BackgroundThe elongated shield volcano of Santiago Island, also known as San Salvador Island or James Island, is dotted with Holocene pyroclastic cones. Fresh-looking lava flows from these cones blanket the flanks of the volcano. The 920-m-high summit ridge, lined with a chain of NW-trending cinder and spatter cones, is located at the NW end of the island. Prominent flank tuff cones occur at the western and eastern coasts of Santiago. The most recent activity at Santiago has been concentrated at the NW and SE ends of the island. The spectacular pahoehoe lava flows at James and Sullivan Bays, on opposite ends of the island, were erupted during historical time. The James Bay flows were dated by fragments of marmalade pots left by buccaneers in 1684 that were subsequently embedded in the lava flows described by Charles Darwin in 1835.
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8