Triangulation
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Explain how to read a seismogram.
The earthquake happens at time 0. The P waves arrive first, then the S waves then later on the surface waves.
What does the S-P interval tell a seismologist?
How far away the earthquake was.
What is the amplitude of a seismic wave?
The amount the ground moves as the wave passes by.
What does amplitude look like on a seismogram.
The height of the wave from resting.
What is triangulation used for?
To locate the epicentre of an earthquake.
What are the steps of triangulation?
• 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
What is S-P time?
The time difference between the arrival o the primary and secondary waves.