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Using uplifted Holocene beach berms for paleoseismic analysis on the Santa Maria Island, south-central Chile

  • Major earthquakes ( M > 8) have repeatedly ruptured the Nazca-South America plate interface of south-central Chile involving meter scale land-level changes. Earthquake recurrence intervals, however, extending beyond limited historical records are virtually unknown, but would provide crucial data on the tectonic behavior of forearcs. We analyzed the spatiotemporal pattern of Holocene earthquakes on Santa Maria Island (SMI; 37 degrees S), located 20 km off the Chilean coast and approximately 70 km east of the trench. SMI hosts a minimum of 21 uplifted beach berms, of which a subset were dated to calculate a mean uplift rate of 2.3 +/- 0.2 m/ky and a tilting rate of 0.022 +/- 0.002 degrees/ky. The inferred recurrence interval of strandline-forming earthquakes is similar to 180 years. Combining coseismic uplift and aseismic subsidence during an earthquake cycle, the net gain in strandline elevation in this environment is similar to 0.4 m per event

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Author details:Bodo BookhagenORCiDGND, Helmut Peter EchtlerGND, Daniel MelnickORCiDGND, Manfred StreckerORCiDGND, Joel Q. G. Spencer
URL:http://www.agu.org/journals/gl/
DOI:https://doi.org/10.1029/2006gl026734
ISSN:0094-8276
Publication type:Article
Language:English
Year of first publication:2006
Publication year:2006
Release date:2017/03/24
Source:Geophysical research letters. - ISSN 0094-8276. - 33 (2006), 15, Art L15302
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften
Peer review:Referiert
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