Hostile Worlds: Earthquake Flashcards
1
Q
What is an earthquake?
A
The sudden movement or fracture , within the Earth. when earth moves this causes vibrations known as earthquake in the form of seismic waves.
2
Q
what is the point in which an earthquake originates?
A
focus
3
Q
What measures the magnitude of a tremor?
A
The Richter Scale
4
Q
What instrument is used to measure the magnitude of a tremor?
A
Seismograph
logarithmic scale
5
Q
what is the focus?
A
the point at which the rock moves
strongest waves start here
6
Q
what is the epicentre?
A
directly above the focus
7
Q
fault line
A
crack or weakness in the crust
8
Q
seismic wave- where?
A
start at the focus
9
Q
What scale is common in LEDC ?
A
Mercali scale
10
Q
What are seismic waves?
A
waves of vibrations
spread out from the focus point
