Tephra deposits as thick as 11 m (36 ft) at summit of Kīlauea, Hawa...

This sequence of volcanic ash deposits—tephra less than 2 mm (0.08 in) in diameter—is located on the south side of Kīlauea Caldera. The eruptions in about 1650 and in 1790 both generated eruption columns that reached the westerly jet stream winds, which blew tephra onto the south flank of Kīlauea and beyond its shoreline. Explosive eruptions have also hurled blocks as large as 1 to 2 m in diameter onto the rim of Kīlauea's summit caldera.