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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 volcano is the largest volcano on Earth. It is over 30,000 feet tall from the seafloor where it was born to the summit, which is 13,684 feet above sea level. This is a caldera.A caldera is a large bowl-shaped crater that is formed by the collapse of a volcanic cone after an eruption.The animation shows the steps in the formation of a caldera. The volcano usually shows signs of erupting by producing earthquakes as the magma rises in the volcano.his forms magma which rises inch by inch until it reaches the surface forming a volcano. In 1971 W. Jason Morgan added to the hot spot theory. When the rising solid rock (mantle plume) reaches the plates it splits and spreads horizontally. This split or flow causes the plates to drift.