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A comparison of the sedimentary records of the 1960 and 2010 great Chilean earthquakes in 17 lakes: Implications for quantitative lacustrine palaeoseismology
Indexado
WoS WOS:000358179000008
DOI 10.1111/SED.12193
Año 2015
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



Seismically-induced event deposits embedded in the sedimentary infill of lacustrine basins are highly useful for palaeoseismic reconstructions. Recent, well-documented, great megathrust earthquakes provide an ideal opportunity to calibrate seismically-induced event deposits for lakes with different characteristics and located in different settings. This study used 107 short sediment cores to investigate the sedimentary impact of the 1960 M-w 95 Valdivia and the 2010 M-w 88 Maule earthquakes in 17 lakes in South-CentralChile (i.e. lakes Negra, Lo Encanado, Aculeo, Vichuquen, Laja, Villarrica, Calafquen, Pullinque, Pellaifa, Panguipulli, Neltume, Rinihue, Ranco, Maihue, Puyehue, Rupanco and Llanquihue). A combination of image analysis, magnetic susceptibility and grain-size analysis allows identification of five types of seismically-induced event deposits: (i) mass-transport deposits; (ii) in situ deformations; (iii) lacustrine turbidites with a composition similar to the hemipelagic background sediments (lacustrine turbidites type 1); (iv) lacustrine turbidites with a composition different from the background sediments (lacustrine turbidites type 2) and (v) megaturbidites. These seismically-induced event deposits were compared to local seismic intensities of the causative earthquakes, eyewitness reports, post-earthquake observations, and vegetation and geomorphology of the catchment and the lake. Megaturbidites occur where lake seiches took place. Lacustrine turbidites type 2 can be the result of: (i) local near-shore mass wasting; (ii) delta collapse; (iii) onshore landslides; (iv) debris flows or mudflows; or (v) fluvial reworking of landslide debris. On the contrary, lacustrine turbidites type 1 are the result of shallow mass wasting on sublacustrine slopes covered by hemipelagic sediments. Due to their more constrained origin, lacustrine turbidites type 1 are the most reliable type of seismically-induced event deposits in quantitative palaeoseismology, because they are almost exclusively triggered by earthquake shaking. Moreover, they most sensitively record varying seismic shaking intensities. The number of lacustrine turbidites type 1 linearly increases with increasing seismic intensity, starting with no lacustrine turbidites type 1 at intensities between V1/2 and VI and reaching 100% when intensities are higher than VII1/2. Combining different types of seismically-induced event deposits allows the reconstruction of the complete impact of an earthquake.

Revista



Revista ISSN
Sedimentology 0037-0746

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Disciplinas de Investigación



WOS
Geology
Scopus
Geology
Stratigraphy
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Van Daele, M. Hombre Univ Ghent - Bélgica
2 Moernaut, J. Hombre Universidad Austral de Chile - Chile
ETH - Suiza
3 Doom, Lindsey Mujer Univ Ghent - Bélgica
4 Boes, Evelien Mujer Univ Ghent - Bélgica
5 Fontijn, K. Mujer Univ Ghent - Bélgica
UNIV OXFORD - Reino Unido
6 Heirman, K. Mujer Geol Survey Denmark & Greenland GEUS - Dinamarca
7 Vandoorne, W. Hombre Univ Ghent - Bélgica
8 Hebbeln, D. Hombre Univ Bremen - Alemania
9 PINO-ESPINOZA, MARIELA CONSTANZA Hombre Universidad Austral de Chile - Chile
10 URRUTIA-PEREZ, ROBERTO ENRIQUE Hombre Universidad de Concepción - Chile
11 BRUMMER-PREISLER, ROBERT CLAUS Hombre Universidad Austral de Chile - Chile
12 Fiers, Géraldine Mujer Univ Ghent - Bélgica

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Origen de Citas Identificadas



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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 12.26 %
Citas No-identificadas: 87.74 %

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Citas identificadas: Las citas provienen de documentos incluidos en la base de datos de DATACIENCIA

Citas Identificadas: 12.26 %
Citas No-identificadas: 87.74 %

Financiamiento



Fuente
Swiss National Science Foundation
Natural Environment Research Council
FWO-Vlaanderen
Research Foundation Flanders (FWO-Vlaanderen)
Special Research Fund of Ghent University (BOF)

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Agradecimientos



Agradecimiento
This research was funded mainly by the Research Foundation Flanders (FWO-Vlaanderen) and by the Special Research Fund of Ghent University (BOF). We thank the GSA Limnogeology Division for the Kerry Kelts award and IAS for the postgraduate student grant, both used in the last field season. M. Vincx is acknowledged for the use of the Malvern Mastersizer 2000. We thank Ph. De Smedt for sharing the Bartington MSE2 point sensor. We thank S. Roberts and D. Verschuren for putting their gravity corer at our disposition. This research used data acquired at the XRF Core Scanner Lab at the MARUM Center for Marine Environmental Sciences, University of Bremen, Germany. We are grateful to A. Pena and K. De Rycker for the invaluable assistance on the field. We thank I. Meyer for proofreading an earlier version of this manuscript. We are very grateful to C. Goldfinger and J. Howarth for constructive reviews of an earlier version of this manuscript. K. Fontijn was supported by Natural Environment Research Council grant NE/I013210/1. J. Moernaut acknowledges the support of FWO-Vlaanderen and the Swiss National Science Foundation (grant 133481). M. Van Daele is currently funded by FWO-Vlaanderen.

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