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Tephra ground loads likely to cause roof collapse (≥ 150 kg m−2) with 50% probability of exceedance for three basaltic eruptions

Ascension, Ascension Island [United Kingdom], 2024

Figure 8 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 ID4441
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)
Scenario(s) ConsideredSeason or weather; Size, VEI, or intensity; Source location or direction
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)Inhabited areas
DiemsionalityPlanimetric (2D or map) view
Color SchemeRed to Blue
Volcanic Alert Level System
Go to Global Volcanism Program page for Ascension →