Earthquakes . Vibration of Earth produced by the rapid release of energy Associated with movements along faults Explained by the plate tectonics theory Rocks "spring back" ? a phenomena called elastic reboundVibrations (earthquakes) occur as rock elastically returns to its original shape . Earthquakes .
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1. Unit 7: Dynamic Planet: Earthquakes & Volcanoes Lecture 1 Objectives:
E3.4A - Use the distribution of earthquakes and volcanoes to locate and determine the types of plate boundaries.
E2.2C - Describe natural processes in which heat transfer in the Earth occurs by conduction, convection, radiation.
Vibration of Earth produced by the rapid release of energy
Associated with movements along faults
Explained by the plate tectonics theory
Rocks "spring back" – a phenomena called elastic rebound
Vibrations (earthquakes) occur as rock elastically returns to its original shape
3. Earthquakes Locating an earthquake
Earthquake zones are closely correlated with plate boundaries
Oceanic ridge system
4. Magnitude 5 or greater earthquakes over a 10 year period
5. Volcanoes Global distribution of igneous activity is not random
Most volcanoes are located on the margins of the ocean basins (intermediate, andesitic composition)
Second group is confined to the deep ocean basins (basaltic lavas)
Third group includes those found in the interiors of continents
6. Locations of some of Earth’s major volcanoes