The Big Island is built from five overlapping shield volcanoes. Mauna Loa is the world's largest subaerial volcano by volume; measured from its base on the ocean floor it would tower over Everest. Kilauea, on Mauna Loa's southern flank, was nearly continuously erupting from 1983 to 2018 and remains the world's most active volcano. The smooth fanning slopes you see are characteristic of basaltic shield volcanism — runny lava builds gentle gradients rather than steep cones.
10 m colormap + 10 m hillshade NW @ 45° · sources at
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