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Monitoring strain on the Wellington fault at Te Marua during 1993

By: Darby, D.J. (Institute of Geological & Nuclear Sciences Limited, Earthquake & Ground Movement Hazards Group. Lower Hutt).
Material type: materialTypeLabelBookSeries: Institute of Geological & Nuclear Sciences science report ; 94/8.Publisher: Lower Hutt : Institute of Geological & Nuclear Sciences, 1994Description: 7 p.ISBN: 0478070977.ISSN: 1171-9184.Subject(s): TE MARUA | STRAINS | WELLINGTON FAULT | MONITORING | EARTH DEFORMATION
Incomplete contents:
Measurements from the Te Marua strainmeter continue to show strain accumulation across the Wellington fault, with results differing slightly from those previously reported. Average dextral shear parallel to the fault trace has accumulated from 1982 to 1993 at a rate of 3.2+/-0.2 ppm/yr, corresponding to a very small rate of displacement, 16+/-1 ppm/yr, across the 5 m aperture strainmeter. The displacement rate remains three orders of magnitude lower than rates referred to as fault creep in the scientific literature. There is an indication that the azimuth of maximum shear strain has decreased between 1982 and 1993, but still remains within 15 deg. of the strike of the Wellington fault. However, the magnitude of the component of shear strain across the fault has remained unchanged. (auth)
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ABSTRACT ABSTRACT NIWA BIBLIOGRAPHY
1 Available 101988-1001

Measurements from the Te Marua strainmeter continue to show strain accumulation across the Wellington fault, with results differing slightly from those previously reported. Average dextral shear parallel to the fault trace has accumulated from 1982 to 1993 at a rate of 3.2+/-0.2 ppm/yr, corresponding to a very small rate of displacement, 16+/-1 ppm/yr, across the 5 m aperture strainmeter. The displacement rate remains three orders of magnitude lower than rates referred to as fault creep in the scientific literature. There is an indication that the azimuth of maximum shear strain has decreased between 1982 and 1993, but still remains within 15 deg. of the strike of the Wellington fault. However, the magnitude of the component of shear strain across the fault has remained unchanged. (auth)

GN

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