GEO 101 Lecture 9: Geology Chapter 8
2 May 2017
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Geology chapter 8: earthquake- an episode of ground shaking, hazards associated with earthquakes. Sudden slip on a fault (fracture on which sliding occurs) * Sudden change in the arrangement of atoms in the minerals of a rock. Common at divergent plate boundaries (mid-ocean ridges: reverse fault- hanging- wall block moves up relative to the footwall block. Common at convergent plate boundaries (himalayan mountains: transform fault- one block moves to the right (or left) relative to the other block (no footwall or hanging-wall block) Would be felt first at a distance away from focus. Travels through both solids and liquid: s-waves (secondary)- seismic shear waves that pass through the body of the. Would be second wave felt at a distance away from focus. Therefore, people near the earthquake"s focus will feel intense shaking while those at a distance will feel considerably less shaking. Can detect motion not noticed by humans. Can tell us an earthquake is occurring.
