Available Weekly Reports
- Volcano Info
- Search Database
- Info & Contacts
There are no activity reports for Lassen Volcanic Center.
Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|1914 May 30||1917 Jun 29||Confirmed||3||Historical Observations||Lassen Peak|
|[ 1850 Aug ]||[ 1851 ]||Discredited|
|1666 (?)||Unknown||Confirmed||3||Dendrochronology||Cinder Cone|
|[ 1650 (?) ]||[ Unknown ]||Uncertain||Chaos Crags|
|0980 ± 300 years||Unknown||Confirmed||Radiocarbon (corrected)||Chaos Crags|
|0880 ± 300 years||Unknown||Confirmed||Radiocarbon (corrected)||Chaos Crags|
|0800 ± 300 years||Unknown||Confirmed||Radiocarbon (corrected)||Chaos Crags|
The following references are the sources used for data regarding this volcano. References are linked directly to our volcano data file. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title. Additional discussion of data sources can be found under Volcano Data Criteria.
Christiansen R L, Clynne M A, Muffler L J P, 2002. Geologic map of the Lassen Peak, Chaos Crags, and Upper Hat Creek area, California. U S Geol Surv Geol Invest Ser I-2723, 1:24,000 scale geol map and 17 p text.
Clynne M A, 1990. Stratigraphic, lithologic, and major element geochemical constraints on magmatic evolution at Lassen volcanic center, California. J Geophys Res, 95: 19,651-19,669.
Clynne M A, Champion D E, Trimble D A, Hendley J W II, Stauffer P H, 2000. How old is "Cinder Cone"?--solving a mystery in Lassen Volcanic National Park, California. U S Geol Surv Fact Sheet, 023-00, 4 p.
Clynne M A, Christiansen R L, Muffler L J P, Ramsey D, 2000. Field Trip Guide: Lassen Volcanic National Park and vicinity. Volcanism in National Parks: U.S. Geological Survey-National Park Service Workshop, Sept 26-29, 2000, Redding and Lassen Volcanic National Park, 16 p.
Clynne M A, Muffler L J P, 2010. Geologic Map of Lassen Volcanic National Park and vicinity, California. U S Geol Surv Sci Invest Map, SIM-2899, 1:50,000 scale, 3 sheets and 110 p text.
Clynne M A, Robinson J E, Nathenson M, Muffler L J P, 2012. Volcano hazards assessment for the Lassen region, northern California. U S Geol Surv Sci Invest Rpt, 2012-5176-A.
Coombs H A, Howard A D, 1960. United States of America. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 9: 1-68.
Crandell D R, Mullineaux D R, Sigafoos R S, Rubin M, 1974. Chaos Crags eruptions and rockfall-avalanches, Lassen Volcanic National Park, California. U S Geol Surv J Res, 2: 49-59.
Eppler D B, Fink J, Fletcher R, 1987. Rheologic properties and kinematics of emplacement of the Chaos Jumbles rockfall avalanche, Lassen Volcanic National Park. J Geophys Res, 92: 3623-3633.
Green J, Short N M, 1971. Volcanic Landforms and Surface Features: a Photographic Atlas and Glossary. New York: Springer-Verlag, 519 p.
Guffanti M, Clynne M A, Smith J G, Muffler L J P, Bullen T D, 1990. Late Cenozoic volcanism, subduction, and extension in the Lassen region of California, southern Cascade Range. J Geophys Res, 95: 19,453-19,464.
Heiken G, 1978b. Plinian-type eruptions in the Medicine Lake Highland, California, and the nature of the underlying magma. J Volc Geotherm Res, 4: 375-402.
Hildreth W E, 2007. Quaternary magmatism in the Cascades--geologic perpectives. U S Geol Surv Prof Pap, 1744: 1-125.
Ingebritson S E, Galloway D L, Colvard E M, Sorey M L, Mariner R H, 2001. Time-variation of hydrothermal discharge at selected sites in the western United States: implications for monitoring. J Volc Geotherm Res, 111: 1-23.
Sherrod D R, Smith J G, 1990. Quaternary extrusion rates of the Cascade Range, northwestern United States and southern British Columbia. J Geophys Res, 95: 19,465-19,474.
Turrin B D, Christiansen R L, Clynne M A, Champion D E, Gerstel W J, Muffler L J P, Trimble D A, 1998. Age of Lassen Peak, California, and implications for the ages of late Pleistocene glaciations in the southern Cascade Range. Geol Soc Amer Bull, 110: 931-945.
Williams H, 1932. Geology of the Lassen Volcanic National Park, California. Univ Calif Pub Geol Sci, 21: 195-385.
Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.
The Lassen volcanic center consists of the andesitic Brokeoff stratovolcano SW of Lassen Peak, a dacitic lava dome field, and peripheral small andesitic shield volcanoes and large lava flows, primarily on the Central Plateau NE of Lassen Peak. A series of eruptions from Lassen Peak from 1914 to 1917 marks the most recent eruptive activity in the southern Cascade Range. Activity spanning about 825,000 years began with eruptions of the Rockland caldera complex and was followed beginning about 590,000 years ago by construction of Brokeoff stratovolcano. Beginning about 310,000 years ago activity shifted to the north flank of Brokeoff, where episodic, more silicic eruptions produced the Lassen dome field, a group of 30 dacitic lava domes including Bumpass Mountain, Mount Helen, Ski Heil Peak, and Reading Peak. At least 12 eruptive episodes took place during the past 100,000 years, with Lassen Peak being constructed about 27,000 years ago. The Chaos Crags dome complex was constructed about 1100-1000 years ago north of Lassen Peak. The Cinder Cone complex NE of Lassen Peak was erupted in a single episode several hundred years before present and is considered part of the Lassen volcanic center (Clynne et al., 2000). The 1914-1917 eruptions of Lassen Peak began with phreatic eruptions and included emplacement of a small summit lava dome, subplinian explosions, mudflows, and pyroclastic flows.