b Socorro Island, formerly called Santo Tomas Island, is a volcanic island in the Archipelago of Revillagigedo, which lies west of the Mexican coast between coordinates 18 ° 48’0 “N 110 ° 59’0” Coordinates: 18 ° 48 ‘0’ N 110 ° 59’0 “. The size is 16.5 by 11.5 km, with an area 132 km². Administratively it belongs to the Mexican State of Colima as the other islands of the Archipelago.
The island is irregularly rhombic; By the north ends at Middleton Cape and by the south at an angle formed by Rule Cape and the bays of Braithwait and Binner’s Cove, between which there is a small cove, which is the easiest landing point. This place was baptized with the name of bay Vargas Lozano by the expeditionaries of the University of Guadalajara, in honor of the commander of the frigate Papaloapan, on board of which they made the trip in 1954. The island rises abruptly of the sea until 1,130 Meters, in the Evermann Volcano. The most recent eruption was in 1993. Other recent eruptions have been in: 1848, 1896, 1905, and 1951. From its summit can be distinguished to the north, on a non-hazy day, St. Benedict Island (19º 19 ‘north latitude And 110º 49 ‘west longitude), distant from there 32 nautical miles.