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  • 2000-2004  (16)
  • 1
    Book
    Book
    Crustal structure along the central Sunda margin, Indonesia (2001)
    Details Availability
    Keywords: Crustal structure ; Sunda Margin ; Dissertation ; Hochschulschrift
    Description / Table of Contents: Abstract ; Zs.-Fassung
    Type of Medium: Book
    Pages: 138, X, III S. , Ill., graph. Darst., Kt.
    URL: http://e-diss.uni-kiel.de/diss_439/
    Language: English
    Note: Kiel, Univ., Diss., 2001
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  • 2
    Online Resource
    Online Resource
    Crustal structure of the Peruvian continental margin from wide-angle seismic studies (2004)
    Associated volumes
    Details Availability
    In: Geophysical journal international, Oxford : Oxford Univ. Press, 1958, 159(2004), 2, Seite 749-764, 1365-246X
    In: volume:159
    In: year:2004
    In: number:2
    In: pages:749-764
    Description / Table of Contents: Active seismic investigations along the Pacific margin off Peru were carried out using ocean bottom hydrophones and seismometers. The structure and the P-wave velocities of the obliquely subducting oceanic Nazca Plate and overriding South American Plate from 8°S to 15°S were determined by modelling the wide-angle seismic data combined with the analysis of reflection seismic data. Three detailed cross-sections of the subduction zone of the Peruvian margin and one strike-line across the Lima Basin are presented here. The oceanic crust of the Nazca Plate, with a thin pelagic sediment cover, ranging from 0-200 m, has an average thickness of 6.4 km. At 8°S it thins to 4 km in the area of Trujillo Trough, a graben-like structure. Across the margin, the plate boundary can be traced to 25 km depth. As inferred from the velocity models, a frontal prism exists adjacent to the trench axis and is associated with the steep lower slope. Terrigeneous sediments are proposed to be transported downslope due to gravitational forces and comprise the frontal prism, characterized by low seismic P-wave velocities. The lower slope material accretes against a backstop structure, which is defined by higher seismic P-wave velocities, 3.5-6.0 km s-1. The large variations in surface slope along one transect may reflect basal removal of upper plate material, thus steepening the slope surface. Subduction processes along the Peruvian margin are dominated by tectonic erosion indicated by the large margin taper, the shape and bending of the subducting slab, laterally varying slope angles and the material properties of the overriding continental plate. The erosional mechanisms, frontal and basal erosion, result in the steepening of the slope and consequent slope failure.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1365-246X
    DOI: 10.1111/j.1365-246X.2004.02425.x
    Language: English
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  • 3
    Book
    Book
    FS-Sonne-Fahrtbericht : = Cruise report SO176 & SO179 : Meramex I & II ; Merapi Amphibious Experiment ; Cilacap-Hongkong & Jakarta-Cilacap, 18.05.- 01.06.04 & 16.09.- 07.10.04 (2004)
    Kiel : IFM-GEOMAR
    Details Availability
    Keywords: Ozeanographie ; Seismik ; Fahrtbericht ; Forschungsbericht ; Java ; Kontinentalrand ; Geophysik ; Sonne
