 Towards the center of the caldera , hot springs including Cajon Los Calabozos and Baños de <unk> are present . The springs are as old as 0 @.@ 3 mya , and may have formed directly after Calabozos 's second eruption as a result of uplift caused by re @-@ occurring activity in the caldera . The vents occur in two clusters , Colorado and Puesto Calabozos , and are located along the margin of a fault at the southwestern edge of the caldera . Hildreth et al . ( 1983 ) evaluated that Calabozos could potentially be useful for the harvesting of geothermal energy . 
