No latest activity reported for Brushy Butte.

Below is a summary of eruption dates and Volcanic Explosivity Indices (VEI).

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.

Clynne M A, 2007. . (pers. comm.)

Miller C D, 1989. Potential hazards from future volcanic eruptions in California. {U S Geol Surv Bull}, 1847: 1-17

Peterson J A, Martin L M, 1980. Geologic map of the Baker-Cypress BLM roadless area and Timbered Crater RARE II Areas, Modoc, Shasta, and Siskiyou Counties, California. {U S Geol Surv Map}, MF-1214-A, 1:62,500 geol map

Sarna-Wojcicki A M, Champion D E, Davis J O, 1983. Holocene volcanism in the conterminous United States and the role of silicic volcanic ash layers in correlation of latest Pleistocene and Holocene deposits. {In}: Wright H E (ed) {Late-Quaternary Environments of the United States}, Minneapolis: Univ Minnesota Press, 2: 52-77

Brushy Butte forms a small shield complex immediately east of Timbered Crater, SSE of the Medicine Lake Highlands. The Brushy Butte complex has produced a broad apron of basaltic lava flows with fresh-looking flow features that extends preferentially down the regional gradient to the south as far as the Falls River valley. Soil development and revegetation suggested a Holocene age similar to that of Hat Creek flow to the south (Peterson and Martin, 1980), and Miller (1989) also mapped Brushy Butte as Holocene. The Hat Creek flow, however, has been dated at 24,000 +/- 6000 years Clynne (2007, pers. comm.), and Brushy Butte and other young vents between Medicine Lake and Lassen volcanoes could be of latest Pleistocene or early Holocene age.