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  • Elsevier  (4)
  • Wiley  (4)
  • Kiel : GEOMAR, Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel  (3)
  • 2000-2004  (11)
  • 1
    Online Resource
    Online Resource
    Panama basin and Galápagos Plume, New INvestigations of Intraplate magmatism ; SO 144 ; Abschlußbericht 2002 ; Berichtszeitraum: 1. Juli 1999 bis 31. Dezember 2001 ; PAGANINI (2002)
    Kiel : GEOMAR, Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource ([14] p. = 61,0 KB)
    Edition: [Elektronische Ressource]
    URL: https://edocs.tib.eu/files/e01fb02/358018102.pdf
    URL: https://edocs.tib.eu/files/e01fb02/358018102l.pdf
    Language: German , English
    Note: Contract BMBF 03G144 A. - Differences between the printed and electronic version of the document are possible. - nBibliography p. [8] - [10] , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 2
    Online Resource
    Online Resource
    HULA-II : Interdisziplinäre Untersuchungen zur zeitlichen Einordung des Hawaii-Emperor Knicks und dem Ursprung von Lithosphären Anomalien an der Musicians Seamount Kette ; SO 142 ; Abschlußbericht 2002 ; Berichtszeitraum: 1. Mai 1999 bis 31. Dezember 2001 (2002)
    Kiel : GEOMAR, Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: Hot spot volcanism, Musicians Seamounts, Italian Ridge, Bach Ridge, Crustal Structure, Ocean bottom hydrophones
    Type of Medium: Online Resource
    Pages: Online-Ressource ([10] p. = 57,6 KB)
    Edition: [Elektronische Ressource]
    URL: https://edocs.tib.eu/files/e01fb02/358017491.pdf
    URL: https://edocs.tib.eu/files/e01fb02/358017491l.pdf
    Language: German , English
    Note: Contract BMBF 03G142A. - Differences between the printed and electronic version of the document are possible. - Engl. abstract under title: SO 142-HULA II: Interdisciplinary investigations on the timing of the Hawaii-emperor bend and the origin of lithospheric anomalies along the musician seamount chain. - nBibliography p. [5] - [6]. - nIndex p. 7 , Also available as printed version , Systemvoraussetzungen: Acrobat Reader.
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  • 3
    Book
    Book
    Panama Basin and Galapagos Plume - new Investigations of Intraplate Magmatism : SO144 ; Abschlußbericht 2002 ; Berichtszeitraum: 1. Juli 1999 bis 31. Dezember 2001 ; PAGANINI (2002)
    Kiel : GEOMAR, Forschungszentrum für Marine Geowissenschaften an der Christian-Albrechts-Universität zu Kiel
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: Galápagos Islands, East Pacific, hotspot, plume-ridge interaction, geochemistry, volcanology, magnetic anomalies, morphology
    Type of Medium: Book
    Pages: Getr. Zählung, [296] S. , Ill., graph. Darst., Kt.
    Language: English , German
    Note: Förderkennzeichen BMBF 03 G 144 A , Text teils dt., überw. in engl. Sprache , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Teilweise auch als elektronische Ressource vorh
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  • 4
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    Crustal structure of the central Sunda margin at the onset of oblique subduction (2001)
    Wiley
    In:  Geophysical Journal International, 147 (2). pp. 449-474.
    Details
    Publication Date: 2018-07-16
    Description: The convergent margin of the central Sunda Arc in Indonesia was the target of a reflection and refraction seismic survey conducted in 1998 and 1999. Along two seismic lines across the subduction complex off southern Sumatra and off Sunda Strait, coincident multichannel and wide-angle data were collected, complemented by two refraction strike-lines in the forearc basin off Sumatra. The combined analysis of the acquired data allows us to present a detailed model of the subduction zone where initiation of strain partitioning occurs due to the onset of oblique subduction. The dip of the subducted plate is well defined along both dip-lines and a lateral increase from 5° to 7° from beneath the outer high off Sumatra to Sunda Strait is supported by complementary gravity modelling. The downgoing slab is traced to a depth of more than 30km. On both reflection dip-lines, a clearly developed backstop structure underlying a trench slope break defines the landward termination of the active accretionary prism and separates it from the outer high. Active subduction accretion is supported by laterally increasing velocities between the deformation front and the active backstop structure. Seismic velocities of the outer high are moderate along both lines (〈5.8kms−1 at 20km depth), suggesting a sedimentary composition. Reduced reflectivity beneath a rugged top basement traced along the outer high of both dip-lines supports a high degree of deformation and material compaction. Several kilometres of sediment has accumulated in the forearc domain, although a distinct morphological basin is only recognized off southern Sumatra and is not developed off Sunda Strait. The bathymetric elevation of the Java shelf that is encountered in the southern Sunda Strait corresponds to increased velocities of a basement high there and is connected to extensional structures of the Sunda Strait transtensional basin. Differences observed in the morphology of the forearc domain are also reflected in the lower crustal structure. Off southern Sumatra, the velocity–depth model clearly indicates a continental-type crust underlying the forearc basin, whereas lower velocities are found beneath the Sunda Strait forearc domain. Off Sumatra, some 3-D constraint on the upper plate structure is gained from the refraction strike-lines, which in addition is supported by synthetic data modelling.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.0956-540x.2001.01547.x
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  • 5
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    Crustal underplating and its implications for subsidence and state of isostasy along the Ninetyeast Ridge hotspot trail (2000)
    Wiley
    In:  Geophysical Journal International, 142 (2). pp. 643-649.