    Description / Table of Contents: Die FS SONNE Fahrten SO176&179 hatten zum Ziel geophysikalische Daten vor Java am Kontinentalrand und der angrenzenden ozeanischen Platte zu gewinnen. Damit sollen Beiträge zum besseren Verständnis zu wichtigen Fragen der Mechanik und der Entwicklung des Kontinentalrandes bei der Plattenkonvergenz geleistet werden. Im Rahmen des BMBF/DFG Sonderprogramms Geotechnologien - Kontinentränder wurde das interdisziplinäre Verbundvorhaben SUNDAARC in 2004 begonnen. Innerhalb der SUNDAARC Initiative konzentriert sich das Teilprojekt MERAMEX mit geophysikalischen Verfahren auf die bekannte seismische Lücke bei 110° Ost in der Java Subduktionszone und den Merapi Vulkan. Während der ersten Fahrt, SO176, im Mai 2004 wurden insgesamt vierzehn Ozeanbodenseismometer abgesetzt, um die natürliche Seismizität aufzuzeichnen; diese Stationen ergänzten ein 120 Stationen umfassendes Netz an Land. Diese Stationen wurden zwischen dem 20040518 und 20040520 von der SONNE abgesetzt. Während der zweiten Fahrt, SO179, vom 20040917 bis 20041006 wurden vier seismische Profile abgeschlossen. Zwei dieser Profile waren speziell auf das amphibische seismologische ausgerichtet, während die beiden übrigen dazu dienten, die Krustenstruktur des Kontinentalrandes und der ozeanischen Kruste zu erfassen. Insgesamt wurden 75 OBH/S Positionen besetzt, und die Airgunschlüsse entlang von ca 1000 km abgefahren. Gravimetrie und Bathymetrie wurden kontinuierlich aufgezeichnet, magnetische Daten dagegen nur auf den seismischen Profilen und auf längeren Transitstrecken, insgesamt ca 3000 km. Die gewonnenen Daten sind generell von guter Qualität und werden es erlauben, die gesteckten Ziele zu erreichen. (AUT)
    Type of Medium: Book
    Pages: II, 206 S. , Ill., graph. Darst., Kt.
    Series Statement: IFM-GEOMAR-Report 1
    URL: http://www.gbv.de/dms/goettingen/471707538.pdf
    Language: English , German
    Note: Literaturverz. S. 159 -164 , Zsfassung in dt. und engl. Sprache
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  • 4
    Online Resource
    Online Resource
    Crustal structure along the central Sunda margin, Indonesia (2001)
    Kiel
    Details Availability
    Keywords: Crustal structure ; Sunda Margin ; Dissertation ; Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource ( 167Seiten = 77MB) , Ill., graph. Darst., Kt.
    URL: https://oceanrep.geomar.de/id/eprint/31069/
    Language: English
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  • 5
    Online Resource
    Online Resource
    Crustal structure along the central Sunda margin, Indonesia (2001)
    Details Availability
    Keywords: Crustal structure ; Sunda Margin ; Dissertation ; Hochschulschrift
    Description / Table of Contents: Abstract ; Zs.-Fassung
    Type of Medium: Online Resource
    Pages: Online-Ressource (138, X, III S = 76.61 MB, Text) , Ill., graph. Darst., Kt.
    Edition: [Electronic ed.]
    URL: http://macau.uni-kiel.de/receive/dissertation_diss_00000439
    URL: http://nbn-resolving.de/urn:nbn:de:gbv:8-diss-4395
    URN: urn:nbn:de:gbv:8-diss-4395
    Language: English
    Note: Kiel, Univ., Diss., 2001
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  • 6
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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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  • 7
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    Geophysical investigations of the Java margin, Indonesia (2004)
    In:  Intermargins Newsletter, 5 . pp. 7-9.
    Details
    Publication Date: 2018-07-04
    Type: Article , NonPeerReviewed
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    OceanRep: Article in a Scientific Journal - without review
  • 8
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    Crustal structure of the Java margin from seismic wide-angle and multichannel reflection data (2002)
    AGU (American Geophysical Union)
    In:  Journal of Geophysical Research: Solid Earth, 107 (B2). p. 2034.
