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Tectonic Hazards

The effects of and responses to a tectonic hazard

  • 3 things to know
  • Paper 1

Overview

Primary and secondary effects of earthquakes and volcanic eruptions, immediate and long-term responses, and why death tolls, costs and responses differ between wealthy and poorer areas.

What you need to know

Answer each one before you reveal it.

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Key term

How do the primary effects of a tectonic hazard differ from its secondary effects, with an example of each?

Key term

What is meant by a primary effect of an earthquake or eruption?

Key term

Give two primary effects of a strong earthquake.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is meant by a primary effect of an earthquake or eruption?

    Model answer

    A result caused directly by the event itself, such as people killed by falling masonry as the ground shakes.

  2. 2

    Give two primary effects of a strong earthquake.

    Model answer

    Buildings, bridges and roads collapse, and people are killed or injured by the collapsing structures.

  3. 3

    What is meant by a secondary effect?

    Model answer

    A result that follows later as a consequence of the primary damage, such as disease spreading once the water supply has been contaminated.

  4. 4

    Why are fires often listed as a secondary effect of an earthquake?

    Model answer

    Because the shaking first fractures gas pipes and electricity cables, and the fires those broken services start then spread through the wreckage.

  5. 5

    Give one secondary effect of a volcanic eruption on farming.

    Model answer

    Ash falling on the fields smothers crops and kills livestock, so harvests fail and food becomes scarce in the months afterwards.

  6. 6

    What counts as an immediate response, and give two examples.

    Model answer

    Action taken in the hours and days straight after the event, such as searching the rubble for survivors and setting up emergency shelter, food and water.

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