Module 1 Eartquake and Faults Science 8 topic
- 1. Prepared by: rs. Ivy Lynne M. Esguerr
- 2. Unlocking of terms: • Fault – is a break in the Earth’s crust, and along the break which movement has occurred. • Earthquake – vibration of Earth due to rapid release of energy • Plate – rigid section of the lithosphere that moves as a unit • Epicenter – the point on the earth's surface vertically above the focus of an earthquake. • Magnitude – a number that shows the power of an earthquake
- 3. A. Review:
- 7. Directions: • Identify the 4 given pictures that depict one situation. • Guess what the pictures say all about. • Jumbled letters are provided.
- 8. GAME?
- 9. R H T A E
- 10. EARTH
- 11. THEARAQUEK
- 12. EARTHQUAKE
- 13. LFUATS
- 14. FAULTS
- 15. C. Learning Procedure: ACTIVITY 1: SHORT FILM SHOWING
- 17. What is an earthquake? • it is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves.
- 18. What causes earthquakes? • It usually caused when rock (or the solid part of the earth) underground suddenly breaks along a fault.
- 23. There are two types of earthquake -Tectonic earthquake- are caused by the movement of the crustal or tectonic plates -Volcanic earthquake- caused by volcanic activity * Earthquakes occur in areas where the earth’s crust has cracked and produce weak spot called FAULT LINE.
- 24. Faults • are fractures, or zone of weakness on the earth’s crust where ground movement or displacement has occurred or can happen
- 27. Three Types of Fault
- 28. •when the hanging wall moves downward in relation to the foot wall
- 29. •when the hanging wall moves upward in relation to foot wall
- 31. Strike-slip
- 32. Normal
- 33. Normal
- 34. Reverse
- 35. Strike-slip
- 38. How Seismographs Work? A seismograph is an instrument used for recording the intensity and duration of an earthquake.
- 41. Seismograph - machine Seismogram – seismic wave display record
- 42. Types of Seismic Waves
- 43. Primary Waves (P Waves) • A type of seismic wave that compresses and expands the ground • The first wave to arrive at an earthquake
- 44. Secondary Waves (S Waves) • A type of seismic wave that moves the ground up and down or side to side http://daphne.meccahosting.com/~a0000e89/insideearth2.htm
- 46. Surface Waves (L Waves) • Move along the Earth’s surface • Travel more slowly than S and P waves • More destructive
- 49. Typical Seismogram start finish How much time elapsed between the arrival of the P wave (start) and the arrival of the S wave (finish)?
- 58. Active and Inactive Fault -An active fault is likely to cause another earthquake sometime in the future. --faults are considered to be active if they have moved one or more times in at least 10,000 years. * Example is the Philippine West Valley Fault Line System and the Philippine Fault
- 63. Tsunami a large ocean wave usually caused by an underwater earthquake or a volcanic explosion.