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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.
The eruptions which produced the Uwekahuna Ash were much larger than those of 1790, but most of the deposits are buried by younger lava flows of Kilauea and Mauna Loa. The Pahala Ash formed from even larger explosive eruptions earlier in Kilauea's history.Two one-to-two-meter thick ashes underlie the Uwekahuna Ash but overlie the thickest prehistoric ash, a reddish sequence of ash up to 85 feet thick where it is exposed in the Hilina Pali.he current eruption along Kilauea's East Rift Zone continues with passive effusion of lava. The lava is transported underground to the coast along the western edge of the flow field, where it enters the ocean after cascading over an ancient sea cliff.