Holocene turbidites record earthquake supercycles at a slow-rate plate boundary

Ongoing evidence for earthquake clustering calls for records of numerous earthquake cycles to improve seismic hazard assessment, especially where recurrence times overstep historical records. We show that most turbidites emplaced at the Africa-Eurasia plate boundary off west Algeria over the past ∼8...

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Bibliographic Details
Published in:Geology (Boulder) 2015-04, Vol.43 (4), p.331-334
Main Authors: Ratzov, Gueorgui, Cattaneo, Antonio, Babonneau, Nathalie, Déverchère, Jacques, Yelles, Karim, Bracene, Rabah, Courboulex, Françoise
Format: Article
Language:English
Subjects:
Africa
Algeria
Assessments
Boundaries
Cenozoic
continental margin
cores
Correlation
Correlation analysis
currents
density
Earth Sciences
Earthquakes
Faults
Geophysics
Holocene
lithostratigraphy
magnetic properties
magnetic susceptibility
magnetostratigraphy
marine sediments
Mediterranean Sea
North Africa
paleomagnetism
paleoseismicity
Phases
porosity
Quaternary
Quaternary geology
Sciences of the Universe
Sedimentary geology
sediments
Seismic hazard
Seismic phenomena
Seismology
Strain
turbidite
turbidity currents
velocity
West Mediterranean
western Algeria
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Summary:Ongoing evidence for earthquake clustering calls for records of numerous earthquake cycles to improve seismic hazard assessment, especially where recurrence times overstep historical records. We show that most turbidites emplaced at the Africa-Eurasia plate boundary off west Algeria over the past ∼8 k.y. correlate across sites fed by independent sedimentary sources, requiring a regional trigger. Correlation with paleoseismic data inland and ground motion predictions support that M ∼7 earthquakes have triggered the turbidites. The bimodal distribution of paleo-events supports the concepts of earthquake supercycles and rupture synchronization between nearby faults: 13 paleo-earthquakes underpin clusters of 3-6 events with recurrence intervals of ∼300-600 yr, separated by periods of quiescence of ∼1.6 k.y. without major events on other faults over the study area. This implies broad phases of strain loading alternating with phases of strain release. Our results suggest that fault slip rates are time dependent and call for revising conventional seismic hazard models.
ISSN:0091-7613
1943-2682
DOI:10.1130/G36170.1