EES 1030 Lecture Notes - Lecture 4: Seismic Wave, Richter Magnitude Scale, Skipping Rope
16 Feb 2018
School
Department
Course
Professor
Document Summary
Mid-ocean ridges: elevated about ocean floor with rift in the center. Hot spots: the plates around hot spots (magma) are constantly in motion. Oceanic islands: a plate is moving over a hot spot, and when it flares up, it creates a new island. Earthquake: release of energy from rocks that were locked up against each other. Earth"s lithosphere rocks are cold and elastic (when under a lot of stress slowly, they bend, and store up energy). Eventually the amount of energy overcomes the rocks and moves them, and some of that energy is dispersed. Released energy: sudden release of energy in deformed rocks, radiates as seismic waves. Focus: site of initial rupture, place within earth where the earthquake waves originalte. Fault: locus of earthquake movement, the crack between the rocks. Strain: the shape that it takes as a result to the stress. Distribution of earthquakes is not random it is focused around plate margins (but also seen in plate interiors)
