Ash Deposit Bluff

This ash deposit is located just west of the Keanakako’i overlook. The ash is associated with the 1790 eruption  that  killed many of chief Keoua’s warriors as they were on their way to fight a war.  This area is near the Kilauea lava flows of 1971,1974, and 1982.  Most of the area is made up of thin layers of fine volcanic ash. The thick ash sequences indicate a very explosive eruption, probably involving water (hydromagmatic eruptions).  These particular ash deposits most likely result from surge-style eruptions.  These ash layers have been tilted from the movement of the ground.  The ash also contains bombs and accretionary lapilli that are poorly sorted and are deposited in coarse layers. The accretionary lapilli formed because the explosion may have had water involved and it turned into little balls of ash.

Photo by Tim Lincoln

Tilted layers of the ash deposit can be seen in the background.  In the foreground is a more recent pahoehoe lava flow.

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