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7. Volcanoes of the Cascade Range.. Vineyard Mt., Larch Mt., Mary’s Pk.

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Presentation on theme: "7. Volcanoes of the Cascade Range.. Vineyard Mt., Larch Mt., Mary’s Pk."— Presentation transcript:

1 7. Volcanoes of the Cascade Range.

2

3 Vineyard Mt., Larch Mt., Mary’s Pk.

4

5 Corvallis ActiveDormant Extinct

6 7. What Oregon volcano is still considered active (erupted in last 200 years)? 7. Answer: Mt. Hood

7 Mt Hood is an active stratovolcano!

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9 solid Upper Mantle plastic What is in the crust? 47% Oxygen 28% Silicon 8% Aluminum 5% Iron 4% Calcium 3% Magnesium 2% Sodium Crust Continental crust is thicker and less dense than oceanic crust. The Crust is made of solid plates that “float” on the Mantle.

10 8. What are the two most common chemical elements in the earth’s crust? 8. Answer: Oxygen (47%) and Silicon (28%)

11 8a. What are the two most common chemical elements in lava? 8a. Answer: Oxygen (47%) and Silicon (28%)

12 Mt Saint Helens – April 1980

13 Mt. St. Helens Eruption in May 1980

14 Cartoon by Sidney Harris

15 Mt Saint Helens – June 1980

16 Belknap Crater Little Belknap Shield volcanoes in the Cascades This lava flow came from Little Belknap 1300 years ago.

17 Lava Flow at McKenzie Pass A’a’ – blocky lava

18 9. What type of volcano is this? Mt Jefferson is an extinct stratovolcano

19 A 4 inch “bulge” (probably caused by magma) has developed over the last 4 years on the west side of South Sister. (as of 2004) ERUPTION LIKELY?

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21 Earthquake activity by year at Three Sisters showing depth

22 NASA photo October 1994

23 Could South Sister Erupt Soon?

24 Possible Hazards from an Eruption of South Sister - USGS

25 Corvallis Eugene Bend

26 8. Summary – Oregon’s complete geologic map.

27 Complete surface geologic map of Oregon…very complex!!!

28 Cartoon by Sidney Harris

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30 Where was this photo taken?

31 Acknowledgement: USGS, Volcanoes Web Site, Geology of Oregon, and other public web sites for diagrams and photos


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