Andean Geology 38 (1): 219-238. January, 2011 Andean Geology formerly Revista Geológica de Chile www.scielo.cl/andgeol.htm Coastal uplift and tsunami effects associated to the 2010 Mw8.8 Maule earthquake in Central Chile Gabriel Vargas1, Marcelo Farías1, Sébastien Carretier2, Andrés Tassara3, Stéphane Baize4, Daniel Melnick5 1 Departamento de Geología, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile.
[email protected];
[email protected] 2 Institut de Recherche pour le Développement, LMTG, Observatoire Midi Pyrenees, 14 av. E. Belin, 31400 Toulouse, France.
[email protected] 3 Departamento de Ciencias de la Tierra, Facultad de Ciencias Quimicas, Universidad de Concepión, Victor Lamas 1290, Barrio Universitario, Concepción, Chile.
[email protected] 4 BERSSIN (Seismic Hazard Division), Institut de Radioprotection et de Surete Nuclaire, IRSN BP 17, 92262 Fontenay-aux-Roses, France.
[email protected] 5 Universität Potsdam, Institut für Erd- und Umweltwissenschaften, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany.
[email protected] Abstract. On February 27, 2010 at 03:34:08 AM an Mw8.8 earthquake, with epicenter located off Cobquecura (73.24°W; 36.29°S), severely hit Central Chile. The tsunami waves that followed this event affected the coastal regions between the cities of Valparaíso and Valdivia, with minor effects as far as Coquimbo. The earthquake occurred along the subduction of the Nazca oceanic plate beneath the South American plate. Coseismic coastal uplift was estimated through observations of bleached lithothamnioids crustose coralline algae, which were exposed after the mainshock between 34.13°S and 38.34°S, suggesting the latitudinal distribution of the earthquake rupture.