1 / 29

7.1 Stress in Earth’s crust

7.1 Stress in Earth’s crust. The Way Tectonic Plates Move. Learning Targets. Describe the anatomy of an earthquake and relate plate tectonics (different types of plate boundaries) to earthquakes. Describe how stress builds up earthquakes. Stress. Plate movement is never smooth

duena
Download Presentation

7.1 Stress in Earth’s crust

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 7.1 Stress in Earth’s crust The Way Tectonic Plates Move

  2. Learning Targets • Describe the anatomy of an earthquake and relate plate tectonics (different types of plate boundaries) to earthquakes. • Describe how stress builds up earthquakes

  3. Stress • Plate movement is never smooth • Plates made of solid, rough rock • Stress builds up at plate boundaries • Fold- Rocks bend • Fracture- Rocks break • Earthquake = removal of stress

  4. Stress • Mantle convectioncellsputs a lot of stress on the rocks of the lithosphere.

  5. Types of Stress • Confining: pressure from all directions • No deformation • Compression: pushed together • Fractures or folds • Tension: pulled apart (extension) • Stretch or break • Shear: parallel but opposite (scissors) • Break and slide past one another

  6. Types of Stress • What type of plate boundary • Confining - Results from being buried • Compression - Convergent • Tension -Divergent • Shear - Transform

  7. Elastic vs. Plastic • Rocks under stress will deform • Elastically: bend then return to original shape • Rocks under more stress will deform • Plastically: bend without the ability to return to the original shape

  8. Geologic Structures • Folds • Joints • Faults

  9. Geologic Structures - Folds • Folds: bends in rock due to compression • Monocline: non-horizontal layering • Anticline: Upward bulge • Syncline: Downward bulge

  10. Geologic Structures - Joints • Joints: breaks where rocks do not move

  11. Geologic Structures - Faults • Faults: breaks where rocks have moved

  12. Fault Fracture – If the stress continues, the rock will break

  13. Types of Faults: Dip-slip & Strike-slip

  14. Geologic Structures Summary • Folds: bends in rock due to compression • Monocline: non-horizontal layering • Anticline: Upward bulge • Syncline: Downward bulge • Joints: breaks where rocks do not move • Faults: breaks where rocks have moved

More Related