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Adams

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Google Earth Placemark
  • Country
  • Subregion Name
  • Volcano Type
  • Last Known Eruption
  • 3742 m
    12274 ft
  • 46.206°
  • -121.490°
  • Elevation
  •  
  • Latitude
  • Longitude

There are no activity reports for Adams.



 Available Weekly Reports


There are no Weekly Reports available for Adams.

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

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
950 (?) Unknown Confirmed 2 Tephrochronology East flank?, Tephra layer 24
200 (?) Unknown Confirmed 2 Tephrochronology Tephra layer 23
300 BCE (?) Unknown Confirmed 2 Tephrochronology Tephra layer 22
400 BCE (?) Unknown Confirmed 2 Tephrochronology Tephra layer 21
550 BCE ± 1000 years Unknown Confirmed 2 Tephrochronology Tephra layers 19-20
1850 BCE (after) Unknown Confirmed 1 Tephrochronology SSE flank (2100 m)
2650 BCE ± 300 years Unknown Confirmed 2 Tephrochronology Tephra layers 17-18
2950 BCE ± 100 years Unknown Confirmed 1 Tephrochronology SSE flank (2600 m), Tephra layer 16
3250 BCE ± 300 years Unknown Confirmed 2 Tephrochronology Tephra layer 15
3550 BCE (?) Unknown Confirmed 2 Tephrochronology Tephra layer 14
3800 BCE ± 1000 years Unknown Confirmed 1 Tephrochronology NNE flank (2100-2250 m)
4050 BCE ± 500 years Unknown Confirmed 2 Tephrochronology Upper SW flank?, Tephra layers 11-13
4550 BCE (?) Unknown Confirmed 2 Tephrochronology NW flank (2200-2400 m), Tephra layer 10
5150 BCE ± 500 years Unknown Confirmed 2 Tephrochronology Tephra layers 5-9
7050 BCE ± 1000 years Unknown Confirmed 2 Tephrochronology Tephra layers 1-4

Although lower in height than its neighbor to the north, Mount Rainier, massive Mount Adams rises above a lower topographic base and is second in volume only to Mount Shasta among volcanoes of the Cascade Range. The Mount Adams volcanic field includes the 200 cu km Mount Adams complex andesitic-dacitic stratovolcano, elongated along a NNW-SSE line, and more than 60 flank vents. Volcanism began about 940 thousand years ago (ka), with three main cone-building stages occurring at about 500, 450 and 30 ka. Adams was active throughout the Holocene, producing two dozen minor explosive eruptions from summit and flank vents. Six Holocene lava flows are located on the flanks between 2100 and 2600 m altitude. The most voluminous Holocene lava flows, some of which traveled 10 km or more, were emplaced between about 7 and 4 ka. The latest eruption about 1000 years ago produced a minor tephra layer and possibly a small lava flow down the east flank.