Universität zu Köln

May, Simon Matthias ORCID: 0000-0001-6762-7500, Pint, Anna, Rixhon, Gilles, Kelletat, Dieter, Wennrich, Volker ORCID: 0000-0003-3617-1963 and Brueckner, Helmut (2013). Holocene coastal stratigraphy, coastal changes and potential palaeoseismological implications inferred from geo-archives in Central Chile (29-32 degrees S). Z. Geomorphol., 57. S. 201 - 229. STUTTGART: GEBRUDER BORNTRAEGER. ISSN 0372-8854

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Abstract

Coastal geomorphology and the stratigraphy of coastal geoarchives record past coastal and fluctuations of coastal environments. In addition, these archives potentially store traces of past extreme events such as earthquakes and tsunamis, severe storms, and major floodings of the coastal hinterland, e.g. due to El Nino conditions. Studying their characteristics may thus improve the knowledge of past frequency and magnitude patterns of such extreme events. For instance, large scaled spatial information about past earthquakes is needed for the understanding and estimation of seismo-tectonic processes. Misinterpretations in the size of preceding earthquakes may lead to incorrect strain balance estimations along megathrusts. Thus, fundamental research on the occurrence of past earthquakes is needed, which can be reflected in sudden or long-term coastal changes. Using sedimentological, geomorphological and microfaunal evidence, coeval geomorphodynamic and palaeoenvironmental changes at four different locations between 29 degrees 50' and 32 degrees 20'S in Central Chile were identified in estuary systems, coastal swamps and coastal plains. The results may represent possible indirect evidence for palaeoseismicity, affecting the coastal system by vertical tectonic movements. Changes of coastline elevation, morphodynamic activity and/or coastal environments, as well as the formation of a liquefaction layer took place during the last c. 400 years. Moreover, major flooding events related to strong El Nino conditions are assumed to have influenced the coastal stratigraphy by depositing high energy fluvial deposits. Our results suggest that the coastal environment, geomorphology and stratigraphy are considerably influenced by tectonic processes in the study area; a relation of the presented findings to the 1730 Great Valparaiso Earthquake is assumed. In general, the findings may encourage the implementation of comparable detailed studies, which may ultimately contribute to a better understanding of the Holocene coastal evolution and its relation to palaeoseismicity in Central Chile.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code May, Simon Matthias UNSPECIFIED orcid.org/0000-0001-6762-7500 UNSPECIFIED Pint, Anna UNSPECIFIED UNSPECIFIED UNSPECIFIED Rixhon, Gilles UNSPECIFIED UNSPECIFIED UNSPECIFIED Kelletat, Dieter UNSPECIFIED UNSPECIFIED UNSPECIFIED Wennrich, Volker UNSPECIFIED orcid.org/0000-0003-3617-1963 UNSPECIFIED Brueckner, Helmut UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-470461
DOI:	10.1127/0372-8854/2013/S-00154
Journal or Publication Title:	Z. Geomorphol.
Volume:	57
Page Range:	S. 201 - 229
Date:	2013
Publisher:	GEBRUDER BORNTRAEGER
Place of Publication:	STUTTGART
ISSN:	0372-8854
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INDIAN-OCEAN TSUNAMI; NORTH-CENTRAL CHILE; BEACH RIDGES; NAZCA PLATE; SEISMIC GAP; GREAT EARTHQUAKES; MAULE EARTHQUAKE; SOUTH-AMERICA; SANTA-MARIA; NW GREECE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47046