Dispersal of ash in the great Toba eruption, 75 ka

Authors

William I. Rose, Michigan Technological UniversityFollow
C. A. Chesner, Michigan Technological University

Document Type

Article

Publication Date

10-1987

Abstract

One of Earth's largest known eruptions, the Toba eruption of 75 ka, erupted a minimum of 2800 km³ of magma, of which at least 800 km³ was deposited as ash fall. This ash may be entirely of coignimbrite origin and dispersed widely because of high drag coefficients on the predominantly bubble-wall shards. Shards of this shape are broken from the walls of spherical vesicles, which formed in high abundance in isotropic strain shadows near phenocrysts in this crystal-rich magma.

Publisher's Statement

© 1987 Geological Society of America. Publisher's version of record: https://doi.org/10.1130/0091-7613(1987)15%3C913:DOAITG%3E2.0.CO;2

Publication Title

Geology

Recommended Citation

Rose, W. I., & Chesner, C. A. (1987). Dispersal of ash in the great Toba eruption, 75 ka. Geology, 15, 913-917. http://doi.org/10.1130/0091-7613(1987)15%3C913:DOAITG%3E2.0.CO;2
Retrieved from: https://digitalcommons.mtu.edu/geo-fp/124