Earthquake histories and Holocene acceleration of fault displacement rates

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Title: Earthquake histories and Holocene acceleration of fault displacement rates
Authors: Nicol, Andrew
Walsh, John J.
Mouslopoulou, Vasiliki
Villamor, Pilar
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Date: Oct-2009
Online since: 2011-08-10T11:30:08Z
Abstract: Displacement rates for normal and reverse faults (N = 57) are generally higher when averaged for the Holocene (~10 ka) than for the late Quaternary (~300 ka) and longer time scales. Holocene acceleration of displacement rates could be attributed to geological processes that produce increases of tectonic tempo. We propose an alternative model in which the observed rate changes arise from variability in earthquake slip and/or recurrence coupled with a sampling bias toward those faults that are best represented at the Earth’s surface and accrued displacement fastest during the Holocene. This model is consistent with displacement rates measured over time intervals of up to ~300 k.y. for 129 faults from the Taupo Rift, New Zealand. Departures of earthquake parameters and associated displacement rates from their long-term (>300 k.y.) averages are attributed to fault interactions and occur on time intervals inversely related to these long-term displacement rates and to regional strain rates.
Funding Details: Irish Research Council for Science, Engineering and Technology
Type of material: Journal Article
Publisher: Geological Society of America
Journal: Geology
Volume: 37
Issue: 10
Start page: 911
End page: 914
Copyright (published version): 2009 Geological Society of America
Keywords: FaultsEarthquakes
Subject LCSH: Paleoseismology--Holocene
Faults (Geology)--New Zealand--History
Earthquakes--New Zealand--History
DOI: 10.1130/G25765A.1.
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Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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