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Physiographic diagrams of the May 18, 1980, landslide-eruption of Mount St. Helens, Washington Physiographic diagrams of the May 18, 1980, landslide-eruption of Mount St. Helens, Washington
This sequence of diagrams shows the complex series of events that culminated in the catastrophic eruption of Mount St. Helens on the morning of May 18, 1980.
Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California Preliminary map showing recently active breaks along the Maacama Fault zone between Hopland and Laytonville, Mendocino County, California
The southernmost 15 km of this map is a product of a study that began in 1975 as part of a study of recency of faulting in coastal California (Ziony and others, 1974; Buchanan-Banks and others, 1978; Pampeyan , 1979). In February 1975, after being shown evidence of recent faulting in the vicinity of Ukiah by E. C. Winterhalder, Principal Engineering Geologist for Harding - Lawson...