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

Adagdak reported activity

ADAGDAK LINKS

SAMPLES

Webicorders
EVENT SPECIFIC INFORMATION

Event Name : Adagdak Younger Cone

Start: 1020000 (± 150000 Years) Years BP Ar/Ar

Lava flow: BibCard
Lahar, debris-flow, or mudflow: BibCard
Eruption Type:Effusive
Eruption Product: andesite BibCard
ChemYes
Othermafic

Description: From Baten (2002): "Mt. Adagdak (650 m asl) was built from three stages of volcanism (Figure 1.5 [in original text])."

"The second stage of volcanism resulted in the formation of two composite cones. The older cone formed on the southern portion of the remnant shield and the younger cone formed on the eroded northern flank of the older composite cone (Coats, 1956). Both cones are primarily andesitic in composition."

"...the younger cone yields a date of 1.02 +/- 0.15 Ma..."

From Meyers and Frost (1994): "A renewed phase of volcanism produced a younger composite cone on the northern flank of the older, eroded composite cone (Fig. 2 [in original text])."

From Coats (1956): "Younger composite cone-A sequence of mudflows consisting largely of fragments of hornblende andesite, capped by two thin hornblende andesite lava flows, makes up the western flanks of Mount Adagdak. These rocks represent a younger cone built after the sea had partly eroded the older composite cone."

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.