United States · Stratovolcano
Mount Tehama
Lassen Volcanic Center
- Type
- Stratovolcano
- Elevation
- 3187m
- Last eruption
- 1917

- Type
- Stratovolcano
- Country
- United States
- Region
- North America / High Cascades Volcanic Arc
- Elevation
- 3187m
- Coordinates
- 40.492, -121.508
- Last eruption
- 1917
- Tectonic setting
- Subduction zone / Continental crust (> 25 km)
- Landform
- Composite
- Major rock type
- Andesite / Basaltic andesite
Geological summary
The Lassen Volcanic Center consists of the andesitic Brokeoff stratovolcano SW of Lassen Peak, a dacitic lava dome field, peripheral small andesitic shield volcanoes, and large lava flows, primarily on the Central Plateau NE of Lassen Peak.
Excerpt from the Global Volcanism Program, Smithsonian Institution · Read the full summary on GVP →
From Wikipedia
Mount Tehama is an eroded extinct andesitic stratovolcano in the Cascade Volcanic Arc and the Cascade Range in Northern California. Part of the Lassen volcanic area, its tallest remnant, Brokeoff Mountain, is itself the second highest peak in Lassen Volcanic National Park and connects to the park's highest point, Lassen Peak. Located on the border of Tehama County and Shasta County, Brokeoff's peak is the highest point in the former. The hikers that summit this mountain each year are treated to "exceptional" views of Lassen Peak, the Central Valley of California, and many of the park's other features. On clear days, Mount Shasta can also be seen in the distance.
Wikipedia · CC BY-SA · Read full article →
Eruption history
6 recordedGlossaryRecord summary
- Confirmed eruptions
- 5
- Uncertain eruptions
- 1
- Span of confirmed record
- 800 (±300 yrs) – 1917
- Largest confirmed eruption
- VEI 3 (1914, the most recent of 2)
- Confirmed eruptions since 1900
- 1
Detailed timeline
- 1914VEI 3Observed1914-05-30 – 1917-06-29Lassen Peak
- 1666VEI 3Geological estimate1666 – end unknownCinder Cone
- 1650VEI ?Method not stated1650 – end unknownChaos Crags
- 980 (±300 yrs)VEI ?Geological estimate980 – end unknownChaos Crags
- 880 (±300 yrs)VEI ?Geological estimate880 – end unknownChaos Crags
- 800 (±300 yrs)VEI ?Geological estimate800 – end unknownChaos Crags
Nearby volcanoes
External links
⚠ For reference only. Not for emergency response.