A review on Quaternary tectonic and nontectonic faults in the central sector of the Iberian Chain, NE Spain Fallas cuaternarias tectónicas y gravitacionales en el sector central de la Cordillera Ibérica, NE de España F. Gutiérrez* 1 , F.J. Gracia 2 , M. Gutiérrez 1 , P. Lucha 1 , J. Guerrero 3 , D. Carbonel 1 , J.P. Galve 4 1 Departamento de Ciencias de la Tierra, Universidad de Zaragoza, Spain 2 Departamento de Ciencias de la Tierra, Universidad de Cádiz,, Spain 3 Department of Geology and Geophysics, Utah State University, USA 4 Dipartimento di Scienze della Terra, Università di Modena e Reggio Emilia, Italy *Corresponding author: fgutier@unizar.es Received: 09/06/2011 / Accepted: 31/01/2012 Abstract Several grabens superimposed on the previous contractional structures have been developed in the central sector of the Iberian  The second extensional phase is recorded by Late Pliocene-Quaternary grabens superimposed and/or inset with respect to the previ- ous basins (Río Grío, Munébrega, Daroca and Jiloca depressions). This article reviews the existing knowledge on the main Quater- nary faults (distribution, seismogenic potential) in the study area and discusses its limitations: (1) Two new grabens (Río Grío and Munébrega) have been recently documented on the basis of geomorphological mapping, suggesting that our knowledge on the dis- tribution of Quaternary faults in the Iberian Chain is still limited. (2) Available data on cumulative displacement and long-term slip rate is scarce for a number of faults mainly due to the lack of correlatable markers on both sides of the faults and/or lack of numerical dates. (3) Our capability to estimate earthquake recurrence and elapsed time is largely limited due to the scarcity of paleoseismo- logical data. Only the Munébrega W Fault and the Concud-Teruel Fault have been studied. The paleoearthquake record inferred for the former is probably under-represented and the latter fault has received different interpretations. The paper also includes the main results of a trenching investigation carried out in a graben generated by interstratal dissolution of evaporites, which allowed us to propose some criteria that may help to differentiate between tectonic (seismogenic) and gravitational (nonseismogenic) faults. Keywords: geomorphological mapping, trenching, paleoseismology, gravitational deformation ISSN (print): 1698-6180. ISSN (online): 1886-7995 www.ucm.es/info/estratig/journal.htm Journal of Iberian Geology 38 (1) 2012: 145-160 http://dx.doi.org/10.5209/rev_JIGE.2012.v38.n1.39210