Aniakchak Blocky Cone
Start: 400 yBP [1]
Stop: 1931 [1]
Event Type: Explosive
Description: From Bacon and others (2014): "The well-preserved, 60-m-high cinder cone with ~20-m-deep crater near the southwest caldera wall opposite Birthday Pass is informally known as Blocky Cone (figs. 12Dand 14 [in original text]). Although Blocky Cone is mantled by lithic debris from the nearby 1931 vent, fresh basaltic andesite scoria is exposed on the southeast flank of the cone. This is some of the most mafic postcaldera magma (52.2-52.5 weight percent SiO2), comparable only to products of Breezy Cone. Blocky Cone appears to be younger than the Half Cone Pink and Brown Pumice (fig. 5C [in original text]) and to overlie older lava of Vent Mountain. Blocky Cone tephra has not been reported to be on the surface of the youngest Vent Mountain lava that nearly reaches the cone's eastern base, which suggests that this late-erupted Vent Mountain lava is younger than Blocky Cone."
Neal and others (2001) classify the eruption of Blocky Cone as strombolian.
Neal and others (2001) classify the eruption of Blocky Cone as strombolian.
References Cited
[1] Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska, 2014
Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska: U.S. Geological Survey Professional Paper 1810, 74 p., http://dx.doi.org/10.3133/pp1810, available online at http://pubs.usgs.gov/pp/1810/
[2] Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska, 2001
Neal, Christina, McGimsey, R. G., Miller, T. P., Riehle, J. R., and Waythomas, C. F., 2001, Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska: U.S. Geological Survey Open-File Report 00-0519, 35 p.
full-text PDF 24.2 MB Complete Eruption References
Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska, 2014
Bacon, C.R., Neal, C.A., Miller, T.P., McGimsey, R.G., and Nye, C.J., 2014, Postglacial eruptive history, geochemistry, and recent seismicity of Aniakchak Volcano, Alaska: U.S. Geological Survey Professional Paper 1810, 74 p., http://dx.doi.org/10.3133/pp1810, available online at http://pubs.usgs.gov/pp/1810/
Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska, 2001
Neal, Christina, McGimsey, R. G., Miller, T. P., Riehle, J. R., and Waythomas, C. F., 2001, Preliminary volcano-hazard assessment for Aniakchak Volcano, Alaska: U.S. Geological Survey Open-File Report 00-0519, 35 p.
full-text PDF 24.2 MB 