Definitions Flashcards
1
Q
Epicenter
A
Point on earth surface directly above the focus
2
Q
Focus
A
Source of earthquake or hypocenter
3
Q
Focal depth
A
Depth from earth surface to focus
4
Q
Subduction
A
When plates converge, one dips down and slides beneath the other
5
Q
Dip slip fault
A
Movement is vertical
6
Q
Normal fault
A
Hanging wall moves down relative to the foot wall
7
Q
Reverse fault
A
Thrust fault- hanging wall moves up relative to foot wall
8
Q
San Andreas fault
A
Right lateral fault
9
Q
Compression waves
A
- can pass through earth core
- High speed
- P-waves
Reach surface first
10
Q
Shear waves
A
- Transverse waves
- Slow
- S-waves
- Reach surface later
- Transmit more energy than P-waves
- Cause most damage
11
Q
Surface wave
A
- R- waves
- L-waves
- Arrive after P and S waves
12
Q
Intensity
A
Based on damage and other observed effects in people, buildings,and other features
13
Q
Accelerometer
A
Seismometer mounted to building to record large accelerations
Triggered by P wave
14
Q
Tilt meter
A
Installed in ground works like carpenters level
15
Q
Magnometer
A
Measures strain of rock under pressure
