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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.
Mauna Loa has erupted 33 times since 1843 (with other less well-dated eruptions going back to 1832 and before). These historical flows cover 806 km of the volcano's surface. Typically, these eruptions began in the summit caldera, Moku'aweoweo, with a curtain of fire (which is a 1 to 2 km line of lava fountains).Eruptions may consist solely of summit activity or they progress down-flank via rift zone dike propagation (in the subsurface) to feed flank vents.ypically, these eruptions began in the summit caldera, Moku'aweoweo, with a curtain of fire (which is a 1 to 2 km line of lava fountains). Eruptions may consist solely of summit activity or they progress down-flank via rift zone dike propagation (in the subsurface) to feed flank vents.