Newberry Volcano from Paulina Peak, Oregon
Posted by: 
Volcanoguy
N 43° 41.352 W 121° 15.293
10T E 640642 N 4838833
Newberry Volcano is one of the largest Quaternary volcanoes in the lower 48 states. It’s last activity was about 700 A.D. (about 1300 years ago).
Waymark Code: WMDTQ
Location: Oregon, United States
Date Posted: 05/29/2006
Views: 125
Although not as high as the major Cascade Peaks of Oregon, Newberry Volcano is larger in both area and volume. It covers an area of over 500 square miles, has an eruptive volume of at least 110 cubic miles, and has been active for the last half million year. Newberry Crater, a 17 square mile caldera, occupies the summit region of Newberry Volcano.
The current caldera formed about 80,000 years ago. Since then numerous eruptions have more than half filled the caldera. About 7,700 years ago the eruption of Mt. Mazama (Crater Lake) deposited at least a foot of pumice over the entire volcano. Since then there have been four eruptive episodes:
1. 7300 years ago - Interlake Eruptive Episode
----Central Pumice Cone
----Interlake Obsidian Flow
----East Lake Tephra
2. 7000 years ago - Northwest Rift Eruptive Episode
----Lava Butte cinder cone and lava flow
----Gas Line spatter cones and lava flows
----Mokst Butte cinder cone and lava flow
----South Kelsey cinder cones and lava flow
----North Sugarpine spatter cones and lava flow
----South Sugarpine cinder cone and lava flow
----Forest Road spatter cones and lava flow
----Lava Cast Forest spatter cones and lava flow
----Lava Cascade spatter cones and lava flow
----Hidden spatter cone and lava flow
----North Summit spatter cones and lava flow
----East Lake Fissure spatter rampart
----The Dome cinder cone and lava flow
----Surveyor cinder cone and lava flow
3. 3500 years ago - East Lake Eruptive Episode
----the two East Lake Obsidian Flows
4. 1300 years ago - Big Obsidian Eruptive Episode
----Newberry Pumice - which has been found as far east as western Montana
----Paulina Lake Ashflow
----Big Obsidian Flow
Volcano Type: Composite Volcano or Stratovolcano
Volcano Location: Continental (subduction zone)
Year of most recent activity: 700
Caldera Visible?: yes
Cone Visible?: yes
Crater Visible?: yes
Geyser/Hot Spring Visible?: no
Lava Dome Visible?: yes
Lava Flow (Moving) Visible?: no
Lava Flow (Not Moving) Visible?: yes
Vent or Fumarole Visible?: no
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