PD7 Earthquake Basics

create and edit presentations online, for free. Click HERE for the information that you need to complete this worksheet Earthquake Resources Section 1 - What causes Earthquakes? - Use the notes in the link above to fill in the blanks Tectonic plates are always slowly moving, but they get stuck at their edges due to frictionEarthquake caused by a sudden slip on a fault.When the stress on the edge overcomes the friction, the plates shift and smash together.The collisions releases energy in waves that travel through the earth's crust and cause the shaking that we feel. Which was more powerful? The atomic bomb dropped on hiroshima The oklahoma city bombing the 1906 earthquake in San Francisco, CA an average tornado Section 2 - P Waves - Use the link at the top of the page to fill in the blanks Stands for Primary WavesCompression or longitudinal wavesTravel through body of Earth in all directionsFastest waves, arrive firstCan travel through solids, liquids and gases Section 3 - S Waves - Use the link at the top of the page to fill in the blanks Stand fos Secondary WavesTransverse or Shear WavesTravel through body of Earth in all directionsAbout 1.7 times slower than P waves, arrive secondCan travel through solidsCause more damage Section 4 - Surface Waves - Use the link at the top of the page to fill in the blanks Travel along the surface of the EarthSlowest waves, arrive lastCause the most damage Section 5 - Measuring the waves - Seismograph - Use the link at the top of the page to fill in the blanks Waves or vibrations in Earth can be measuredInstrument for measuring waves is called a seismographThe more it shakes, the larger it draws wavesThe gaps in between P and S waves can be used to measure how far away the earthquake happened Seismograph Labeling USe the note link at the top of the page to label this diagram of a seismograph P-waves Arrival times S-waves Surface waves Amplitude