Fault displacement rates on a range of timescales

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Title: Fault displacement rates on a range of timescales
Authors: Mouslopoulou, Vasiliki
Walsh, John J.
Nicol, Andrew
Permanent link: http://hdl.handle.net/10197/3029
Date: 25-Feb-2009
Abstract: Displacements on tectonic faults primarily accrue during earthquakes at rates that vary through time. To examine the processes that underlie the temporal changes in fault displacement rates we analyse displacements and displacement rates for time periods from the present to 5, 10, 20, 300, 500, 1 000 and 5 000 kyr for 261 active reverse or normal faults from a worldwide dataset. Displacement rates depart from million-year average rates by up to three orders of magnitude with the size of these departures inversely related to fault length and the duration of the sample period. Short-term (≤ 20 kyr) displacement rates generally span a greater range on small faults than large, a feature which suggests more variable growth on smaller faults. Simple earthquake-slip modeling shows that variations in displacement rates require changes in both recurrence interval and slip per event and do not support the Characteristic-slip earthquake model. As long as fault system strain rates are uniform, displacement rates generally become constant over time periods between 20 - 300 kyr, with the length of time required to reach stability being inversely related to the regional basin-wide strain rates. Stable long-term displacements rates and fluctuations in earthquake recurrence intervals and slip arise, in part, due to fault interactions.
Funding Details: Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2008 Elsevier B.V.
Keywords: Displacement rate;Timescale;Earthquake slip;Earthquake recurrence;New Zealand;Fault system
Subject LCSH: Faults (Geology)--New Zealand
Earthquakes--New Zealand
Fault zones--New Zealand
DOI: 10.1016/j.epsl.2008.11.031
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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