Physical-mechanical behavior of fresh and completely altered rocks as an important factor of slope instability in the El Rosario Monarch Butterfly Sanctuary, Michoacán, Mexico

Slope instability in the Butterfly Biosphere Reserve (RBMM) Michoacán, Mexico, is a widespread phenomenon that results from complex interaction among different factors such as climate, slope, and spatial distribution of rock units. The climate temperate subhumid, with rains summer an annual average rainfall 700 to 1250 mm. main physiographic units area are volcanic mountains, slopes greater than 30 degrees. scope this study characterize physical-mechanical properties fresh completely altered lower Miocene andesitic lavas Sierra de Angangueo (Cerro El Campanario, province Rosario, Michoacán) by implementing laboratory tests (bulk density, permeability, porosity, uniaxial compressive strength). sample presents total UCS values 0.262 mD, 17.1 %, 63.5 MPa, respectively. Instead, display 393.71 60.9 0.26 MPa. Our suggest slope degradation induced alteration conditioning region. Atypical rainfalls may act triggering mechanism for failure.