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Home > Society and Social Sciences > Politics and government > Changes in the Organic Material in Lakes in the Blast Zone of Mount St. Helens, Washington: Usgs Circular 850-L
Changes in the Organic Material in Lakes in the Blast Zone of Mount St. Helens, Washington: Usgs Circular 850-L

Changes in the Organic Material in Lakes in the Blast Zone of Mount St. Helens, Washington: Usgs Circular 850-L


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About the Book

During several periods of volcanic-ash eruption at Mount St. Helens, Wash., (March 30, May 25-26, May 30-June 2, and June 12-13, 1980) strong winds from the north occurred at high altitudes. As a result, the volcanic ash fell some 50 miles to the south in the Bull Run watershed, the principal water-supply source for the metropolitan area of Portland, Oreg. Water samples collected from three stream sites within the watershed were compared with samples collected during the same season in previous years. No detectable changes were noted in chemical characteristics. Precipitation samples collected immediately after the June 12-13 ash fall ranged in specific conductance from 20 to 41 micromhos per centimeter at 25C and in pH from 4.0 to 4.3 pH units. Stream samples collected during the May-June period ranged in specific conductance from 18 to 28 micromhos per centimeter at 25C and in pH from 6.7 to 7.5 pH units. Volcanic-ash samples were collected and analyzed for particle size, chemical composition, and weight. Significant differences in particle size of ash were found in samples from two separate eruptions.


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Product Details
  • ISBN-13: 9781287174059
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Height: 246 mm
  • Sub Title: Usgs Circular 850-L
  • Width: 189 mm
  • ISBN-10: 1287174051
  • Publisher Date: 01 May 2013
  • Binding: Paperback
  • Spine Width: 2 mm
  • Weight: 86 gr


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Changes in the Organic Material in Lakes in the Blast Zone of Mount St. Helens, Washington: Usgs Circular 850-L
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