The Trans-Mexican Volcanic Belt (TMVB) is a calc-alkaline volcanic arc cut by different active cr... more 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 of soil conditions, which is the reason why more than 50% of the Mexican population now live here, increasing the seismic risk. Determining the seismic potential of these fault systems is important in the western section of the TMVB, in the vicinity of the city of Guadalajara, where more than 5 million inhabitants are concentrated in a densely populated urban area. We focus here on the epicentral area of the MW 7.2 sixteenth century Ameca earthquake, one of the first earthquakes described to take place in the American continent and which also may be the largest crustal earthquake to have occurred in the TMVB in the historical record. According to some historical sources, this earthquake would be associated with t...
The Jalisco Block of western Mexico has undergone uplift in the Tertiary, in response to subducti... more The Jalisco Block of western Mexico has undergone uplift in the Tertiary, in response to subduction tectonics. The Atenguillo River, interior to the Jalisco Block, has incised the bedrock units of the Jalisco Block, including Cretaceous ash flow tuff, granite, as well as younger volcanic lava flows. To study incision rates, knickpoint propagation, and the uplift rate of the region samples from nine different points along the Atenguillo channel were collected for 36Cl exposure age dating. Exposure ages along the length of the channel are high near the head of the basin where the river meanders in a broad plain. Ages are younger at the knickpoints and downstream where the river cuts deeply and forms a canyon. Incision rates measured at different points along the channel also correlate with channel slope and age. Low incision rates are measured in the oldest part of the channel near the head (station B; 2.5 mm/year), and just above the knickpoints (station C; 0.6 mm/year and station G; 1.4 mm/year). The incision rates are highest just below the knickpoints (station F; 2.4 mm/year) and farther downstream (stations H and I; 5.6 and 2.9 mm/year, respectively). The high incision rates can be attributed to subduction-related uplift of the Jalisco Block. Other features attributable to uplift are emergent paleoshorelines and uplifted marine sediments along the coast; and relatively lower incision rates were measured north of the Jalisco Block.
The Trans-Mexican Volcanic Belt (TMVB) is a calc-alkaline volcanic arc cut by different active cr... more 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 of soil conditions, which is the reason why more than 50% of the Mexican population now live here, increasing the seismic risk. Determining the seismic potential of these fault systems is important in the western section of the TMVB, in the vicinity of the city of Guadalajara, where more than 5 million inhabitants are concentrated in a densely populated urban area. We focus here on the epicentral area of the MW 7.2 sixteenth century Ameca earthquake, one of the first earthquakes described to take place in the American continent and which also may be the largest crustal earthquake to have occurred in the TMVB in the historical record. According to some historical sources, this earthquake would be associated with t...
The Jalisco Block of western Mexico has undergone uplift in the Tertiary, in response to subducti... more The Jalisco Block of western Mexico has undergone uplift in the Tertiary, in response to subduction tectonics. The Atenguillo River, interior to the Jalisco Block, has incised the bedrock units of the Jalisco Block, including Cretaceous ash flow tuff, granite, as well as younger volcanic lava flows. To study incision rates, knickpoint propagation, and the uplift rate of the region samples from nine different points along the Atenguillo channel were collected for 36Cl exposure age dating. Exposure ages along the length of the channel are high near the head of the basin where the river meanders in a broad plain. Ages are younger at the knickpoints and downstream where the river cuts deeply and forms a canyon. Incision rates measured at different points along the channel also correlate with channel slope and age. Low incision rates are measured in the oldest part of the channel near the head (station B; 2.5 mm/year), and just above the knickpoints (station C; 0.6 mm/year and station G; 1.4 mm/year). The incision rates are highest just below the knickpoints (station F; 2.4 mm/year) and farther downstream (stations H and I; 5.6 and 2.9 mm/year, respectively). The high incision rates can be attributed to subduction-related uplift of the Jalisco Block. Other features attributable to uplift are emergent paleoshorelines and uplifted marine sediments along the coast; and relatively lower incision rates were measured north of the Jalisco Block.
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