Lava flows from the June 26, 2018 eruption of Sierra Negra in Ecuador. IG Ecuador. A little less than two weeks ago, La Cumbre on Fernandina in the Galapagos erupted for the first time last September. That is no shock as the volcano has erupted 3 times since the start of the 21st century. What is surprising is that Sierra Negra on the neighboring island on Isabela erupted yesterday for the first time in 13 years. Two separate eruptions in the Galapagos in June!