28, No. 4 ( 2000), p. 355-
    Details
    In: Geology, Geological Society of America, Vol. 28, No. 4 ( 2000), p. 355-
    Type of Medium: Online Resource
    ISSN: 0091-7613
    URL: Article
    DOI: 10.1130/0091-7613(2000)28〈355:NISPBI〉2.0.CO;2
    Language: English
    Publisher: Geological Society of America
    Publication Date: 2000
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  • 2
    Online Resource
    Online Resource
    Newly identified strike-slip plate boundary in the northeastern Arabian Sea
    Geological Society of America ; 2000
    In:  Geology Vol. 28, No. 4 ( 2000-4), p. 355-358
    Details
    In: Geology, Geological Society of America, Vol. 28, No. 4 ( 2000-4), p. 355-358
    Type of Medium: Online Resource
    ISSN: 0091-7613
    URL: Article
    DOI: 10.1130/0091-7613(2000)028〈0355:NISSPB〉2.3.CO;2
    Language: Unknown
    Publisher: Geological Society of America
    Publication Date: 2000
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  • 3
    Online Resource
    Online Resource
    Estimating the thickness of the free gas zone beneath Hydrate Ridge, Oregon continental margin, from seismic velocities and attenuation
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Solid Earth Vol. 106, No. B2 ( 2001-02-10), p. 2035-2045
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 106, No. B2 ( 2001-02-10), p. 2035-2045
    Abstract: Recent Ocean Drilling Program (ODP) results in the Oregon accretionary prism and on the Blake Ridge indicate that the zone containing free gas beneath the hydrate‐bearing near‐surface sediments is considerably thicker than previously thought. In this paper, we present results from travel time inversion of refracted seismic waves that show very low ( 〈 1.85 km/s) velocities extending for 500–600 m beneath the base of the gas hydrate stability zone in Hydrate Ridge on the Oregon continental margin near ODP site 892. The low‐velocity near‐surface layer extends across Hydrate Ridge and beneath the adjacent continental slope to the east. Because Pliocene sediments are exposed at the crest of Hydrate Ridge in an erosional setting, we suggest that these low velocities indicate the extent of a zone of dispersed free gas rather than recent sedimentation. Strong frequency‐dependent attenuation of amplitudes is observed for P waves crossing this zone. Amplitude spectra, referenced to spectra for similar accretionary complex paths that do not cross the interpreted gassy layer, indicate a very low P wave quality factor ( Q p ) within this zone, with Q p ∼12 compared to Q p 〉 100 in the “normal” accretionary complex sediments west of Hydrate Ridge. These results suggest that refraction seismic techniques are a powerful way to constrain the depth to which free gas is present in sediments beneath the hydrate stability zone. Defining the extent of the free gas zone is an important factor for estimating the total volume of gas present and for evaluating its impact on slope stability and potential contribution to global climate change.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JB900390
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 2969341-X
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    detail.hit.zdb_id: 3094268-8
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    detail.hit.zdb_id: 3094181-7
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    detail.hit.zdb_id: 3094167-2
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    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Local earthquake tomography of shallow subduction in north Chile: A combined onshore and offshore study
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Solid Earth Vol. 105, No. B12 ( 2000-12-10), p. 28183-28198
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 105, No. B12 ( 2000-12-10), p. 28183-28198
    Abstract: Selected travel time data from the aftershock series of the great Antofagasta earthquake (M w = 8.0) have been inverted simultaneously for both hypocenter locations and three‐dimensional V P and V P / V S structure. The data were collected with a dense 44‐station seismic network including ocean bottom hydrophones. We performed a series of inversions with increasing complexity: 1‐D, 2‐D, and 3‐D. This approach was chosen to account for the heterogeneous seismicity distribution and to obtain a smooth regional model in areas of low resolution. Special efforts were made to assess the solution quality including standard resolution estimates and tests with synthetic travel times. The subducted plate is imaged between 20 and 50 km in depth as an eastward dipping high V P feature. High V P / V S ratios within the oceanic crust possibly indicate elevated fluid content. Underplating of material eroded close to the trench is found beneath the Mejillones Peninsula. The lower crust of the overlying plate is characterized by an average V P of 6.8–6.9 km/s and an average to low V P / V S ratio. Large areas of anomalously high V P are found in the lower crust south of the city of Antofagasta; they are interpreted as remants of magmatic intrusions. A zone of high V P / V S ratios is found within the rupture area of the Antofagasta main shock, just above the subducted slab. Its location within the region of highest stress release from the main shock suggests that the main shock rupture causes the high V P / V S ratio. The high V P / V S ratio could indicate postseismic fluid migration from the subducted oceanic crust into the overlying lower crust.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JB900229
