EPS C20 Lecture Notes - Lecture 4: Mesozoic, Plate Tectonics, Ordovician
8 Sep 2016
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The tectonic action is along the plate boundaries. Categories of plate-plate interactions: divergent . New rift zone, new ocean: transform . What happens when you constantly push or pull on a rock: one option: it gets folded or contorted, another option: it breaks or fractures = earthquake. Important: breakage not random along preexisting stress planes = faults. Magnitude 5. 6 eq: sunday 3 september 16, 12:02 utc, northeastern oklahoma, cause: wastewater injection. The surface of the earth is in constant, perpetual motion. 15 major plates the plates are rigid they are moving, hence they collide, separate, scrape along one another. Largest eq occurs where plate speed is fastest. Subsidence, basin formation: normal because hanging wall is sliding down, foot wall is stable. Mountain building: reverse because hanging wall is sliding up foot wall stable. Example: san andreas and hayward faults: movement purely along the strike, right- and left-lateral. Oblique // : both strike-slip and dip-slip.
