EPS C20 Lecture Notes - Lecture 1: Strike And Dip, Mantle Plume, Blow Torch
19 Dec 2017
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Document Summary
When the ground shakes where i am (seismic waves) Earthquakes happen along boundaries of plates - is a rupture of a fault (seismic source) Eq occur along major ocean featureslike ridges and trenches. Eq occur under some major mountainranges, like himalaya, alps and andes. Father of continental drift and plate tectonics. That earth is not fixed and static but moves around horizontally. Ridge in the centers of most oceans. Plates are rigid, moving and hence they collide. Largest eqs occur where plate speed is fastest. Most have reverse faulting - hanging wall is moving up. Two plates moving away from each other. Most have normal faulting - hanging wall is falling down. Where two plates pass by each other without up-down movement. Stationary hot mantle plume that acts like a magmatic blowtorch when a tectonic plate moves over it. Fault = pre-existing stress planes along a rock; boundary line between 2 plates. Hanging wall slides down from gravitational pull.
