May 19, 1916 — Mauna Loa Southwest Rift Zone eruption

Image of the steam plume that accompanied the start of Mauna Loa’s 1916 eruption on the Southwest Rift Zone. View is from within Hawai‘i Volcanoes National Park, with Kīlauea caldera wall visible in the middle of the photo. Photograph by H. Wood and courtesy of University of Hawai‘i at Mānoa Hamilton Library.