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Lay, Vera [Author]; Buske, S. [Author]; Townend, J. [Author]; Kellett, R. [Author]; Savage, M. [Author]; Schmitt, D. R. [Author]; Constantinou, A. [Author]; Eccles, J. D. [Author]; Gorman, A. [Author]; Bertram, M. [Author]; Hall, K. [Author]; Lawton, D. [Author]; Kofman, R. [Author]

3D Active Source Seismic Imaging of the Alpine Fault Zone and the Whataroa Glacial Valley in New Zealand

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  • Media type: E-Article
  • Title: 3D Active Source Seismic Imaging of the Alpine Fault Zone and the Whataroa Glacial Valley in New Zealand
  • Contributor: Lay, Vera [Author]; Buske, S. [Author]; Townend, J. [Author]; Kellett, R. [Author]; Savage, M. [Author]; Schmitt, D. R. [Author]; Constantinou, A. [Author]; Eccles, J. D. [Author]; Gorman, A. [Author]; Bertram, M. [Author]; Hall, K. [Author]; Lawton, D. [Author]; Kofman, R. [Author]
  • imprint: BAM-Publica - Publikationsserver der Bundesanstalt für Materialforschung und -prüfung (BAM), 2021
  • Language: English
  • DOI: https://doi.org/10.1029/2021JB023013
  • Origination:
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  • Description: The Alpine Fault zone in New Zealand marks a major transpressional plate boundary that is late in its typical earthquake cycle. Understanding the subsurface structures is crucial to understand the tectonic processes taking place. A unique seismic survey including 2D lines, a 3D array, and borehole recordings, has been performed in the Whataroa Valley and provides new insights into the Alpine Fault zone down to ∼2 km depth at the location of the Deep Fault Drilling Project (DFDP)-2 drill site. Seismic images are obtained by focusing prestack depth migration approaches. Despite the challenging conditions for seismic imaging within a sediment filled glacial valley and steeply dipping valley flanks, several structures related to the valley itself as well as the tectonic fault system are imaged. A set of several reflectors dipping 40°–56° to the southeast are identified in a ∼600 m wide zone that is interpreted to be the minimum extent of the damage zone. Different approaches image one distinct reflector dipping at ∼40°, which is interpreted to be the main Alpine Fault reflector located only ∼100 m beneath the maximum drilled depth of the DFDP-2B borehole. At shallower depths (z < 0.5 km), additional reflectors are identified as fault segments with generally steeper dips up to 56°. Additionally, a glacially over-deepened trough with nearly horizontally layered sediments and a major fault (z < 0.5 km) are identified 0.5–1 km south of the DFDP-2B borehole. Thus, a complex structural environment is seismically imaged and shows the complexity of the Alpine Fault at Whataroa.
  • Access State: Open Access