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March 12, 2017 Weekly Geology Guest, Volcanoes

March 11, 2017
Greetings from the Bluff Park Back Porch, way up yonder on Shades Mountain (1,109′) in Alabama:

We will now dive into the realm of Volcanoes related to Plate Tectonics.



“Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός “pertaining to building”)[1] is a scientific theory describing the large-scale motion of 7 large plates and the movements of a larger number of smaller plates of the Earth‘s lithosphere, over the last hundreds of millions of years.”

Where ever these plates collide and pulled apart there are earthquakes, volcanoes, and tsunamis.

https://i1.wp.com/www.greatneck.k12.ny.us/gnps/shs/dept/science/tuomey/Earthquakes_PlateTectonics/plate_tectonics.gif
Schematic of Plate Tectonic Volcanoes

These volcanoes are created by the subduction of several plates along the Cascadia subduction zone underneath the North American Plate.

Below is a list of the highest Cascade Volcanoes:

Name Elevation State/Province Location Last eruption
feet   meters Coordinates
Mount Rainier 14,411 4,392 Washington 46°51′10″N 121°45′37″W November to December 1894
Mount Shasta 14,162 4,317 California 41°24′33″N 122°11′42″W 1786
Mount Adams 12,280 3,740 Washington 46°12′09″N 121°29′27″W About 950 AD
Mount Hood 11,239 3,426 Oregon 45°22′25″N 121°41′45″W 1865 to 1866
Mount Baker 10,781 3,286 Washington 48°46′38″N 121°48′48″W September to November 1880
Glacier Peak 10,541 3,213 Washington 48°06′45″N 121°06′50″W 1700 ± 100 years
Mount Jefferson 10,497 3,199 Oregon 44°40′27″N 121°47′58″W About 950 AD
Lassen Peak 10,457 3,187 California 40°29′17″N 121°30′18″W 1914 to 1917
Saint Helens 8,363 2,549 Washington 46°11′28″N 122°11′40″W 2008
Silverthrone Caldera 10,370 3,160 British Columbia 51°26′00″N 126°18′00″W About 100,000 years ago
South Sister 10,358 3,157 Oregon 44°06′12″N 121°46′09″W 50 BC
North Sister (Three Sisters) 10,085 3,074 Oregon 44°09′58″N 121°46′21″W 100,000 yrs ago
Middle Sister (Three Sisters) 10,047 3,062 Oregon 44°08′53″N 121°47′02″W 14,000 yrs ago
Mount McLoughlin 9,495 2,894 Oregon 42°26′40″N 122°18′56″W About 30,000 years ago

Attached pictures show each of the Cascade Volcanoes mentioned above.  Images were selected by the author.

>    Search:  Continental Drift, Plate Tectonics, North American Plate, Volcanoes, Cascade Volcanoes.

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References include:

 

–    Wikipedia
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Editors Note:  It is the intent of this site to keep this discussion as simple as possible, so as to educate the interested general public and not to discuss with the geology crowd the latest geologic theories and nuances.  Thanks, R
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“No copyright infringement intended.
The rights belong to their respective owners”

Copyright Disclaimer: Under Section 107 of the Copyright Act 1976, allowance is made for “fair use” for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.

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Author’s Request:  If you see any pictures that you know the source and photographer, let me know immediately.  Thanks!  R

Images have been searched by TinEye Reverse Image Search.  http://tineye.com/
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Next week, I will dive on into volcanoes that are caused by plate tectonics.
 
Enjoy the adventure!
 
Thanks,
R
1. Mt. Rainier im Reflection Lake. 2006. by Kelvin Kay

1. Mt. Rainier im Reflection Lake. 2006. by Kelvin Kay

2. Sunrise on Mount Shasta, 2010. by Michael Zanger.

2. Sunrise on Mount Shasta, 2010. by Michael Zanger.

3. Mt Adams from south. Wasco County, Oregon. 2009. Werewombat

3. Mt Adams from south. Wasco County, Oregon. 2009. Werewombat

4. Mount Hood reflected in Mirror Lake, Oregon. fhwa.dot.gov

4. Mount Hood reflected in Mirror Lake, Oregon. fhwa.dot.gov

5. Mount_Baker Panorama. by Walter Siegmund

5. Mount_Baker Panorama. by Walter Siegmund

6. Glacier Peak. by Walter Siegmund

6. Glacier Peak. by Walter Siegmund

7. Mount Jefferson. 2004. by Peter Tiegs

7. Mount Jefferson. 2004. by Peter Tiegs

8.-Lassen Peak Manzanita_Lake. 2010. by Avg

8.-Lassen Peak Manzanita_Lake. 2010. by Avg

9A. Mount St. Helens _one day_before the devastating eruption. 1980. Harry Glicken, USGSCVO

9A. Mount St. Helens _one day_before the devastating eruption. 1980. Harry Glicken, USGSCVO

9B. St_ Helens plume from harrys ridge. 05-19-82. by Lyn Topinka

9B. St_ Helens plume from harrys ridge. 05-19-82. by Lyn Topinka

10. Mount_Silverthrone. 2007. by nass5518

10. Mount_Silverthrone. 2007. by nass5518

11. Three_sister. . 1985. USGS, Lyn Topinka

11. Three_sister. . 1985. USGS, Lyn Topinka

12. Mt. tMcLoughlin. 2009. Little Mountain Talk T

12. Mt. tMcLoughlin. 2009. Little Mountain Talk T

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