Eruption dynamics and magma withdrawal during the plinian phase of the Bishop Tuff eruption, Long Valley caldera

Document Type


Date of Original Version



Variations in eruption column height, magma discharge (intensity), and geochemistry have been documented for the plinian phase of the Bishop Tuff eruption from the Long Valley caldera, California. Although exposures of the complete Bishop fall deposit are sparse, their widespread relationships, knowledge of the plinian vent location, and a reasonable estimate of the main dispersal axis allow for the construction of minimum clast isopleths. Column height and intensity are estimated to have increased from 23 km and 7 × 107 kg s-1 to a peak of 45 km and 7.5 × 108 kg s-1 at the end of the plinian phase. Variations in geochemistry of the plinian deposit reveal complex magma withdrawal processes during the Bishop plinian phase. Based on the physical volcanology and compositional variations in the plinian deposit, a model is proposed for the temporal progression of magma withdrawal during the plinian phase. -from Authors

Publication Title, e.g., Journal

Journal of Geophysical Research