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
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    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Crustal structure across the Xisha Trough, northwestern South China Sea
    Elsevier BV ; 2001
    In:  Tectonophysics Vol. 341, No. 1-4 ( 2001-11), p. 179-193
    Details
    In: Tectonophysics, Elsevier BV, Vol. 341, No. 1-4 ( 2001-11), p. 179-193
    Type of Medium: Online Resource
    ISSN: 0040-1951
    URL: Article
    DOI: 10.1016/S0040-1951(01)00222-0
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2001
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    SSG: 16,13
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  • 6
    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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    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
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    detail.hit.zdb_id: 3094167-2
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    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Crustal structure of the central Sunda margin at the onset of oblique subduction
    Oxford University Press (OUP) ; 2001
    In:  Geophysical Journal International Vol. 147, No. 2 ( 2001-11), p. 449-474
    Details
    In: Geophysical Journal International, Oxford University Press (OUP), Vol. 147, No. 2 ( 2001-11), p. 449-474
    Type of Medium: Online Resource
    ISSN: 0956-540X , 1365-246X
    URL: Article
    DOI: 10.1046/j.0956-540x.2001.01547.x
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2001
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    detail.hit.zdb_id: 2006420-2
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    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    Transtensional basins in the Western Sunda Strait
    American Geophysical Union (AGU) ; 2000
    In:  Geophysical Research Letters Vol. 27, No. 21 ( 2000-11), p. 3545-3548
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 27, No. 21 ( 2000-11), p. 3545-3548
    Abstract: In 1999 a marine geophysical survey collected bathymetric imagery, seismic reflection and refraction data to investigate the crustal structure and evolution of the Sunda Strait, which is linked to the obliquely convergent geodynamic setting of the Sumatran trench. The transtensional character of the study area is manifested in faulted blocks of arc basement and active normal faults detected on both sides of a large graben at the western entrance to the Sunda Strait. The combined interpretation of reflection and wide‐angle data reveals over 6 km of sediment graben fill associated with substantial crustal thinning. The southern part of the study region is only 50 km from the trench and the Moho of the downgoing plate is found at a depth of 28 km.
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Article
    DOI: 10.1029/2000GL011635
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2000
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    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Geodetic and seismic constraints on some seismogenic zone processes in Costa Rica : SEISMOGENIC PROCESSES IN COSTA RICA
    American Geophysical Union (AGU) ; 2004
    In:  Journal of Geophysical Research: Solid Earth Vol. 109, No. B11 ( 2004-11)
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 109, No. B11 ( 2004-11)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2003JB002931
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2004
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    detail.hit.zdb_id: 2969341-X
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    detail.hit.zdb_id: 710256-2
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    detail.hit.zdb_id: 2220777-6
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    SSG: 16,13
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  • 10
    Online Resource
    Online Resource
    Morphotectonics and mechanics of the central Makran accretionary wedge off Pakistan
    Elsevier BV ; 2001
    In:  Marine Geology Vol. 173, No. 1-4 ( 2001-03), p. 1-19
    Details
    In: Marine Geology, Elsevier BV, Vol. 173, No. 1-4 ( 2001-03), p. 1-19
    Type of Medium: Online Resource
    ISSN: 0025-3227
    URL: Article
    DOI: 10.1016/S0025-3227(00)00167-5
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2001
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    SSG: 13
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