    Details
    Publication Date: 2018-04-25
    Description: Seismic investigations across the convergent Sunda margin off Indonesia provide a detailed image of the crustal architecture of the Sunda plate boundary. The combined analysis and interpretation of wide-angle and reflection seismic data along two coincident profiles across the subduction zone are complemented by additional lines within the forearc domain, which yield some three-dimensional (3-D) constraints on the velocity-depth structure across the margin. A detailed cross section of the subduction zone is presented, which is confirmed by supplementary gravity modeling. The Sunda convergence zone is a prime example of an accretionary margin, where sediment accretion has led to the formation of a massive accretionary prism, with a total width of 〉110 km between the trench and the forearc basin. It is composed of a frontal wedge which documents ongoing accretion and a fossil part behind the present backstop structure which constitutes the outer high. Moderate seismic velocities derived from wide-angle modeling indicate a sedimentary composition of the outer high. The subducting oceanic slab is traced to a depth of almost 30 km underneath the accretionary prism. The adjacent forearc domain is characterized by a pronounced morphological basin which is underlain by a layer of increased seismic velocities and a shallow upper plate Moho at 16 km depth. We speculate that remnant fragments of oceanic crust might be involved in the formation of this oceanic-type crust found at the leading edge of the upper plate beneath the forearc basin.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2000JB000095
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  • 9
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    BSR occurrence along the Sunda margin: evidence from seismic data (2002)
    Elsevier
    In:  Earth and Planetary Science Letters, 197 . pp. 225-235.
    Details
    Publication Date: 2016-11-15
    Description: The occurrence of bottom simulating reflections (BSRs) along the Sunda margin off Indonesia is investigated for the first time using seismic reflection data from three surveys conducted across the subduction zone and the forearc domain off southern Sumatra to central Java. BSRs commonly concur with the base of the thermodynamically stable hydrate zone and are thus an important indicator for gas hydrates. Along the Sunda Arc, BSR occurrence is restricted to the forearc domain in regions likely to represent a focussing of fluid flow, such as the forearc basin slopes or anticline structures. Dissociation of gas hydrates due to uplift along anticline structures may be an important secondary cause of BSR formation. The absence of BSRs in the forearc basin center despite continuous sedimentation to ensure carbon supply may be related to the very high sedimentation rate (〉0.4 km/Ma) which causes unused carbon to pass through the stability zone even for a high rate constant of methanogenesis. In addition, the interbedding of low- and high-permeability layers renders fluid flow across layering ineffective. No BSR phases could be detected along the accretionary prism or the outer high, although the P–T regime would allow a potential BSR to lie within the accretionary sedimentary column.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0012-821X(02)00484-3
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  • 10
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    Crustal structure of the Peruvian continental margin from wide-angle seismic studies (2004)
    Wiley
    In:  Geophysical Journal International, 158 (2). pp. 749-764.
    Details
    Publication Date: 2018-07-17
    Description: Active seismic investigations along the Pacific margin off Peru were carried out using ocean bottom hydrophones and seismometers. The structure and the P-wave velocities of the obliquely subducting oceanic Nazca Plate and overriding South American Plate from 8°S to 15°S were determined by modelling the wide-angle seismic data combined with the analysis of reflection seismic data. Three detailed cross-sections of the subduction zone of the Peruvian margin and one strike-line across the Lima Basin are presented here. The oceanic crust of the Nazca Plate, with a thin pelagic sediment cover, ranging from 0–200 m, has an average thickness of 6.4 km. At 8°S it thins to 4 km in the area of Trujillo Trough, a graben-like structure. Across the margin, the plate boundary can be traced to 25 km depth. As inferred from the velocity models, a frontal prism exists adjacent to the trench axis and is associated with the steep lower slope. Terrigeneous sediments are proposed to be transported downslope due to gravitational forces and comprise the frontal prism, characterized by low seismic P-wave velocities. The lower slope material accretes against a backstop structure, which is defined by higher seismic P-wave velocities, 3.5–6.0 km s−1. The large variations in surface slope along one transect may reflect basal removal of upper plate material, thus steepening the slope surface. Subduction processes along the Peruvian margin are dominated by tectonic erosion indicated by the large margin taper, the shape and bending of the subducting slab, laterally varying slope angles and the material properties of the overriding continental plate. The erosional mechanisms, frontal and basal erosion, result in the steepening of the slope and consequent slope failure.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.1365-246X.2004.02425.x
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