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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.
Age of Mauna Loa is about 400,000 years ago which means it may have emerged above sea level at that time and it has probably been erupting for at least 700,000 years. The oldest-known dated rocks of Mauna Loa are not older than 200,000 years. Hawaii hotspot, the volcano's magma comes from there, has been responsible for the creation of Hawaii islands. Mauna Loa will become extinct Within 500,000 to one million years from now because the slow drift of Pacific plate will carry it away from the hotspot.