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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.
- In 1950, lava erupted from a fissure on Mauna Loaâs southwest rift zone, at an elevation of almost 10,000 feet, crossing Highway 11 in three places and destroying about two dozen structures before reaching the South Kona shoreline about three hours later. Itâs 500 times greater in volume than Mt. Rainier, the picturesque volcano in Washington state. - Mauna Loa is so huge that it actually causes the Pacific plate it is residing on to sag under the weight of the volcano. - Mauna Loa is one of five Hawaii Island volcanoes.