General Geology_Class_05 earthquakesnotes

Geology notes on types of earthquakes

1. Dr. Haridas Mohanta Department of Earth Sciences Sambalpur University, Jyoti Vihar, Burla General Geology

2. Slide 2 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology

3. Slide 3 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Internal Constitution of Earth Crust Mantle Core

4. Slide 4 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Internal Constitution of Earth

5. Slide 5 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Internal Constitution of Earth

6. Slide 6 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Crust What is Crust ?

7. Slide 7 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org What is crust? Outer most layer of the Earth. Or Thinnest layer. Relatively cool. Consists of hard rocks. Average thickness is about 35 Km. Oceanic crust is 5-10 Km thick (SiMa) Continental crust is 20-40 Km thick (SiAl) Crust

8. Slide 8 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Types Crust Oceanic crust Continental crust

9. Slide 9 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org What is continental crust? O utermost layer of the E arth's lithosphere. Or Crust Continental crust is the layer of crust that forms the continents and the areas of shallow seabed close to their shores.

10. Slide 10 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org What is oceanic crust? O utermost layer of the E arth below the sea. Or Crust Oceanic crust is the thinner, denser layer of crust that underlies the Earth's oceans.

11. Slide 11 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Continental crust Oceanic crust Thicker ( 20- 40 Km) Less denser Older Crust Thinner(5-10 Km) More denser Younger

12. Slide 12 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Convergent Plate Boundary Two plate move towards each other. Denser oceanic plate subducts under less dense continental plate. Old crust is destroyed. Source: theplanets.org Oceanic plate Continental plate

13. Slide 13 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Divergent Plate Boundary Two plate move away from each other. New crust is created, when both are oceanic plates. Source: theplanets.org Oceanic plate Oceanic plate

14. Mantle Next class…….