GEOL 105 : GEOLOGY TEST 3
15 Mar 2019
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Document Summary
I ) earthquakes: trembling or shaking of the ground caused by a sudden release of energy in the rocks. When ground shakes, base plate moves, arm moves, weighs hanging on spring stays still, cillinder moves and pen produces squiggly line. When plates interact the rocks are subjected to stress, they react by either. When rocks crack or shift they release seismic energy. Elastic deformation: ability to bend and & snap back into shape. Builds up in rock, when rock finally breaks each side pops back into regular position and release energy. 1. foreshock: small, creep, leading up to the event: main earthquake. 3. aftershock: smaller, can continue for up to 1-2 years. Rocks can deform only so much before they break. When they break energy is released in the form of seismic waves. 3. seismogram: record that ^ produces , actual line on the graph. Focus: point where energy waves origionate, usually <100km deep.
