Curved saplings at Mt St Helens

Article Abstract:

The contention that the eruption of the Mount St. Helens volcano on May 18, 1980 caused the conifers in the surrounding forests to be bent downslope is mistaken for three reasons. First, alternative explanations such as the weight of heavy snowfalls could account for the trees' condition without invoking the eruption. Secondly, shrinkage-prone compression wood in the trees' stems could cause the sloping if the saplings are functioning as 'bimetallic strips.' Finally, the assumption that the trees' curvature is consistently downslope is not supported by observation.

Research

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Dynamics of seismogenic volcanic extrusion at Mount St Helens in 2004-05

Article Abstract:

A diverse data set is presented that supports the hypotheses that the 2004-05 eruption of Mount St Helens resulted from stick-slip motion along the margins of the plug as it was forced incrementally upwards by ascending, solidifying, gas-poor magma. Modelled stick-slip oscillations have properties that help constrain the balance of forces governing the earthquakes and eruption, which implies that the volcano was probably poised in a near-eruptive equilibrium state long before the onset of the 2004-05 eruption.

Research and Development in the Physical, Engineering, and Life Sciences, Washington, Earthquake R&D, Seismological research

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Magma-maintained rift segmentation at continental rupture in the 2005 Afar dyking episode

Article Abstract:

A three-dimensional deformation field for the rifting caused due to a volcanic eruption in the Dabbahu magmatic segment of the Afar rift in 2005 is presented. It is concluded that magma intrusion via dyking, rather than segmented normal faulting, maintains and probably initiated the along-axis segmentation of the Afar rift, a nascent seafloor spreading centre in stretched continental lithosphere.

Magma, Dikes (Geology)

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