Volcano Watch: Explosive eruptions at the summit of Mauna Loa — when did they occur?


This light gray block of rock (backpack for scale) is part of the approximately 830-year-old explosion deposit on the northwest rim of Moku‘aweoweo, the summit caldera of Mauna Loa.

Three deposits from explosive eruptions at the summit of Mauna Loa are located west, northwest and east of Moku‘aweoweo, the volcano’s summit caldera. In map view, these deposits are fan-shaped. Along the ‘Ainapo Trail, 2.8-3.5 km (1.7 to 2.2 mi) southeast of the caldera, several kipuka expose a fourth distinct explosive deposit.