First paleoseismological results in the epicentral area of the sixteenth century Ameca earthquake, Jalisco – México

The Trans-Mexican Volcanic Belt (TMVB) is a calc-alkaline volcanic arc cut by different active crustal fault systems that have originated several destructive historical earthquakes. Located in the central part of Mexico this region offers exceptional climatic, and fertility soil conditions, which reason why more than 50% Mexican population now live here, increasing seismic risk. Determining potential these important western section TMVB, vicinity city Guadalajara, where 5 million inhabitants are concentrated densely populated urban area. We focus here on epicentral area MW 7.2 sixteenth century Ameca earthquake, one first earthquakes described to take place American continent also may be largest earthquake occurred TMVB record. According some sources, would associated with Ameca-Ahuisculco Fault but no neotectonic study has been carried out so far characterize fault. Here, we describe geomorphology escarpment characteristics segments. This step allowed select suitable site for paleoseismological track historic event. results interpretation two trenches consistent, showing evidence net activity tectono-sedimentary record possibly three events. older not well recorded interpreted as possible event could after 27,91 ± 0,4 cal ka BP before 5,67 0,064 BP. second best around whilst last 0,985 0,065 likely geological earthquake. Considering rupture lengths coseismic displacement measured trenches, system seems capable generating magnitude 6.9 7.3 represents major source hazard Guadalajara.