Aerial View of Puu Waawaa Cone
Puu Waawaa is on the north rift of Hualalai volcano. Puu Waawaa cone is
the single largest volume (5.5 km3) eruption on the Island of Hawaii. A
trachyte lava flow is also associated with the cone (left margin of
photo). Trachyte refers to fine-grained, generally light-colored rocks
composed mostly of potassium feldspar and minor amounts of dark
minerals. The lava flow is as thick as 900 feet (275 m) and highway 190
climbs its edge. The cone and flow are about 105,000 years old.
Photograph courtesy of the U.S. Geological Survey.
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