Get our newsletter!
Check out our volcano tours on VolcanoAdventures.com!
Volcanoes & Earthquakes - new app for Android
Guaranteed tours:
13-29 Nov 2018: Volcano Special: Ibu - Dukono - Lokon - Halmahera (Indonesia)
17-30 Nov 2018: Desert, salt and volcanoes - Danakil desert (Ethiopia)
8-21 Dec 2018: Desert, salt and volcanoes - Danakil desert (Ethiopia)
27 Dec 18 - 2 Jan 2019: Kilauea Volcano Special - Big Island, Hawaiʻi
6-13 Apr 2019: Pearl of the Aegean - Santorini - Santorini Island, Greece
22-27 Apr 2019: Aegean's Hidden Gem: Isle of Milos - Milos Island (Greece)
2-17 May 2019: From Krakatau to Bali - Java (Indonesia)
4-11(12) May 2019: Fascination Volcano - Santorini Island (Greece)
4-12 May 2019: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
11-19 May 2019: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
: spaces available / : guaranteed / : few spaces left / : booked out
Random pictures

Jefferson volcano

stratovolcano 3199 m / 10,495 ft
Oregon, USA (mainland exept Alaska), 44.67°N / -121.8°W
Current status: normal or dormant (1 out of 5) | Reports
Jefferson volcano books
Typical eruption style: Explosive
Jefferson volcano eruptions: 950 AD (?), 4500 BC
TimeMag. / DepthDistanceLocation
Thu, 30 Aug
Thu, 30 Aug 23:38 UTCM 2.6 / 3.8 km37 km- 21km ENE of Mill City, Oregon
Mon, 27 Aug
Mon, 27 Aug 11:21 UTCM 0.9 / 7.6 km29 km- Oregon
Mt Jefferson volcano, one of the lesser known Cascade volcanoes, is the second highest mountain in Oregon. Although it is deeply eroded and has probably not erupted for at least about 1000 years, it is still considered active.

Background:

Jefferson was constructed in 2 major episodes interrupted by extensive glacial erosion. The first eruptive period began about 290,000 years ago and built an andesitic-to-dacitic volcano which might have even been higher than the current summit.
The second eruptive phase, including Jefferson volcano's largest known eruptions, took place between ca. 70,000 and 35,000 years ago and their products for most of the upper part of the stratovolcano. Pyroclastic flow deposits are found as far as 15 km to the east and ash fall deposits can still found as far as Arco in southeast Idaho. In the past 12,000 years, several eruptions took place on vents near the Cascade crest south of Jefferson, building cinder cones and lava flows that traveled down glacial valleys, including Forked Butte and North Cinder Peak. The most recent eruption from Jefferson volcano was also from a cinder cone on the flank of South Cinder Peak, with a lava flow reaching Lake Marion to the west.
Jefferson had been named by Lewis and Clark in order to honor the president who had sponsored their expedition.
---
Source: GVP


Latest satellite images

More on VolcanoDiscovery:

Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Text and images on this webpage are copyrighted. Further reproduction and use without authorization is not consented. If you need licensing rights for photographs, for example for publications and commercial use, please contact us.