BackgroundElongated Guadalupe Island lies atop a fossil oceanic ridge crest and rises above the Pacific Ocean surface to an elevation of 1100 m.
Chains of cinder cones are located along fissures oriented both NW-SE and NE-SW and lava flows erupted from them overlie both shield volcanoes. The longest of these fissures cuts across the caldera of the northern volcano and extends beyond it to the SE.
Other pyroclastic cones were constructed along an arcuate fissure near the southern caldera rim. The shield volcanoes and products of the fissure eruptions form a complete alkali basaltic-to-trachytic series reflecting a transition from submarine to subaerial volcanism.
Trachytic lava domes are found within the caldera of the northern shield volcano, and together with very fresh-looking alkali basalt lava flows, form the youngest volcanic rocks on the island.
(Source: Smithsonian / GVP volcano information)
See also: Sentinel hub | Landsat 8 | NASA FIRMS