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  • 1
    Electronic Resource
    Electronic Resource
    3-D Prestack Kirchhoff Migration of the ISO89-3D Data Set (1999)
    Springer
    Pure and applied geophysics 156 (1999), S. 157-171 
    Details
    ISSN: 1420-9136
    Keywords: Key Words: Crustal structure, deep seismic reflection, explosion seismology, 3-D Kirchhoff migration.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract — This paper presents an overview of the results obtained from a 3-D prestack depth migration of the ISO89-3D data set. The algorithm is implemented as a Kirchhoff-type migration, in which the migrated image is generated by weighted summation along diffraction surfaces through the shot record section. The diffraction surfaces are computed by a 3-D finite difference solution of the eikonal equation. A 3-D macro-velocity model derived mainly from wide-angle tomographic inversion served as input for the travel-time calculations. The results of the migration are presented as slices through a volume covering an area of 21 km × 21 km in the horizontal and 15 km in the vertical direction, centered around the KTB drill hole. In these slices the continuation of the Franconian Lineament or SE1 reflector, respectively, can be identified over most of the survey area as a northeast dipping reflector plane. Its signature appears partly curved and discontinuous and with different strength of reflection down to a maximum depth of 9 km. About 5 km to the south-southeast of the KTB drill hole the uppermost top reflection of the Erbendorf body (EB) can be recognized at approximately the same depth. The slices clearly show its complicated internal structure consisting of several apparently separated reflective parts. Moreover, the geometry and the shape of a few other subsurface structures are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050294
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    Paper (German National Licenses)
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  • 2
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    3-D prestack Kirchhoff migration of the ISO89-3D data set (1999)
    In:  Pure and Applied Geophysics 156: 157-171
    Details
    Publication Date: 1999
    Keywords: seismic processing/methodology, ISO 89, KTB, Oberpfalz, Bohemian Massif, reflection seismics
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    CITATION DEKORP
  • 3
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    Seismic P  Wave Velocity Model From 3‐D Surface and Borehole Seismic Data at the Alpine Fault DFDP‐2 Drill Site (Whataroa, New Zealand) (2020)
    American Geophysical Union
    Details
    Publication Date: 2020-04-01
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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    PAPER CURRENT
  • 4
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    3-D Prestack Kirchhoff Migration of the ISO89-3D Data Set (1999)
    Springer
    Details
    Publication Date: 1999-09-01
    Print ISSN: 0033-4553
    Electronic ISSN: 1420-9136
    Topics: Geosciences , Physics
    Published by Springer
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    PAPER CURRENT
  • 5
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    Seismic P Wave Velocity Model From 3-D Surface and Borehole Seismic Data at the Alpine Fault DFDP-2 Drill Site (Whataroa, New Zealand) (2021)
    Details
    Publication Date: 2021-09-24
    Description: The New Zealand Alpine Fault is a major plate boundary that is expected to be close to rupture, allowing a unique study of fault properties prior to a future earthquake. Here we present 3-D seismic data from the DFDP-2 drill site in Whataroa to constrain valley structures that were obscured in previous 2-D seismic data. The new data consist of a 3-D extended vertical seismic profiling (VSP) survey using three-component and fiber optic receivers in the DFDP-2B borehole and a variety of receivers deployed at the surface. The data set enables us to derive a detailed 3-D P wave velocity model by first-arrival traveltime tomography. We identify a 100–460 m thick sediment layer (mean velocity 2,200 ± 400 m/s) above the basement (mean velocity 4,200 ± 500 m/s). Particularly on the western valley side, a region of high velocities rises steeply to the surface and mimics the topography. We interpret this to be the infilled flank of the glacial valley that has been eroded into the basement. In general, the 3-D structures revealed by the velocity model on the hanging wall of the Alpine Fault correlate well with the surface topography and borehole findings. As a reliable velocity model is not only valuable in itself but also crucial for static corrections and migration algorithms, the Whataroa Valley P wave velocity model we have derived will be of great importance for ongoing seismic imaging. Our results highlight the importance of 3-D seismic data for investigating glacial valley structures in general and the Alpine Fault and adjacent structures in particular.
