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Puget Peak Avalanche, Alaska

1971; Geological Society of America; Volume: 82; Issue: 5 Linguagem: Inglês

10.1130/0016-7606(1971)82[1267

1943-2674

M.C. Hoyer,

Climate change and permafrost

Research Article| May 01, 1971 Puget Peak Avalanche, Alaska MARCUS C HOYER MARCUS C HOYER Department of Geology, The Ohio State University, Columbus, Ohio 43210 Search for other works by this author on: GSW Google Scholar Author and Article Information MARCUS C HOYER Department of Geology, The Ohio State University, Columbus, Ohio 43210 Publisher: Geological Society of America Received: 14 Dec 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1971, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1971) 82 (5): 1267–1284. https://doi.org/10.1130/0016-7606(1971)82[1267:PPAA]2.0.CO;2 Article history Received: 14 Dec 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation MARCUS C HOYER; Puget Peak Avalanche, Alaska. GSA Bulletin 1971;; 82 (5): 1267–1284. doi: https://doi.org/10.1130/0016-7606(1971)82[1267:PPAA]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Alaska earthquake of March 27, 1964, caused four phenomena at the head of Puget Bay in south-central Alaska. A large rock-snow avalanche fell from Puget Peak and slid into the bay. Sea waves struck the coast, transporting debris inland to elevations of 7 m. Tectonic warping uplifted Puget Bay 1.7 m, and earth cracks formed in the surficial valley alluvium.The Puget Peak avalanche transported 1.8 × 106m3 of rock, snow, soil, and plant debris downslope. The avalanche began as a large rockfall of jointed and fractured bedrock from Puget Peak. The rockfall reached the cirque traveling at a speed of more than 100 kph; there, it set in motion a large volume of snow. Most of the debris was deposited on the beach and in the bay.Undisturbed 1963-1964 snow in the cirque, areas of undisturbed vegetation and soil, many fresh grooves and scars on bedrock surfaces, and large areas stripped of surficial vegetation and soil along the avalanche track indicate that the avalanche mass slid on snow, soil, and rock from the cirque to the bay. Evidence along the avalanche track indicates that the avalanche mass traveled at high speed along its entire extent.Similar avalanches have occurred at Puget Bay in the past and will occur again, because shattered bedrock and steep slopes remain on Puget Peak. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.