Detailed geomorphology of debris avalanches of El Estribo volcanic complex (Central Mexico)

Abstract

The El Estribo Volcanic Complex, located to the south of Pátzcuaro Lake (Central Mexico), forms an elevation based on a shield volcano crowned by a cinder cone. Two debris avalanches, dated at 28,000 and 14,000 ybp, cover an area of 4 km 2 with a typical hummocky topography. The zone is a state natural protected area with no previous studies of hazard and risk from mass movement processes. Herein, we present a detailed geomorphological map of the debrisavalanche area, scale 1:20,000. The approach applied used two hierarchical levels, geomorphological landscapes and landforms. The fault scarp was mapped using highresolution digital elevation models obtained whit unmanned aerial vehicles (UAV) survey. We describe and characterized four main geomorphological units, 20 subunits, 66 hummocks, and the general drainage network. This map is a valuable tool to identify and quantify risks from mass movement processes.

Definición del campo de esfuerzos-deformación y sismotectónica del sistema de fallas Morelia-Acambay, México

“…En época prehistórica la zona de Pátzcuaro estuvo también sujeta a diferentes eventos sísmicos. Uno de ellos (M=7.3) ocurrió durante el Pleistoceno y produjo el colapso del sector norte del volcán El Estribo provocando una avalancha de escombros (Pola et al, 2014;Osorio-Ocampo et al, 2018;Gómez-Castillo et al, 2020). La tectónica del área y los sismos asociados modelaron el paisaje, levantando las secuencias lacustres durante el Cuaternario.…”