Mazama Ash at Mount Baker
From: Scott, et.al., 2000, Mount Baker — Living With An Active Volcano: USGS Fact Sheet 059-00
Mazama Ash at Mount Hood
Volcanic ash (tephra) layers on Mount Baker’s south flank. Lower white band is from an eruption of Crater Lake, Oregon (7,700 years ago); upper yellow band is from a hydrovolcanic eruption of Mount Baker (6,600 years ago). Above the yellow band is a black ash from a magmatic eruption of Mount Baker (also about 6,600 years ago). Tephra hazards at Mount Baker are less significant than at neighboring Glacier Peak volcano to the south. — USGS Photo by Kevin Scott
From: Scott, et.al., 1997, Geologic History of Mount Hood Volcano, Oregon — A Field-Trip Guidebook: USGS Open-File Report 97-263, p.7
Near Mount Hood … about 5 centimeters (2 inches) of Mazama ash.
Mazama Ash in Nebraska
From: Wright and Pierson, 1992, Living With Volcanoes, The U.S. Geological Survey’s Volcano Hazards Program: USGS Circular 1973
The caldera now filled by Oregon’s Crater Lake was produced by an eruption that destroyed a volcano the size of Mount St. Helens and sent volcanic ash as far east as Nebraska.
Other pages in this section
*** previous title *** --- *** next title ***
