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Tanaga reported activity




Event Name : Tanaga 19200 yBP

Start: 19200 (± 7600 Years) Years BP Ar/Ar

Lava flow: BibCard
Eruption Type:Effusive

Description: From Jicha and others (2012): "The East Tanaga cone is less rugged and lower than Tanaga volcano, reaching 1584 m. Its summit is relatively flat and topped by a shallow, 250-m-wide crater. The cone is composed predominantly of blocky, amphibole-bearing basaltic to andesitic lavas (unit tel; Fig. 3 [in original text]) that extend to the shore on the northern side of the island and fill in a flat-bottomed amphitheater to the south. Most East Tanaga lavas are Holocene in age based on their intact surface morphologies. One lava sample collected from the base of a sea cliff on the northern flank gave a 40Ar/39Ar age of 19.2+/-7.6 ka, indicating that the volcano is at least as old as latest Pleistocene. A young buff-colored, amphibole-bearing lapilli fall deposit, found on or near the surface in several locations on northwestern Tanaga Island, thickens toward East Tanaga’s summit suggesting it originated from there."

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Page modified: March 30, 2017 14:36
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