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- W2019223730 abstract "Late Recent eruptions of Mount St. Helens volcano in the Cascade Range of southern Washington have caused numerous lahars; some extend more than 40 miles down valleys west of the volcano. These lahars typically consist of poorly sorted and unstratified detritus derived almost wholly from the volcano. The lahars and inter-bedded fluvial gravel commonly form valley fills; such a fill in the valley of the North Fork of the Toutle River contains at least three lahars. Lahars from Mount St. Helens are composed mainly of nonvesicular rock fragments; thus, their great distance of transport is attributed to mobility provided by water rather than by gas emitted from particles in the matrix. Near the volcano, some of the lahars contain charred wood, proving that they were hot and resulted directly from eruptions. Wood from within a lahar in the fill in the North Fork of the Toutle River valley has a radiocarbon age of about 2000 years. The lahar consists of material derived from a Mount St. Helens volcano that existed before the present cone was built; thus, the present cone must be less than 2000 yearsold. In addition, interpretation of soil profiles younger than the dated wood suggests that the modern cone may have been built within the last thousand Years." @default.
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- W2019223730 date "1962-01-01" @default.
- W2019223730 modified "2023-10-03" @default.
- W2019223730 title "Recent Lahars from Mount St. Helens, Washington" @default.
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- W2019223730 doi "https://doi.org/10.1130/0016-7606(1962)73[855:rlfmsh]2.0.co;2" @default.
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