 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.


 What Does a Volcano Look Like?

   December 04, 2020

    Capture

   Photographer:  Gabrielle Tepp
   Summary Author:  Gabrielle Tepp

   What does a volcano look like? While you might expect a mountain with a
   large crater at the peak, that’s not always the case. This picture (two
   images combined into a panorama for a wider view) shows the summit of
    Bogoslof volcano in the central  Aleutian Islands of Alaska.
   Most of the volcano is hidden beneath the  Bering Sea (visible on
   right) with only the very top forming the small  Bogoslof Island.

   The  2016-2017 eruption of the volcano drastically changed the
   landscape and  morphology of the island, which increased in area
   from less than 74 acres (0.3 sq km) to nearly 321 acres (1.5 sq km).
   Near the center of the image is a  lava dome produced during the
   eruption that is now the highest point of the island.

   The lava dome is mostly covered by  pyroclastic deposits from the 70
   or so explosions that occurred over 8 months. It was still steaming a
   year after the eruption ended when this photo was taken on August 16,
   2018. The ground in front of the lava dome was covered by seawater
   during much of the eruption and may have been an explosion-producing
    vent. The oranges and yellows are  hydrothermally-altered rocks.
    Bogoslof Island is not only an active volcano but an important
    breeding ground for tens of thousands of  fur seals and  sea
   birds.
     * Bogoslof Island, Alaska Coordinates:  53.93034, -168.03525

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    More...

Geology Links

     *  Earthquakes
     *  Geologic Time
     *  Geomagnetism
     *  General Dictionary of Geology
     *  Mineral and Locality Database
     *  Mohs Scale of Mineral Hardness
     *  This Dynamic Earth
     *  USGS
     *  USGS Ask a Geologist
     *  USGS/NPS Geologic Glossary
     *  USGS Volcano Hazards Program

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   Earth Science Picture of the Day is a service of the  Universities
   Space Research Association.

https://epod.usra.edu
 
