Record of a Roman Earthquake (2nd Century AD) in the Guadalentín Depression (Murcia, SE Spain): Micromorphological analysis of liquefaction

espanolEste estudio presenta evidencias sedimentologicas y micromorfologicas de la ocurrencia de un terremoto de epoca Romana (II siglo AD) en las antiguas zonas palustres del sector central de la Depresion del Guadalentin (Murcia). Los analisis sedimentologicos (afloramiento), texturales y micromorfologicos (lamina delgada) muestran claros signos de licuefaccion con el desarrollo de convolutas, inyecciones de arena y estructuras boudinadas en materiales limo-arenosos a meso y micro-escala. El analisis muestra la capacidad de este tipo de estudios para identificar paleosismos de magnitud ≤ 5,0 Mw en el limite de sensitividad (VI-VII) de la Escala Macrosismica ESI07. EnglishThis study present sedimentological and micromorphological evidence on the occurrence of an ancient seismic event of Roman age (2nd Century AD) in the ancient palustrine environments of the Guadalentin Depression (Murcia). Sedimentological (outcrop-scale ), textural and micromorphological (thin-section) analyses evidence clear signals of liquefactions, such as the development of convolute lamination, injection dikes and boudinage levels on sandy -silt materials at both meso and micro-scale. The study shows the capability of this kind of analyses in the iden tification of paleoseismic events with size ≤ 5.0 Mw on the sensitivity threshold (VI-VII) of the ESI07 Intensity Scale.