    Details
    Publication Date: 2018-01-31
    Description: Recent seismic field work has revealed high lower-crustal velocities under Ninetyeast Ridge, Indian Ocean, indicating the presence of crustal underplating (Grevemeyer et al. 2000). We used results from Ocean Drilling Program (ODP) drill cores and cross-spectral analysis of gravity and bathymetric data to study the impact of the underplating body on the subsidence history and the mode of isostatic compensation along Ninetyeast Ridge. Compared with the adjacent Indian basin, the subsidence of Ninetyeast Ridge is profoundly anomalous. Within the first few millions of years after crustal emplacement the ridge subsided rapidly. Thereafter, however, subsidence slowed down significantly. The most reliable model of isostasy suggests loading of a thin elastic plate on and beneath the seafloor. Isostatic compensation of subsurface loading occurs at a depth of about 25km, which is in reasonably good agreement with seismic constraints. Subsurface loading is inherently associated with buoyant forces acting on the lithosphere. The low subsidence may therefore be the superposition of cooling of the lithosphere and uplift due to buoyant material added at the base of the crust. A model including prolonged crustal growth in the form of subcrustal plutonism may account for all observations.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1365-246x.2000.00154.x
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  • 6
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    Crustal architecture and deep structure of the Ninetyeast Ridge hotspot trail from active-source ocean bottom seismology (2001)
    Wiley
    In:  Geophysical Journal International, 144 (2). pp. 414-431.
    Details
    Publication Date: 2018-01-31
    Description: A 550-km-long transect across the Ninetyeast Ridge, a major Indian ocean hotspot trail, provided seismic refraction and wide-angle reflection data recorded on 60 ocean bottom instruments. About 24 000 crustal and 15 000 upper mantle arrivals have been picked and used to derive an image of the hotspot track. Two approaches have been chosen: (i) a first-arrival tomographic inversion yielding crustal properties; and (ii) forward modelling of mantle phases revealing the structure at the crust–mantle boundary region and of the uppermost mantle. Away from the volcanic edifice, seismic recordings show the typical phases from oceanic crust, that is, two crustal refraction branches (Pg), a wide-angle reflection from the crust–mantle boundary (PmP) and a wave group turning within the upper mantle (Pn). Approaching the edifice, three additional phases have been detected. We interpret these arrivals as a wide-angle reflection from the base of material trapped under the pre-hotspot crust (Pm2P) and as a wide-angle reflection (PnP) and its associated refraction branch (PN) from a layered upper mantle. The resulting models indicate normal oceanic crust to the west and east of the edifice. Crustal thickness averages 6.5–7 km. Wide-angle reflections from both the pre-hotspot and the post-hotspot crust–mantle boundary suggest that the crust under the ridge has been bent downwards by loading the lithosphere, and hotspot volcanism has underplated the pre-existing crust with material characterized by seismic velocities intermediate between those of mafic lower crustal and ultramafic upper mantle rocks (7.5–7.6 km s−1). In total, the crust is up to ≈ 24 km thick. The ratio between the volume of subcrustal plutonism forming the underplate and extrusive and intrusive volcanism forming the edifice is about 0.7. An important observation is that underplating continued to the east under the Wharton Basin. During the shield-building phase, however, Ninetyeast Ridge was located adjacent to the Broken Ridge and was subsequently pulled apart along a transform fault boundary. Therefore, underplating eastwards of the fracture zone separating the edifice from the Wharton Basin suggests that prolonged crustal growth by subcrustal plutonism occurred over millions of years after the major shield-building stage. This fact, however, requires mantle flow along the fossil hotspot trail. The occurrence of PnP and PN arrivals is probably associated with a layered and anisotropic upper mantle due to the preferential alignment of olivine crystals and may have formed by rising plume material which spread away under the base of the lithosphere.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.0956-540X.2000.01334.x
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  • 7
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    The continental margin off Oregon from seismic investigations (2000)
    Elsevier
    In:  Tectonophysics, 329 (1-4). pp. 79-97.
