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Tephra ground loads with 10 and 90% probability of exceedance respectively for trachytic event from Devil’s Cauldron

Ascension, Ascension Island [United Kingdom], 2024

Figure 5 in: Osman, S., Crummy, J., Thomas, M., & Carver, S. (2024). Probabilistic hazard analyses for a small island: methods for quantifying tephra fall hazard and appraising possible impacts on Ascension Island. Bulletin of Volcanology, 86(10), 82.



This hazard map is the result of scientific research and was published in academic literature. It is presented here to serve as an example of the map type or the map-making methodology. It is NOT the official, operational map. For the current operational hazard map, please consult the proper institutional authorities.


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Map Set

Osman, S., Crummy, J., Thomas, M., & Carver, S. (2024). Probabilistic hazard analyses for a small island: methods for quantifying tephra fall hazard and appraising possible impacts on Ascension Island. Bulletin of Volcanology, 86(10), 82.
https://doi.org/10.1007/s00445-024-01771-3

Other Maps In Set:

Map Data

Map ID4438
Hazard Process(es)Tephra fall
Hazard Zone PresentationSingle hazard: A single hazard process is represented on a series of small map panels of similar sizes
Temporal ScaleBackground, or long-term, map
Spatial ScaleIsland
Publication FormatFigure in a journal article
Zonation Method(s)Probabilistic modeling
Zonation Model(s)Tephra2 (Bonadonna et al. 2005; Bonadonna et al. 2010; Connor et al. 2011); TephraProb (Biass et al. 2016)
Scenario(s) ConsideredComposition; Season or weather; Size, VEI, or intensity
Hazard Zone Label(s)Estimated value or Hazard Impact Metric
Probability Definition(s)Numeric probability
PurposeScientific interest: Intended for scientific research and general scientific interest; usually published in academic journals
AudienceScientists (usually in scientific publication)
Language(s)English
Basemap(s)Hillshade
Basemap overlay(s)
DiemsionalityPlanimetric (2D or map) view
Color SchemeRed to Blue
Volcanic Alert Level System
Go to Global Volcanism Program page for Ascension →