Ash3d simulation outputs of ash deposition from hypothetical eruptions of Aniakchak (Alaska), Chikurachki (Kurile Islands) and Popocatepétl (Mexico)

• Main Authors: Plunkett, Gill, Sigl, Michael, Schwaiger, Hans, Tomlinson, Emma, Toohey, Matthew, McConnell, Joseph R., Pilcher, Jonathan R., Hasegawa, Takeshi, Siebe, Claus
• Format: Other/Unknown Material
• Language: English
• Published: 2021
• Subjects: Ash3d; Tephra deposition; Ash dispersal; Volcanic eruptions; Greenland; Alaska
• Online Access: https://zenodo.org/record/4888030; https://doi.org/10.5281/zenodo.4888030

Ash3d simulation outputs showing ash deposition from hypothetical eruptions of Aniakchak (Alaska), Chikurachki (Kurile Islands) and Popocatepétl (Mexico). We modelled ash deposition from 1,000 randomly selected hypothetical eruption scenarios using the advection-dispersion-sedimentation software Ash3d (Schwaiger et al., 2012) to evaluate the necessary eruption and meteorological parameters needed to transport ash as far as the NEEM coring site (77°27'N 51°3.6'W; 2,000 m above sea level) in Greenland. The same eruption source parameters are applied to each of the three volcanoes of interest: Aniakchak (Alaska), Chikurachki (Kurile Islands) and Popocatepétl (Mexico). We used meteorological data randomly selected from the period 1950 to 2010 drawn from the 2.5 degree NCEP-NCAR Reanalysis II dataset (https://climatedataguide.ucar.edu/climate-data/ncep-reanalysis-r2). Eruption source parameters consisted of randomly selected start times from a uniform distribution between 1950 and 2010. Eruptive volume was selected from a log-normal distribution between 0.01 and 2.0 km3 (dense rock equivalent). Plume heights were calculated using a best-fit relationship between eruptive volume and plume height with a random adjustment (Gaussian with μ = 0 km and σ = 2.9 km) within the range 7–35 km. Mass eruption rate was calculated from a best-fit relationship with plume height and duration using the mass eruption rate and eruptive volume (see Mastin et al. 2020). The same grain-size distribution (GSD) was used (15% 0.250 mm, 20% 0.125 mm, 40% 0.063 mm, and 25% 0.031 mm) for all simulations. References Mastin, L. G., Van Eaton, A. R., and Schwaiger, H. F.: A probabilistic assessment of tephra-fall hazards at Hanford, Washington, from a future eruption of Mount St. Helens, U.S. Geological Survey Open-File Report 2020–1133, 54 pp., https://doi.org/10.3133/ofr20201133, 2020. Schwaiger, H., Denlinger, R., and Mastin, L. G.: Ash3d: a finite-volume, conservative numerical model for ash transport and tephra deposition, J. Geophys. Res., ...