REPORT:
Postglacial Lahars From Mount Rainier Volcano, Washington

Table of Contents

• Abstract
• Introduction
  • Geographic setting of the volcano and lahars
  • Climate
  • Terminology and distinctive features of lahars
  • Ways in which lahars originate
  • Age and lithology of Mount Rainier volcano
  • Dating of lahars
  • Origin of the clay in some lahars
• Description of lahars
  • Lahars in the White River drainage basin
    • Greenwater lahar
    • Pre-Osceola lahar assemblage
    • Osceola Mudflow
      • Distribution and volume
      • Texture and mineralogy
      • Origin
    • Post-Osceola lahar assemblage
    • Post-Osceola lahar assemblage in the West Fork valley
  • Lahars in the Nisqually River valley
    • Paradise Lahar
    • Older lahar at Paradise Park
    • Lahars at Van Trump Park
    • Lahar assemblage A
    • Lahar assemblage B
    • Lahar assemblage C
    • Origin of lahar assemblages in the Nisqually and White River valleys
    • Lahar assemblage D
    • Lahars in the Nisqually River valley downstream from the park
  • Kautz Creek valley lahar assemblage
    • Kautz Creek Mudflow, October 2-3, 1947
  • Lahars in the valleys of Tahoma Creek and the North and South Puyallup Rivers
    • Round Pass Mudflow
    • 1,000-year-old lahar
    • Electron Mudflow
    • Lahar assemblage in the Tahoma Creek valley
    • Lahar assemblage in the South Puyallup River valley
    • Block-and-ash flow in the South Puyallup River valley
    • Lahars in the North Puyallup River valley
  • Lahars in the Mowich River valley
  • Lahar in the Carbon River valley
  • Lahars in the Muddy Fork of the Cowlitz River and Ohanapecosh River valleys
• The association of lahars with volcanism
• Hazards from future lahars
• References cited
• Index

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