If you’re heading to Hawaiʻi Volcanoes National Park anytime soon—and you really should!—you should know the national park is ...

That's what happened two years ago with the world’s largest active volcano in Hawaii. About two months before Mauna Loa spewed lava, geologists detected small earthquakes nearby and other signals.

That’s what happened two years ago with the world’s largest active volcano in Hawaii. About two months before Mauna Loa spewed lava, geologists detected small earthquakes nearby and other signals.

About two months before Mauna Loa spewed rivers of glowing orange molten lava, geologists detected small earthquakes nearby and other signs, and they warned residents on Hawaii's Big Island.