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  • Country
  • Subregion Name
  • Primary Volcano Type
  • Last Known Eruption
  • 41.409°N
  • 122.193°W

  • 4317 m
    14160 ft

  • 323010
  • Latitude
  • Longitude

  • Summit

  • Volcano

There are no activity reports for Shasta.

 Available Weekly Reports

There are no Weekly Reports available for Shasta.

Summary of eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1786 Unknown Confirmed 3 Historical Observations
1250 (?) Unknown Confirmed   Radiocarbon (uncorrected)
1200 (?) Unknown Confirmed   Radiocarbon (uncorrected)
0850 (?) Unknown Confirmed   Radiocarbon (uncorrected)
0150 (?) Unknown Confirmed   Radiocarbon (uncorrected)
0050 (?) Unknown Confirmed 0 Tephrochronology
0150 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
0550 BCE ± 500 years Unknown Confirmed   Tephrochronology
0650 BCE ± 1000 years Unknown Confirmed   Radiocarbon (uncorrected)
0850 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
1150 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
2050 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
2550 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
3050 BCE ± 1000 years Unknown Confirmed 0 Tephrochronology
4050 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
6050 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
6650 BCE (?) Unknown Confirmed   Tephrochronology
7250 BCE (?) Unknown Confirmed   Tephrochronology
7350 BCE (?) Unknown Confirmed 0 Tephrochronology Summit, north and west flanks
7420 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) Shastina and Black Butte
7650 BCE ± 100 years Unknown Confirmed 4 Radiocarbon (uncorrected) Summit, S flank (Red Banks), and Shastina
7750 BCE (?) Unknown Confirmed   Radiocarbon (uncorrected)
8050 BCE (?) Unknown Confirmed   Tephrochronology

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, Miller C D, 1976. Volcanic evolution of Mt. Shasta, California (abs). Geol Soc Amer Abs Prog, 8: 360-361.

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, Miller C D, Glicken H X, Christiansen R L, Newhall C G, 1984. Catastrophic debris avalanche from ancestral Mount Shasta volcano, California. Geology, 12: 143-146.

Hildreth W E, 2007. Quaternary magmatism in the Cascades--geologic perpectives. U S Geol Surv Prof Pap, 1744: 1-125.

Miller C D, 1980. Potential hazards from future eruptions in the vicinity of Mount Shasta volcano, northern California. U S Geol Surv Bull, 1503: 1-43.

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.

Ui T, Glicken H, 1986. Internal structural variations in a debris-avalanche deposit from ancestral Mount Shasta, California, USA. Bull Volc, 48: 189-194.

Wood C A, Kienle J (eds), 1990. Volcanoes of North America. Cambridge, England: Cambridge Univ Press, 354 p.

The most voluminous of the Cascade volcanoes, northern California's Mount Shasta is a massive compound stratovolcano composed of at least four main edifices constructed over a period of at least 590,000 years. An ancestral Shasta volcano was destroyed by one of Earth's largest known Quaternary subaerial debris avalanches, which filled the Shasta River valley NW of the volcano. The Hotlum cone, forming the present summit, and the Shastina lava dome complex were constructed during the early Holocene, as was the SW flank Black Butte lava dome. Eruptions from these vents have produced pyroclastic flows and mudflows that affected areas as far as 20 km from the summit. Eruptions from Hotlum cone continued throughout the Holocene.