Earthquakes.

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Presentation transcript:

Earthquakes

Key terms Stress- the forces acting on an area Strain- the deformation of materials in response to stress Fault- fracture or system of fractures along which movement occurs Focus- point where earthquake originates Epicenter- point on Earth’s surface above the focus

Stress and strain Compression- stress pressing inwards Tension- stress pressing outwards Shear- twisting of material

Types of faults Normal fault- fractures by horizontal tension

Reverse fault Caused due to compression stress

Strike slip fault Caused due to shear stress

San Andreas Fault

Parts of the Earthquake

Types of waves P-Wave Primary waves squeeze rocks in the same direction along which they are traveling

S- wave Secondary waves will cause the rock to move at right angles along the wave Both the p and s wave move along the interior

Surface wave Moves rock along the surface in 2 directions. Up and down and side to side

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