Identifying instrumental and historical earthquake records in the SW Iberian margin 210Pb turbidite chronology

Jordi Garcia-Orellana, Eulàlia Gràcia, Alexis Vizcaino, Pere Masqué, Carolina Olid, Francisca Martínez-Ruiz, Elena Piñero, Joan Albert Sanchez-Cabeza, Juanjo Dañobeitia

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Textural, mineralogical and geochemical analyses of near-surface sediments from six different stations offshore SW Iberian Peninsula revealed the presence of thin detrital intervals corresponding to very fine-grained turbidites. Precise dating of the two most recent sedimentary layers based on 210Pb and 137Cs geochronology provides ages of 1971 ± 3 AD and 1908 ± 8 AD. These ages correspond to high-magnitude historical and instrumental earthquakes that occurred in the region: the 1969 Horseshoe Earthquake (Mw 8.0) and the 1909 Benavente Earthquake (Mw 6.0). Such a good correlation between turbidites and high-magnitude (Mw > 6) historical and instrumental seismic events suggests that the record of mass transport deposits can also be used as a paleoseismic indicator in low-convergence margins. Copyright 2006 by the American Geophysical Union.
Original languageEnglish
Article numberL24601
JournalGeophysical Research Letters
Publication statusPublished - 28 Dec 2006

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