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Unit E: Earthquakes

The Layered Earth: Unit E, Earthquakes. Lesson Key Concepts. E1: Earthquakes and Faults. What is an Earthquake? Key Concepts: Earthquakes are caused by the interaction of Earth's plates. The sudden release of that stored energy, in the form of movement along the fault, produces an earthquake. E2: Earthquake Waves. How is energy transmitted during an earthquake? Key Concepts: Earthquake surface waves travel through Earth's outer layer. Earthquake waves that travel through the Earth's interior are subdivided into primary (p) and secondary (s) waves. E3: Earthquake Epicentre. How is the point of origin of an earthquake determined? Key Concepts: The knowledge of earthquake waves and their speed can be used to locate the epicenter and hypocenter of an earthquake. The severity of an earthquake is governed by factors such as distance from the epicenter and hypocenter, local geology and type of construction used in the area. E4: Living with Earthquakes. What is the impact of earthquakes on society? Key Concepts: Earthquakes have major impacts on society. Technology can be used to limit the effects of earthquakes on society.