Episode Details

To learn more about this topic, start your googling with these keywords:

• Earthquake: A violent shaking of the earth, usually due to movements of tectonic plates under the earth’s crust.
• Seismometer: An instrument that detects changes in the up-down motion of the earth.
• Seismic body waves: Higher frequency waves released by earthquakes that can move through solid rock.
• Seismic surface waves: Lower frequency waves released by earthquakes that move along the ground and cause most damage.
• Earthquake Early Warning System: A network of strategically placed seismometers that trigger emergency warning systems in particular areas when they detect large seismic body waves.
• Evacuation Clearance Time: The time needed to evacuate a particular population to safety.
• Earthquake Precursor: An anomalous event that gives an effective warning of an impending earthquake.
• Transform Faults: Faults where two tectonic plates slide past each other.

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