2 research outputs found
PALEOSISMOLOGY OF THE LLANO GRANDE FAULT, LOS AZUFRES, MICHOAC\uc1N: NEW SIGNS OF NEOTECTONIC ACTIVITY IN THE CENTRAL SECTOR OF THE TRANS-MEXICAN VOLCANIC BELT (CVTM)
PRELIMINARY GEOMORPHOLOGIC AND PALEOSEISMIC INVESTIGATIONS ALONG THE AGUA FRIA FAULT IN THE LOS AZUFRES VOLCANIC EDIFICE: AN ATTEMPT TOWARDS SEISMIC HAZARD ASSESSMENT IN CENTRAL MEXICO
The Morelia\u2013Acambay Fault System (MAFS) is a < 260 km long fault system bounded
by Acambay Graben to the east and the Cuitzeo Graben to the west. Till date,
most of the paleoseismic investigations were focus on the epicentral area of known
crustal earthquakes, in the Acambay and Cuitzeo grabens. However there are
several undocumented crustal faults between these grabens that are long enough
to generate large magnitude earthquakes. In this study, we used a multidisciplinary
approach (Geomorphology and Paleoseismology) to characterize the earthquake
history of the Agua Fria Fault, one of the largest faults of the MAFS central segment.
The fault traces and associated landforms like triangular facets, ponding and scarps
were mapped using high resolution satellite imageries and topographic data. The
geomorphological data indicate that the fault scarp is at least 13 km long striking
E-W and is height varies from few meters to hundreds of meters. Three trenches
were excavated at three different sites along the Agua Fria fault. Preliminary results
indicate that various earthquakes were produced by this fault during Pleistocene