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Titolo:
Crustal deformation of the Marlborough fault zone in the South Island of New Zealand: Geodetic constraints over the interval 1982-1994
Autore:
Bourne, SJ; Arnadottir, T; Beavan, J; Darby, DJ; England, PC; Parsons, B; Walcott, RI; Wood, PR;
Indirizzi:
Shellands Explorat & Prod BV, Res & Tech Serv, NL-2280 AB Rijswijk, Netherl Shell Int Explorat & Prod BV Rijswijk Netherlands NL-2280 AB jk, Netherl Iceland Meteorol Off, Dept Geophys, IS-150 Reykjavik, Iceland Iceland Meteorol Off Reykjavik Iceland IS-150 IS-150 Reykjavik, Iceland Inst Geol & Nucl Sci, Gracefield Res Ctr, Lower Hutt, New Zealand Inst Geol & Nucl Sci Lower Hutt New Zealand tr, Lower Hutt, New Zealand Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England Univ Oxford Oxford England OX1 3PR pt Earth Sci, Oxford OX1 3PR, England Univ Victoria, Sch Earth Sci, Wellington, New Zealand Univ Victoria Wellington New Zealand Earth Sci, Wellington, New Zealand
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B12, volume: 103, anno: 1998,
pagine: 30147 - 30165
SICI:
0148-0227(199812)103:B12<30147:CDOTMF>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLATE-BOUNDARY ZONE; GLOBAL POSITIONING SYSTEM; SAN-ANDREAS FAULT; NORTH CANTERBURY; HOPE FAULT; TECTONIC ROTATIONS; VERTICAL AXIS; STRAIN RATES; HALF-SPACE; PACIFIC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
64
Recensione:
Indirizzi per estratti:
Indirizzo: Bourne, SJ ShellABnt Explorat & Prod BV, Res & Tech Serv, Volmerlan 8,POB 60, NL-2280 Shell Int Explorat & Prod BV Volmerlan 8,POB 60 Rijswijk Netherlands NL-2280 AB
Citazione:
S.J. Bourne et al., "Crustal deformation of the Marlborough fault zone in the South Island of New Zealand: Geodetic constraints over the interval 1982-1994", J GEO R-SOL, 103(B12), 1998, pp. 30147-30165

Abstract

Crustal deformation across the Marlborough fault zone in the South Island of New Zealand has been investigated by resurveying with the Global Positioning System (GPS) a triangulation and trilateration network across part of the zone. The principal strain Fates, which mostly have errors between 5% and 10%, vary systematically across the region. The principal axis of horizontal contraction gradually swings from SE-NW southeast of the Hope fault toalmost east-west in the west. The component of velocity parallel to the strike of the faults can account for 95% of the relative motion between the Australian and Pacific plates. This component exhibits little variation westof the Alpine (Wairau) fault, and shows an almost linear variation from the Wairau fault to the east coast. The horizontal strain rate northwest of the Wairau fault is a small east-west uniaxial contraction (similar to 0.1 ppm yr(-1)). If it is assumed that the crustal blocks bounded by the major faults are primarily driven by basal shear tractions, with stresses on the faults being relatively insignificant, then the slip rates expected on the faults may be derived from the observed velocity variations across the faulttone. These predicted slip rates are in good agreement with geologically observed slip rates, The larger slip rates on the Hope fault are related to the observation that the strain held extends southeast of the fault over a distance large compared with the spacing between the faults, The agreement between predicted and geological slip rates lends support to the idea that the observed pattern of deformation reflects that in the lower lithosphere.

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Documento generato il 27/01/20 alle ore 02:00:21