GEOG 1266 Lecture Notes - Lecture 5: Mid-Atlantic Ridge, The Vibrations, Mercalli Intensity Scale
25 Apr 2017
School
Department
Course
Professor
Document Summary
1 essay question about krakatoa (where it is and events leading up to it: other land masses, bodies of water near krakatoa (south sumatra and west java, indian. Ocean: plate tectonic theory vs. continental drift theory. Study terms, go through lectures, read textbook pages, powerpoint presentations, Outline: waves, intensity, ground motion, forecast/prediction, tsunami. If large earthquake is far: measuring, plot multiple distances on a map, point of intersection is the epicenter, focus: place where the fault first moved (typically beneath the surface, epicenter: location on surface above focus. Ground motion: solid bedrock: less shaking, unconsolidated sediment: more shaking, liquefaction: the vibrations of the ground causes sand grains to compact and expels water so water comes to the surface. Indicate that the strain is reaching threshold of rock strength: foreshocks: increased frequency of small magnitude earthquakes, difficult to distinguish from normal, background seismic activity, dilatency: Increased ground surface elevations: lower water table.
