Crustal seismic reflection profile across the alpine fault and coastal plain at Whataroa, South Island.
In: New Zealand Journal of Geology & Geophysics, Jg. 53 (2010-12-01), Heft 4, S. 359-368
Online
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Zugriff:
Crustal seismic reflection data recorded across the Alpine Fault and coastal plain at Whataroa in 1998 are used to derive shallow (4 seconds two-way time or s twt) and deep (14 s twt) seismic reflection images and a simple refraction model. A single 25 km long, 636 channel receiver array recorded energy from 50 kg shots fired at 1 km intervals with intervening shots of 2.5 kg at about 300 m intervals along the profile. Record quality varied from good to poor. Across the Alpine Fault, basement lies at about 300-500 m (0.2-0.5 s twt), and a weak basement reflection may be attributed the Alpine Fault. Basement deepens sharply at about 6 km to the northwest of the fault, and a 3 km section of probably Miocene and younger sediments is imaged to the northwest. The southern boundary of the coastal basin probably corresponds to the South Westland Fault. The deeper section images a distinct band of strong reflectivity at a depth of about 9-10 s twt, the base of which is inferred to be Moho. Depth conversion gives a horizontal Moho across the whole profile at a depth of about 27 km. [ABSTRACT FROM AUTHOR]
Titel: |
Crustal seismic reflection profile across the alpine fault and coastal plain at Whataroa, South Island.
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Autor/in / Beteiligte Person: | Davey, FJ |
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Zeitschrift: | New Zealand Journal of Geology & Geophysics, Jg. 53 (2010-12-01), Heft 4, S. 359-368 |
Veröffentlichung: | 2010 |
Medientyp: | academicJournal |
ISSN: | 0028-8306 (print) |
DOI: | 10.1080/00288306.2010.526545 |
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