Testing rock magnetic and AMS methods in tsunami and storm-induced deposits

• Author(s): Font, Eric ; Duarte, Sílvia ; Veiga-Pires, C. ; Simões, Nuno ; Muñoz, Francisco Ruiz ; Abad, Manuel ; Pozo, Manuel ; Nave, Silvia ; Costas, Susana ; Rebelo, Luis
• Date: 2012
• Persistent ID: http://hdl.handle.net/10400.1/3305
• Origin: Sapientia - Universidade do Algarve
• Subject(s): Rock magnetism; Storm deposit; AMS; Tsunami deposit
• Document Type: Other
• Language: English

Description

Storm- and tsunami-deposits are generated by similar depositional mechanisms making their discrimination hard to establish using classic sedimentologic methods. A promising approach is to use rock magnetism techniques to search for new physical benchmarks of tsunami deposits and to integrate them into a multi-disciplinary study. To test our method, we investigate the 1755 Lisbon tsunami deposit from the Boca do Rio estuary and other Tsunami-induced deposits from Algarve (Portugal) and Huelva (Spain), as well as storm-like deposits for comparison. Magnetic methods repose on bulk (magnetic susceptibility, SIRM, Hc) and directional (AMS, paleomagnetism) magnetic properties.