Amy Myers, who is in her final year of PhD, has published her first paper! This paper compiles data from the literature regarding the height, width, aspect ratio (height/width), and composition of viscous extrusions in nature. We compile data for 323 viscous extrusions and find that (1) typically features with aspect ratios < 0.6 are classified by authors as domes, while features with aspect ratios > 0.8 are classified by authors as spines; (2) there lacks very small (W < 20 m) viscous extrusions in nature, which could be either undersampling or reflect minimum conduit size for dome-forming flow; (3) statistical analysis finds no effect of composition for intermediate silica contents; and (4) height and width form a linear trend on a log-log plot. For more information, view the open access paper here.
Fig. 4 from Myers et al. (2024). Log-log plot of height and width of measured viscous extrusions. Characterisation as either a lava dome or lava spineis taken from the source publication. Extrusions classified by previous researchers as lava domes dominate at aspect ratios< 0.6, and those classified as lava spines at aspect ratios > 0.6. Dashed lines represent lines of equal aspect ratio. Photographsshow typical geometries for lava domes (Novarupta, USA; USGS) and lava spines (Santiaguito, Guatemala; Bill Rose)
