DOI: 10.1016/j.quascirev.2013.11.015
Scopus记录号: 2-s2.0-84890290215
论文题名: Submarine paleoseismology of the northern Hikurangi subduction margin of New Zealand as deduced from Turbidite record since 16ka
作者: Pouderoux H. ; Proust J.-N. ; Lamarche G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 84 起始页码: 116
结束页码: 131
语种: 英语
英文关键词: Active margin
; Earthquake hazard assessment
; Paleoearthquake
; Peak ground acceleration
; Poverty Bay
; Synchronous slope failures
; Turbidite paleoseismology
Scopus关键词: Active margins
; Earthquake hazard
; Paleoearthquake
; Paleoseismology
; Peak ground acceleration
; Poverty bays
; Slope failure
; Faulting
; Slope stability
; Structural analysis
; Earthquakes
; acceleration
; continental slope
; earthquake epicenter
; earthquake magnitude
; earthquake trigger
; hazard assessment
; paleoseismicity
; radiocarbon dating
; sedimentation
; submarine
; turbidity
; Gisborne
; Hikurangi
; New Zealand
; North Island
; Northland
; Poverty Bay
英文摘要: Paleoseismic studies seek to characterise the signature of pre-historical earthquakes by deriving quantitative information from the geological record such as the source, magnitude and recurrence of moderate to large earthquakes. In this study, we provide a ~16,000 yr-long paleo-earthquake record of the 200km-long northern Hikurangi Margin, New Zealand, using cm-thick deep-sea turbidites identified in sediment cores. Cores were collected in strategic locations across the margin within three distinct morphological re-entrants - the Poverty, Ruatoria and Matakaoa re-entrants. The turbidite facies vary from muddy to sandy with evidence for rare hyperpycnites interbedded with hemipelagites and tephra. We use the Oxal probabilistic software to model the age of each turbidite, using the sedimentation rate of hemipelagite deduced from well-dated tephra layers and radiocarbon ages measurements on planktonic foraminifera.Turbidites are correlated from one core to the other using similarity in sedimentary facies, petrophysical properties and ages. Results show that 46 turbidites are synchronous along the entire margin. Amongst them 41 are interpreted as originating from the upper continental slope in response to earthquake-triggered slope failures between 390±170 to 16,450±310yrBP. Using well-established empirical relationships that combine peak ground acceleration, magnitude and location of earthquakes, we calculate that synchronous slope failures were triggered by the rupture of 3 of the 26 known active faults in the region, each capable of generating Mw 7.3 to 8.4 earthquakes - two are crustal reverse faults and one is the subduction interface. The 41 Mw≥7.3 earthquakes occurred at an average recurrence interval of~400yr over the last ~16,000yr. Among them, twenty are interpreted as subduction interface earthquakes that occurred at an average recurrence interval of~800yr, with alternating periods of high activity and low return times (305-610yr) and quiescence periods with high return times (1480-2650yr). Based on turbidite paleoseismology, we propose that subduction interface earthquakes were of lower magnitude during active periods (Mw>7.5) than during quiescence periods (Mw≥8.2). © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60400
Appears in Collections: 过去全球变化的重建
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作者单位: Géosciences-Rennes, CNRS, Université Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France; National Institute of Water and Atmospheric Research (NIWA), Private Bag 14-901, Wellington 6241, New Zealand
Recommended Citation:
Pouderoux H.,Proust J.-N.,Lamarche G.. Submarine paleoseismology of the northern Hikurangi subduction margin of New Zealand as deduced from Turbidite record since 16ka[J]. Quaternary Science Reviews,2014-01-01,84