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T1: Geohazards

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do earthquakes cause hazards, and how is seismic risk measured and reduced?

The causes of earthquakes (elastic rebound, focus and epicentre), seismic waves (P, S and surface waves), the measurement of size (magnitude and intensity), the primary and secondary hazards (ground shaking, liquefaction, landslides, tsunami), and the prediction and mitigation of seismic risk.
A focused WJEC and Eduqas A-Level Geology T1 answer on how earthquakes are generated by elastic rebound, the P, S and surface waves they produce, the measurement of magnitude and intensity, the primary and secondary hazards including ground shaking, liquefaction and tsunami, and how seismic risk is predicted and reduced.
14 min answer →

What causes slope failure and ground subsidence, and how are they managed?

The types of mass movement (rockfall, slide, slump, flow), the factors that control slope stability (slope angle, rock type and structure, water, vegetation, undercutting), the ground hazards of subsidence and collapse (mining, dissolution), and the prediction and prevention of these hazards.
A focused WJEC and Eduqas A-Level Geology T1 answer on the types of mass movement, the factors controlling slope stability (slope angle, rock type and structure, water, vegetation and undercutting), the ground hazards of subsidence and collapse from mining and dissolution, and how these hazards are predicted and prevented.
13 min answer →

What controls volcanic hazards, and how are volcanoes monitored and managed?

The control of magma composition and gas content on eruptive style, the volcanic hazards (lava flows, pyroclastic flows, ash falls, lahars, gases, sector collapse), the monitoring of volcanoes (seismicity, ground deformation, gas, thermal), and the prediction and management of volcanic risk.
A focused WJEC and Eduqas A-Level Geology T1 answer on how magma composition and gas content control eruptive style, the range of volcanic hazards from lava flows to pyroclastic flows, lahars and ash, the methods used to monitor volcanoes, and how volcanic risk is predicted and managed.
14 min answer →