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At the summit of Mauna Loa, around Moku`aweoweo caldera, lie several deposits of ancient explosive debris. These deposits rest atop pahoehoe lava flows that spilled out from the top of the volcano around 1,000 to 1,500 years ago.ilauea had violent steam-driven eruptions as recently as 1924, but Mauna Loa has not produced any major explosions in recorded history. Even though an explosive eruption from Mauna Loa has never been witnessed, ample geologic evidence for pre-historic explosive eruptions exists high atop Mauna Loa.
When Mauna Loa last erupted in 1984 (left), lava came within 7 kilometers of Hilo (right). Parts of Hilo are built on lava from eruptions that occurred over the past couple of hundred years. Credit: left: U.S. Geological Survey Hawaiian Volcano Observatory/ESW Image Bank; right: Â©Ken Lund, CC BY-NC-ND 2.0.n response, development has pushed farther up Mauna Loaâs slopes. Mauna Loa lava flows can be seen on the Big Island, including crossing the major highways 11 and 190. The dark lava flow shown at left in this photo formed in 1859 and the dark flow shown at right is from about 1800.