    Keywords: 622.15 ; vertical seismic profiling ; P wave velocity tomography ; distributed acoustic sensing ; Deep Fault Drilling Project ; subglacial valley
    Language: English
    Type: map
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    CITATION GEO-LEO
  • 6
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    Seismic images of the Northern Chilean subduction zone at 19°40′S, prior to the 2014 Iquique earthquake (2021)
    In:  Geophysical Journal International
    Details
    Publication Date: 2021-12-22
    Description: The Northern Chilean subduction zone is characterized by long-term subduction erosion with very little sediment input at the trench and the lack of an accretionary prism. Here, multichannel seismic reflection (MCS) data were acquired as part of the CINCA (Crustal Investigations off- and onshore Nazca Plate/Central Andes) project in 1995. These lines cover among others the central part of the MW 8.1 Iquique earthquake rupture zone before the earthquake occurred on 1 April 2014. We have re-processed one of the lines crossing the updip parts of this earthquake at 19°40′S, close to its hypocentre. After careful data processing and data enhancement, we applied a coherency-based pre-stack depth migration algorithm, yielding a detailed depth image. The resulting depth image shows the subduction interface prior to the Iquique megathrust earthquake down to a depth of approximately 16 km and gives detailed insight into the characteristics of the seismogenic coupling zone. We found significantly varying interplate reflectivity along the plate interface which we interpret to be caused by the comparably strong reflectivity of subducted fluid-rich sediments within the grabens and half-grabens that are predominant in this area due to the subduction-related bending of the oceanic plate. No evidence was found for a subducted seamount associated to the Iquique Ridge along the slab interface at this latitude as interpreted earlier from the same data set. By comparing relocated fore- and aftershock seismicity of the Iquique earthquake with the resulting depth image, we can divide the continental wedge into two domains. First, a frontal unit beneath the lower slope with several eastward dipping back-rotated splay faults but no seismicity in the upper plate as well as along the plate interface. Secondly, a landward unit beneath the middle slope with differing reflectivity that shows significant seismicity in the upper plate as well as along the plate interface. Both units are separated by a large eastward dipping mega splay fault, the root zone of which shows diffuse seismicity, both in the upper plate and at the interface. The identification of a well-defined nearly aseismic frontal unit sheds new light on the interplate locking beneath the lower continental slope and its controls.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 7
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    Investigation of sedimentary deposits in the Atacama desert-Chile using loop source transient electromagnetics (2020)
    In:  Protokoll über das 28. Schmucker-Weidelt-Kolloquium für Elektromagnetische Tiefenforschung : Haltern am See, 23.-27. September 2019
    Details
    Publication Date: 2020-06-10
    Description: The present study was conducted within the collaborative research center CRC 1211 (EARTH - Evolution at the dry limit) which aims to characterize the mutual relationship of Earth processes and biolog- ical evolution. In this context, claypans in endorheic basins along the Coastal Cordillera of the Atacama desert (Chile) host unique records of the precipitation history of one of the major hyperarid deserts in the world [4,5]. −23 ̊ PAG c) PARANAL Profile NS N Profile B PBT12 PBT12 P4T05 This study aims to provide detailed information about the sedimen- tary architecture and bedrock topography of selected claypans (PAG and PAR, see also Fig. 1, 2). Accordingly, we performed a geophysi- cal survey using the Transient Electromagnetic Method (TEM)[1,2] and Seismics. To derive suitable drilling locations for paleoclimatic research, and to better understand the deposition regime.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
    Format: application/pdf
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  • 8
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    SeismicP Wave Velocity Model From 3‐D Surface and Borehole Seismic Data at the Alpine Fault DFDP‐2 Drill Site (Whataroa, New Zealand) (2020)
    In:  Journal of Geophysical Research: Solid Earth
    Details
    Publication Date: 2020-12-14
    Description: The New Zealand Alpine Fault is a major plate boundary that is expected to be close to rupture, allowing a unique study of fault properties prior to a future earthquake. Here we present 3‐D seismic data from the DFDP‐2 drill site in Whataroa to constrain valley structures that were obscured in previous 2‐D seismic data. The new data consist of a 3‐D extended vertical seismic profiling (VSP) survey using three‐component and fiber optic receivers in the DFDP‐2B borehole and a variety of receivers deployed at the surface. The data set enables us to derive a detailed 3‐D P wave velocity model by first‐arrival traveltime tomography. We identify a 100–460 m thick sediment layer (mean velocity 2,200 ± 400 m/s) above the basement (mean velocity 4,200 ± 500 m/s). Particularly on the western valley side, a region of high velocities rises steeply to the surface and mimics the topography. We interpret this to be the infilled flank of the glacial valley that has been eroded into the basement. In general, the 3‐D structures revealed by the velocity model on the hanging wall of the Alpine Fault correlate well with the surface topography and borehole findings. As a reliable velocity model is not only valuable in itself but also crucial for static corrections and migration algorithms, the Whataroa Valley P wave velocity model we have derived will be of great importance for ongoing seismic imaging. Our results highlight the importance of 3‐D seismic data for investigating glacial valley structures in general and the Alpine Fault and adjacent structures in particular.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 9
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    Zero-offset vertical seismic profiling (VSP) data from the COSC-1 borehole, Sweden (2021)
    GFZ Data Services
    Details
    Publication Date: 2021-06-22
    Description: The International Continental Scientific Drilling Program (ICDP) performed a dual-phase scientific drilling project called Collisional Orogeny in the Scandinavian Caledonides (COSC), to investigate mountain-building processes in the central Scandinavian Caledonides. The borehole COSC-1 was drilled through the Lower Seve Nappe, as the first of two 2.5 km deep drill holes close to Åre, central Sweden. As support for the COSC drilling project, an extensive seismic survey took place in 2014 in and around the newly drilled borehole COSC-1. The active seismic survey, among others, consisted of a high-resolution Zero-Offset Vertical Seismic Profiling (ZOVSP) experiment where seismic receivers were placed inside the borehole. For the seismic source signal a hydraulic hammer source (VIBSIST 3000) was used and activated over a period of 20 s as a sequence of impacts with increasing hit frequency. The wavefield was recorded in the borehole by 15 three-component receivers using a Sercel Slimwave geophone chain with an inter-tool spacing of 10 m. The ZOVSP was designed to result in a geophone spacing of 2 m over the whole borehole length. The source was about 30 meters away from the borehole. For component rotation, a check shot position was located about 1.9 km away from the borehole. This data set contains two data sets: (1) the decoded, pre-processed three-component shot gather, and (2) the final-processed shot gather of only the vertical component.
    Language: English
    Type: info:eu-repo/semantics/workingPaper
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