Elastic Rebound :
Elastic Rebound The stress between two plates, or on two sides of a fault build up until they slip, releasing all the energy.
Focus; where the slippage occurs
Epicenter; the point on the surface directly above the focus
Slide 3:
Most continental Earthquakes occur within 70 km of surface, shallow focus
70km to 300km intermediate
300km to 650km deep
Earthquake Zone :
Earthquake Zone Pacific Ring of Fire
Mid-Ocean ridges
Eurasian-Melanesian Mountain belt
Fault Zones :
Fault Zones Areas that develop along plate boundaries that are fractured from the stress.
San Andreas
P Waves :
P Waves P waves are the fastest moving 1.7 times faster than S waves
P stands for primary
P waves move through solid and liquid, and move the direction of the wave,
Compression
S waves :
S waves S stands for secondary
S waves cannot move through liquid (center of the Earth) and move rock perpendicular to the wave
L waves :
L waves L stands for long
L waves are the slowest and are caused by P and S waves, that travel over the surface, causing the most damage.
L waves are worse when traveling through liquid soils,
Vertical
Locating Epicenters :
Locating Epicenters Locating the epicenter of an earthquake requires 3 seismographs.
The location is found by comparing the difference in arrival between the P and S waves.