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Recorded Activity Window
- When
- 1820–1854
- Where
- Mount Rainier
USGS data indicates the most recent recorded volcanic activity occurred between 1820 and 1854, not specifically in 1820.
The legacy claim of a January 1820 eruption is unsupported by the supplied passages. The USGS report defines the most recent recorded activity as a window from 1820 to 1854. No specific date or visibility from Seattle is documented for this period.
Sources
- Mount Rainier Wikipedia, revision of 2026-09-17
Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.