Subj : ES Picture of the Day 26  2023
To   : All
From : Dan Richter
Date : Thu Jan 26 2023 11:01:06

 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


Related EPODs

    Volcanoes of the Northern Oregon Cascade Range  Mushroom Rock
   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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