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WalesGeologyQuick questions
T1: Geohazards
Quick questions on Earthquake hazards and seismic risk - WJEC A-Level Geology
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are seismic waves?Show answer
Three wave types carry the energy:
What is measuring size?Show answer
Magnitude measures the energy released at the source on a logarithmic scale (such as moment magnitude); it is a single number for the whole event. Intensity measures the shaking and effects at a place (such as the Mercalli scale); it varies with distance, ground conditions and construction, so one earthquake has many intensity values.
What are hazards?Show answer
The primary hazard is ground shaking, the direct effect of the passing waves, which collapses structures. Secondary hazards are triggered by the shaking:
What is q1?Show answer
Distinguish the focus from the epicentre of an earthquake. [2 marks]
What is q2?Show answer
Explain the difference between magnitude and intensity. [2 marks]
What is q3?Show answer
Describe what happens during liquefaction and why it is hazardous. [2 marks]
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