    Details
    Publication Date: 2018-01-05
    Description: In April and May 1996, a geophysical study of the Cascadia continental margin off Oregon and Washington was carried out aboard the German RV Sonne as a cooperative experiment between GEOMAR, the USGS and COAS. Offshore central Oregon, which is the subject of this study, the experiment involved the collection of wide-angle refraction and reflection data along three profiles across the continental margin using ocean-bottom seismometers (OBS) and hydrophones (OBH) as well as land recorders. Two-dimensional modelling of the travel times provides a detailed velocity structure beneath these profiles. The subducting oceanic crust of the Juan de Fuca plate can be traced from the trench to its position some 10 km landward of the coastline. At the coastline, the Moho has a depth of 30 km. The dip of the plate changes from 1.5° westward of the trench to about 6.5° below the accretionary complex and to about 16° further eastward below the coast. The backstop forming western edge of the Siletz terrane, an oceanic plateau that was accreted to North America about 50 Ma ago, is well defined by the observations. It is located about 60 km to the east of the deformation front and has a seaward dip of 40°. At its seaward edge, the base of the Siletz terrane seems to be in contact with the subducting oceanic crust implying that sediments are unlikely to be subducted to greater depths. The upper oceanic crust is thinner to the east of this contact than to the west. At depths greater than 18 km, the top of the oceanic crust is the origin of pre-critical reflections observable in several land recordings and in the data of one ocean bottom instrument. These reflections are most likely caused by fluids that are released from the oceanic crust by metamorphic facies transition.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0040-1951(00)00190-6
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  • 8
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    Ocean-bottom seismology in the third millennium (2002)
    Elsevier
    In:  In: Science technology synergy for research in the marine environment: challanges for the XXI century. , ed. by Beranzoli, L., Favali, P. and Smriglio, G. Developments in marine technology, 12 . Elsevier, Amsterdam, Netherlands, pp. 37-44. ISBN 0-444-50591-1
    Details
    Publication Date: 2020-08-03
    Description: Marine seismic wide-angle data acquisition and earthquake seismology observations are at the verge of a quantum leap in data quality and density. Advances in micro-electronic technology facilitates the construction of instrumcnts that enable large data volumes to be collected and that are small and cheap enough so that large numbers can be built and operated economically. The main improvements are a dramatic decrease of power consumption ( 〈 250 m W) and increase in clock stability ( 〈 0.05 ppm}. Several scenarios for future experiments arc discussed in this contrihution
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 9
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    Three-dimensional seismic refraction tomography of the crustal structure at the ION site on the Ninetyeast Ridge, Indian Ocean (2003)
    Wiley
    In:  Geophysical Journal International, 152 (1). pp. 171-184.
    Details
    Publication Date: 2018-07-17
    Description: We have performed a 3-D seismic refraction tomography of a 48 × 48 km2 area surrounding ODP site 757, which is planned to host an International Ocean Network (ION) permanent seismological observatory, called the Ninetyeast Ridge Observatory (NERO). The study area is located in the southern part of the Ninetyeast Ridge, the trail left by the Kerguelen hotspot on the Indian plate. The GEOMAR Research Centre for Marine Geosciences and the Federal Institute for Geosciences and Natural Resources acquired 18 wide-angle profiles recorded by 23 ocean bottom hydrophones during cruise SO131 of R/V Sonne in spring 1998. We apply a first arrival traveltime tomography technique using regularized inversion to recover the 3-D velocity structure relative to a 1-D background model that was constructed from a priori information and averaged traveltime data. The final velocity model revealed the crustal structure down to approximately 8 km depth. Resolution tests showed that structures with approximately 6 km horizontal extent can reliably be resolved down to that depth. The survey imaged the extrusive layer of the upper crust of the Ninetyeast Ridge, which varies in thickness between 3 and 4 km. A high-velocity anomaly coinciding with a positive magnetic anomaly represents a volcanic centre from which crust in this area is thought to have formed. A pronounced low-velocity anomaly is located underneath a thick sedimentary cover in a bathymetric depression. However, poor ray coverage of the uppermost kilometre of the crust in this area resulted in smearing of the shallow structure to a larger depth. Tests explicitly including the shallow low-velocity layer confirmed the existence of the deeper structure. The heterogeneity of the upper crust as observed by our study will have consequences for the waveforms of earthquake signals to be recorded by the future seismic observatory.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1046/j.1365-246X.2003.01838.x
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  • 10
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    Single-frame multiparameter platforms for seafloor geophysical and environmental observations: projects and missons from GEOSTAR to ORION (2002)
    Elsevier
    In:  In: Science Technology Synergy for Research in the Marine Environment: Challenges for the XXI Century. , ed. by Beranzoli, L., Favali, P. and Smirglio, G. Developments in marine technology, 12 . Elsevier, Amsterdam, Netherlands, p. 2000. ISBN 0-7803-8669-8
    Details
    Publication Date: 2020-05-27
    Description: The paper presents an overview of recent seafloor long-term single-frame multiparameter platform developed in the framework of the European Commission and Italian projects starting from the GEOSTAR prototype. The main features of the different systems are described as well as the sea missions that led to their validation. The ORION seafloor observatory network recently developed, based on the GEOSTAR-type platforms and engaged in a deep-sea mission at 3300 m w.d. in the Mediterranean Sea, is also described
    Type: Book chapter , NonPeerReviewed
    Format: text
    DOI: 10.1109/OCEANS.2004.1406450
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