Surface breakthrough of a basement fault by repeated seismic slip episodes: The Ostler Fault, South Island, New Zealand

Surface breakthrough of a basement fault by repeated seismic slip episodes: The Ostler Fault, South Island, New Zealand

The Ostler Fault is one of the major active reverse faults in the piedmont of the Southern Alps, SE of the Alpine Fault. We present a new geological and morphotectonic map of the southern Ostler Fault, integrated with two seismic reflection profiles across the active central segments of the fault. S...

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Veröffentlicht in:Tectonics (Washington, D.C.) D.C.), 2007-12, Vol.26 (6), p.np-n/a
Hauptverfasser: Ghisetti, Francesca C., Gorman, Andrew R., Sibson, Richard H.
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compressional inversion
New Zealand
seismic reflection
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Gorman, Andrew R.
Sibson, Richard H.
description The Ostler Fault is one of the major active reverse faults in the piedmont of the Southern Alps, SE of the Alpine Fault. We present a new geological and morphotectonic map of the southern Ostler Fault, integrated with two seismic reflection profiles across the active central segments of the fault. Segmented, subparallel scarps define a N‐S belt (∼40 km long and 2−3 km wide) of pure reverse faults, which upthrow and back‐tilt a panel of Plio‐Pleistocene terrestrial units (2.4−1.0 Ma) plus the overlying glacial outwash (
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The fault geometry and kinematics and the subsurface data favor the interpretation that the Ostler Fault propagated updip across the Plio‐Quaternary terrestrial sequence as the emerging, high‐angle splay of an inherited Late Cretaceous−Paleocene normal fault, that underwent repeated cycles of compressional reactivation in the last 2.4 Ma.</abstract><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2007TC002146</doi><tpages>15</tpages></addata></record>
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subjects compressional inversion
New Zealand
seismic reflection
title Surface breakthrough of a basement fault by repeated seismic slip episodes: The Ostler Fault, South Island, New Zealand
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