1 S an A n d re a s F a ult Displacement Earth Sciences 1081B: Resources, Environment and Sustainability in a Material Society
2 “E” released as crustal plates slip past one another
Elastic rebound deformed by tectonic forces bend and store elastic energy - strain Frictional resistance holds the rocks together 3 Earthquakes A. Original Position B. Build up of Strain Earthquakes where and why?
4 D. Strain Released What is an Earthquake ?
5 • direction of applied stress • the sense of motion relative to the fault Types of faults and movement based on:
“E” moves in waves Interior : P-waves “Primary” S-waves “Secondary Exterior: Surface waves 6 Energy radiates in all directions from the source Focus earthquake waves originate Epicentre location on the surface directly above the focus
Body waves: travel through Earth’s interior Primary (P) waves: 7
Body waves: travel through Earth’s interior Secondary (S) waves 8
9 Surface; R- waves
Seismology The study of earthquake waves , Seismometers are instruments that record seismic waves 10 Records the movement of Earth in relation to a stationary mass on a rotating drum or magnetic tape
12 A Time Travel Graph: used to locate Distance to epicentre triangulation used to locate epicentre Locating the epicentre of an earthquake
13 Mid-Atlantic Ridge Locating the epicentre Triangulation from 3 stations
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- Fall '11