In Our Time Seismology
Apr 7, 2022
Rebecca Bell, a Senior Lecturer in Geology and Geophysics, Zoe Mildon, a Lecturer in Earth Sciences, and James Hammond, a Reader in Geophysics, dive deep into seismology. They discuss the historical impact of the 1755 Lisbon earthquake and its role in shaping modern seismology. The conversation unveils the mechanics of seismic waves and how they reveal Earth's internal structure. They also explore challenges in earthquake prediction and essential safety techniques like 'drop, cover, hold' for disaster preparedness.
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Earthquake Origins
- Earthquakes are caused by the movement and collision of tectonic plates.
- These plates cover the entire planet and constantly interact, releasing energy.
Seismometer Mechanics
- Seismometers measure ground motion using a suspended mass and a recording device.
- Modern seismometers use magnets and coils to generate electrical current, digitizing the readings.
Creating Seismic Waves
- Rebecca Bell describes herself as an active source seismologist, creating seismic waves.
- Methods include dropping weights, using vibrating trucks, or even dynamite, but with less energy than earthquakes.