Global Volcanism Program | Image GVP-12530
The summit caldera of the Alcedo shield volcano, 7-8.5 km in diameter, is near the center of this March 2019 Planet Labs satellite image monthly mosaic (N is at the top). The caldera contains rhyolite lavas, and both rhyolite tephra and pumice have erupted from three identified vents. Radial basalt lava flows form the flanks like the other five volcanoes that make up Isabela Island. The southern flank of Volcán Darwin is to the north and lava flows from Sierra Negra are to the south.
Satellite image courtesy of Planet Labs, 2019.