interactive map

Interactive map

Earth’s Crust in Motion

Section 5-1

Earthquake

• Shaking that results from rock movement below Earth’s surface

Stress

Stress

• Force that acts on Earth’s crust to change its shape or volume

3 kinds of stress

1. Shearing• One rock,

Two directions.

3 kinds of stress2. Tension

• Stretches rock

3 kinds of stress

3. Compression• Squeezes rock

Let’s Review!!!

Fault

• Break in rock

• Caused by stress

• Slabs of crust slip past each other

• Usually occur at plate boundaries

3 kinds of FAULTS

1. Shearing → Strike-slip faults• Slip past

sideways, no vertical motion

• “Transform boundary” at plate boundaries

Strike-Slip Fault

Strike-Slip Fault

Strike-Slip Fault

Strike-Slip Fault

3 kinds of FAULTS

2. Tension → Normal faults

• At an angle

• Above fault = Hanging Wall (slips down↓↓)

• Below Fault = Footwall

Normal Fault

Normal Fault

Normal Fault

3 kinds of FAULTS

3. Compression → Reverse faults

• At an angle

• Hanging Wall (slips up↑↑↑)

Reverse Fault

Reverse Fault

Let’s Review1. What kind of fault?

2. What kind of stress?

Let’s Review1. What kind of fault?

2. What kind of stress?

Let’s Review1. What kind of fault? What kind of stress?

Homework: Read 5-1 Complete 5-1 R/R &

Enrich Due Friday