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Apuntes

• Subtopic: The Lisbon Earthquake of 1755 The Lisbon earthquake of 1755 originated at a similar distance from Cadiz as from Lisbon. Listen and then answer the questions: a. On which plate boundary do you think the epicenter was? b. Write the probable number of deaths in each city. How do we explain the great difference in casualties? • Subtopic: How Do Earthquakes Occur? Earth's surface is subjected to stress, and when this is too much for the rocks to bear, energy is abruptly released and transmitted in the form of seismic waves. Earthquakes or tremors are associated with fault movements on or near plate boundaries. The seismic focus, where the earthquake occurs under the ground, is called the hypocenter, and its vertical place on the surface is the epicenter. An earthquake that occurs underwater can lead to a seaquake or tsunami. As well as seismographs that detect earthquakes, tsunami warning systems include surface buoy systems and pressure sensors on the seabed that can record their path. • Subtopic: The Destructive Capacity of an Earthquake There are two fundamental factors: - Magnitude: The amount of total energy released, measured on the Richter scale. This isn't a...