Subj : ES Picture of the Day 19  2022
To   : All
From : Dan Richter
Date : Tue Jul 19 2022 12:01:36

 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.


 New Eddystone Rock

   July 19, 2022

    DSC01114r(1)

   Photographer:  John and Ruth Mauel

   Summary Author:  John and Ruth Mauel

   There are many volcanic plugs in the world, of which some are quite
    spectacular, and many of them in  clusters or fields. Shown
   above is  New Eddystone rock located in the Behm Channel, east of
   Ketchikan, Alaska. This eye-catching landform within the  Misty
   Fjords National Monument is geologically and historically unusual.

   Named by Captain George Vancouver in 1793 after a  lighthouse near
   Plymouth, England, 'New' Eddystone rock is the neck of a volcano that
   erupted approximately 15,000 years ago. Energy from the eruption passed
   through the ice that carved the steep-sided fjords of the area. The
   magma erupted near a seam between the granites and gneisses of the
   Coastal Range Batholith and the Taku terranes. Surrounding rocks were
   weakened by the  isostatic rebound caused by the receding of the ice
   sheet. Several  similar plugs that erupted around the same time,
   have been eroded and remain below sea level. This difference in form
   could suggest they were scraped flat by the glaciers.   Studies have
   also shown these structures are strongly associated with numerous
   smaller flows and volcanic activity as far east as Mount Edziza in
   British Columbia.
     * Behm Channel, Alaska Coordinates: 55.503611, -130.935833

Related EPODs

    New Eddystone Rock  Varvite Park in Brazil  Volcanic Tunnels
   of Reunion Island  The Castles of the Calchaquíes Valleys
    Culburra Beach Sand Layers Following Wildfires  Timpa Nature
   Reserve of Acireale
    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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