At the same time , the Rivera Plate subducts beneath the Jalisco block , causing earthquakes such as the 1932 Mexico earthquake . Farther south , the Rivera Plate is bordered by the Cocos Plate which is also subducting beneath Mexico . The relatively oblique subduction of the Cocos Plate may be responsible for the Colima graben , while another theory postulates that the Colima graben is an extension of the East Pacific Rise . The Riviera Plate is a remnant of the Farallon Plate
1932 Mexico earthquake
1932 Jalisco earthquakes
Mascota volcanic field