Triangulation Flashcards
1
Q
Explain how to read a seismogram.
A
The earthquake happens at time 0. The P waves arrive first, then the S waves then later on the surface waves.
2
Q
What does the S-P interval tell a seismologist?
A
How far away the earthquake was.
3
Q
What is the amplitude of a seismic wave?
A
The amount the ground moves as the wave passes by.
4
Q
What does amplitude look like on a seismogram.
A
The height of the wave from resting.
5
Q
What is triangulation used for?
A
To locate the epicentre of an earthquake.
6
Q
What are the steps of triangulation?
A
- Find the S-P time
- Use a graph to find the distance from the epicentre
- Using the scale on the map convert actual distance to map distance
- Draw a circle on the map using the map distance as your radius and the seismograph location as the centre
- Where the three circles cross is the location of the epicentre
7
Q
What is S-P time?
A
The time difference between the arrival o the primary and secondary waves.
