1 / 8

EQ notes 25.2

EQ notes 25.2. Earthquake -A sudden movement or vibration of the ground that occurs when rocks slip or slide along cracks in the Earth - corresponds closely with plate boundaries -usually shallow EQ’s (70km or lower) occur at divergent boundaries

karina-baldwin
Download Presentation

EQ notes 25.2

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. EQ notes 25.2 Earthquake -A sudden movement or vibration of the ground that occurs when rocks slip or slide along cracks in the Earth - corresponds closely with plate boundaries -usually shallow EQ’s (70km or lower) occur at divergent boundaries -deep EQ’s (70km or more) occur at convergent boundaries

  2. FAULTS -crack in the Earth’s crust where rock has moved CAUSES -Energy is released along a fault -caused by forces applied to rocks along plate boundaries

  3. DEFORMATION 4 types of STRESS 1- compression (comes together) -Caused by forces applied to objects -Stress on a object is the force/unit area that acts on that object 2- tension (pulls apart) 3- shearing (moves opposite ways) 4- torsion (twists)

  4. Types of deformation Elastic deformation occurs when stress is applied and the object snaps back to its original shape. Plastic or Inelastic deformation occurs when stress is applied and the object DOES NOT snap back to original position

  5. ENERGY RELEASE Elastic Rebound- EQ occur when a rock that has been stressed releases strain energy and moves along the fault. SEISMIC WAVES • Point of ORIGIN from an EQ is called the FOCUS • Point on SURFACE above focus is the EPICENTER Surface Waves- move both horizontally and vertically EX ocean waves

  6. SEISMIC WAVES CONT. S-waves (secondary)- Transverse waves move materials at right angles to the wave direction. EX- a rope P-waves (primary)- Compressional waves that, move through material by squeezing and stretching the material in the same direction as the wave is moving.EX- a spring http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm

  7. EQ MEASUREMENT Mercalli Scale- measures EQ intensity Richter Scale- magnitude scale, measures the energy released during an EQ Seismograph- records ground vibration during an EQ

  8. EQ DAMAGE • Nearly all EQ damage comes from buildings and human made objects. • Can cause tsumanis • In the middle of nowhere an EQ does not cause much damage at all

More Related