Caracterización paleosísmica preliminar de la falla de Concud (fosa del Jiloca, Teruel)

Abstract

The Concud fault is a 13-km long fault located at the eastern boundary of the Jiloca graben (Teruel, Spain) that has been active during most of Late Pliocene and Quaternary times. Offsets measured in some dated stratigraphic levels (3.6 Ma, Ruscinian lacustrine carbonates, displacement = 250 m; 116-169 ka, Middle Pleistocene fluvial terrace, displacement = 39-68 m) allow to calculate the corresponding mean slip rates since those ages: 0.07 and 0.23-0.58 mm/year, respectively. No paleoseismic study has been yet carried out in this area. Nevertheless, through empirical correlation within fault data bases, the fault length and the calculated slip rate allow us to approach the recurrence period (1.3 to 16.2 ka) and the coseismic displacement (0.8 to 1.1 m). These non-directly inferred parameters are compared with observations at an outcrop close to Teruel where deposits of the lower fluvial terrace are offset 2 m, which could represent the latest displacement event(s) in the fault