Triangulation Flashcards

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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.

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2
Q

What does the S-P interval tell a seismologist?

A

How far away the earthquake was.

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3
Q

What is the amplitude of a seismic wave?

A

The amount the ground moves as the wave passes by.

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4
Q

What does amplitude look like on a seismogram.

A

The height of the wave from resting.

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5
Q

What is triangulation used for?

A

To locate the epicentre of an earthquake.

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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
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7
Q

What is S-P time?

A

The time difference between the arrival o the primary and secondary waves.

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