MSGID: 1:317/3 63d2bfe3   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Volcanoes of the Northern Oregon Cascade Range   
      
      January 26, 2023   
      
       221216-14   
       PacNWtectonics   
      
      Photographer:  Marli Miller   
      Summary Author:  Marli Miller   
      The  Cascade Volcanoes form a linear chain that runs north-south   
      from northern California to southern British Columbia. They form a line   
      because they’re fed by  magma that originates by  subduction of   
      the  Juan de Fuca Plate beneath North America -- and the subduction   
      zone trends north-south (see schematic figures below).   
      
      This photo shows part of the volcanic chain, from  South Sister   
      northward to Mts  Jefferson and  Hood; Mt.  Adams in   
      Washington appears faintly on the horizon. Two  rhyolitic lava   
      flows, erupted between 2000-2300 years ago, appear on the flanks of   
      South Sister. Notice also the many smaller peaks and cones. The Oregon   
      Cascades hosts more than a thousand volcanic vents that have erupted in   
      the last 2 million years. These vents are mostly  basaltic in   
      composition but include  andesitic and rhyolitic ones as well. Photo   
      taken on December 16, 2022.   
      
      Oregon’s Cascade Range Coordinates: ~44.000, -121.900   
      
      
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      State Park  Subterranean Cathedral of Salt in Sicily  Opalized   
      Fossil of a Cycad Cone  Radial Stress Fracture  Red Bar Natural   
      Bridge, Utah   
       More...   
      
   Geology Links   
      
        *  Earthquakes   
        *  Geologic Time   
        *  Geomagnetism   
        *  General Dictionary of Geology   
        *  Mineral and Locality Database   
        *  Mohs Scale of Mineral Hardness   
        *  This Dynamic Earth   
        *  USGS   
        *  MyShake - University of California, Berkeley   
        *  USGS Ask a Geologist   
        *  USGS/NPS Geologic Glossary   
        *  USGS Volcano Hazards Program   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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