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Lake sediments record cycles of sediment flux driven by large earthquakes on the Alpine Fault, New Zealand

Jamie D. Howarth, Sean J. Fitzsimons, Richard J. Norris and Geraldine E. Jacobsen
Lake sediments record cycles of sediment flux driven by large earthquakes on the Alpine Fault, New Zealand
Geology (Boulder) (September 2012) 40 (12): 1091-1094

Abstract

Large earthquakes in mountain regions commonly trigger extensive landsliding and are important drivers of erosion, but the contribution of this landsliding to long-term erosion rates and seismic hazard remains poorly understood. Here we show that lake sediments record postseismic landscape response as a sequence of turbidites that can be used to quantify erosion related to large (moment magnitude, M (sub w) > 7.6) earthquakes on the Alpine fault, New Zealand. Alpine fault earthquakes caused a threefold increase in sediment flux over the approximately 50 yr duration of each postseismic landscape response; this represents considerable delayed hazard following earthquake-induced strong ground motion. Earthquakes were responsible for 27% of the sediment flux from the lake catchment over the past 1100 yr, leading us to conclude that Alpine fault earthquakes are one of the most important drivers of erosion in the range front of the Southern Alps.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 12
Title: Lake sediments record cycles of sediment flux driven by large earthquakes on the Alpine Fault, New Zealand
Affiliation: University of Otago, Department of Geography, Dunedin, New Zealand
Pages: 1091-1094
Published: 20120918
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 17
Accession Number: 2012-101271
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012316; accessed on October 15, 2012
Illustration Description: illus. incl. 2 tables, geol. sketch map
Source Medium: WWW
S44°30'00" - S42°00'00", E169°00'00" - E171°00'00"
Secondary Affiliation: Australian Nuclear Science and Technology Organization, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201252
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