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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.
About 90 percent of the volcano is covered with lava flows less than 1,100 years in age. Mauna Loa, the largest volcano on Earth, has erupted 33 times since 1843. The most recent eruption in 1984 lasted 22 days and produced lava flows which reached to within about 7.2 km (4.5 miles) of Hilo, the largest population center on the Island of Hawaiâi. Lava flows less than 4,000 years old cover about 90 percent of the volcano. HualÄlai, the third most active volcano on the Island of Hawaiâi, has erupted three times in the past 1,000 years and eight times in the past 1,500 years.