AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
About Alaska's Volcanoes | Hazards from Alaska's Volcanoes | Map & Alphabetical List | Interactive Map | Eruption Search | Volcano Search 
You are here: Home > Volcano Information

Tanaga reported activity

TANAGA LINKS

SAMPLES

Webicorders
EVENT SPECIFIC INFORMATION

Event Name : Tanaga 19200 yBP

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

Lava flow: BibCard
Eruption Type:Effusive
Other""

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."

Contact AVO Privacy Accessibility Information Quality FOIA
URL: avo.alaska.edu/volcanoes/activity.php
Page modified: March 30, 2017 14:36
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.