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The 1980 eruption of Mount St. Helens in southwest Washington State radically changed the physical and socio-economic landscapes of the region. The eruption destroyed the summit of the volcano, sending large amounts of debris into the North Fork Toutle River, and blocking the sole means of drainage from Spirit Lake 4 miles north of Mount St. Helens. As a result of the blockage, rising lake levels could cause failure of the debris blockage, putting the downstream population of approximately 50,000 at risk of catastrophic flooding and mud flows. Further, continued transport of sediment to the river from volcanic debris deposits surrounding the mountain reduces the flood carrying capacity of downstream river channels and leaves the population vulnerable to chronic flooding. The legacy of the 1980 eruption and the prospect of future volcanic, seismic, and flood events mean that risk management in the Spirit Lake Toutle River system will be challenging for decades to come. This report offers a decision framework to support the long-term management of risks related to the Spirit Lake and Toutle River system in light of the different regional economic, cultural, and social priorities, and the respective roles of federal, tribal, state, and local authorities, as well as other entities and groups in the region. It also considers the history and adequacy of characterization, monitoring, and management associated with the Spirit Lake debris blockage and outflow tunnel, other efforts to control transport of water and sediment from the 1980 and later eruptions, and suggests additional information needed to support implementation of the recommended decision framework.
On May 18, 1980, people all over the world watched with awe and horror as Mount St. Helens erupted. Fifty-seven people were killed and hundreds of square miles of what had been lush forests and wild rivers were to all appearances destroyed. Ecologists thought they would have to wait years, or even decades, for life to return to the mountain, but when forest scientist Jerry Franklin helicoptered into the blast area a couple of weeks after the eruption, he found small plants bursting through the ash and animals skittering over the ground. Stunned, he realized he and his colleagues had been thinking of the volcano in completely the wrong way. Rather than being a dead zone, the mountain was very much alive. Mount St. Helens has been surprising ecologists ever since, and in After the Blast Eric Wagner takes readers on a fascinating journey through the blast area and beyond. From fireweed to elk, the plants and animals Franklin saw would not just change how ecologists approached the eruption and its landscape, but also prompt them to think in new ways about how life responds in the face of seemingly total devastation.
"This volume contains guides for 34 geological field trips offered in conjunction with the October 2009 GSA Annual Meeting in Portland, Oregon. Showcasing the region's geological diversity, the peer-reviewed papers included here span topics ranging from accreted terrains and mantle plumes to volcanoes, floods, and vineyard terroir. Locations visited throughout Oregon, Washington, and Idaho encompass Astoria to Zillah. More than just a series of maps, the accompanying descriptions, observations, and conclusions offer new insights to the geologic processes and history of the Pacific Northwest - insights that will inspire readers to put their boots on the evidence as they develop their own understanding of this remarkable and dynamic corner of the world."--Publisher's description.