Hawaiʻi is an island state built completely of volcanoes old and new. Hot and fluid magma circulating in the planet’s mantle seeps up to and through the crust as a plume and emerges on the seafloor in the middle of the Pacific Plate, where it methodically builds up a shield volcano. The plate is moving north/northwest and subducting under Japan/Russia at a rate of about 5-10 centimeters a year. So, like a great, slow, patient conveyor belt, the plate drifts over the “hot spot” of the mantle plume and volcanoes are built, one after the other.
Eventually the drift of the plate pulls the volcano off of the hot spot that formed it, and eruptions gradually cease. At that point, erosion and settling pick up speed and, just as steadily and constantly, the volcano is worn down to sea level, and then under sea level, too. Formerly high-standing volcanoes that are now under the waves are called “seamounts”, and they stretch nearly to Japan on the northeast end of the Hawaiian chain. The line of old seamounts and young volcanoes is nearly 4,000 miles long, and at the south/southeast end you find the youngest on Hawaiʻi Island, home to Kīlauea and Mauna Loa volcanoes. Jump just one island back to Maui, and there stands Haleakalā. These three volcanoes have been very active in the recent past and all three are within national park boundaries.
When the first people arrived to the present day Main Hawaiian Islands, those islands which are the youngest and tallest above the waves, they employed their immense powers of observation to note that the chain had an older/younger, smaller/larger flow to it. Stories rose from this understanding, powerful myths and legends about Pele, the volcano deity, who travelled the islets and islands from northeast to southwest, finally settling into the great summit caldera of Kīlauea.
