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Mark A. Helper results 2 · Newest (Page 1/1, per page 25)
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Sedimentology of alluvial fan deposits near Nature’s Valley, South AfricaNARA Subscribed
Journal of African Earth Sciences · 2024 · Vol. 216 · Pergamon
Safiya M. Hassan; Maarten de Wit; Mark A. Helper; Ahmed W. Hussein
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Dynamic pressure evolution within the 18 May 1980 Mount St. Helens pyroclastic density current: evidence from tree damageNARA Subscribed
Bulletin of Volcanology · 2022 · Vol. 84 · Issue 4 · Springer
Nicole K. Guinn; James E. Gardner; Mark A. Helper
The effects of pyroclastic density currents (PDCs) can be devastating, so understanding their internal dynamics and evolution is important for hazard assessment. We use damaged trees located around Mount St. Helens (USA) as proxy for the dynamic pressure ( P dyn ) of the PDC erupted on 18 May 1980. We recorded the location, distribution, and foliage preservation of damaged trees within the medial and distal parts of the devast...
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