Southern Mexico's Pacific coast from Jalisco to Oaxca is the site of the Middle American Trench where the Cocos Plate is being subducted. It angles south for more than six hundred miles, most of it directly south of Texas. The region experiences almost continual tremors and earthquakes while the subducted plate is the source of numerous active volcanoes there.
The Mexican Disconnection Theory shows that the pressure from this subduction is breaking the Mexican Land mass loose from the rest of North America, but the biggest question is whether it is being done in a catastrophic way with major displacements spaced by thousands or even tens of thousands of years, or in a slow and deliberate way through continuous small earthquakes.
