Science
Science about Mauna Loa.
Geology and History
Geology and History
Geology and History
Volcano Monitoring
Volcano Monitoring
Volcano Monitoring
FAQs
Where is the largest active volcano in the world? Where is the largest active volcano in the world?
Rising gradually to more than 4 km (2.5 mi) above sea level, Hawaii’s Mauna Loa is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi). This makes the volcano's summit about 17 km (10.5 mi) above its base! Learn more: USGS Hawaiian Volcano Observatory