Mauna Loa: Earth’s second largest volcano showing signs of awakening from slumberOver the past few months, Mauna Loa, Hawai‘i Island’s largest volcano, has shown subtle signs of stirring from its 31-year-long slumber (its most recent eruption began on March 25, 1984). The U.S. Geological Survey’s Hawaiian Volcano Observatory (HVO) has recorded numerous small earthquakes beneath Mauna Loa’s summit and western flank, and has detected slight expansion across Moku‘āweoweo, the volcano’s summit caldera—signals that Mauna Loa should not be forgotten! What can we expect as this great volcano reawakens and builds toward its next eruption? Generally, as magma rises and eventually infiltrates and fills Mauna Loa’s summit magma reservoir, pressure builds within the volcano. When sufficient pressure is achieved, the volcano expands to accommodate the additional volume of molten rock within it. FULL REPORT