Evidence after wegener: distribution of earthquakes and volcanoes

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Presentation transcript:

Evidence after wegener: distribution of earthquakes and volcanoes 2/17/16 Evidence after wegener: distribution of earthquakes and volcanoes Objective: I will explain how the distribution of earthquakes and volcanoes around the world provide evidence for plate tectonics. Page 63

Increase in Technology Global seismic and volcanic data improved in the 60s and 70s Establishment of the Worldwide Standardized Seismograph Network (WWSSN)

Finding a Pattern When looking at global EQ and VOL data, scientists found a pattern EQ and VOL were focused in clusters and bands

Finding a Pattern The patterns aligned with mid-ocean ridges and trenches

Ring of Fire The largest cluster formed lining the Pacific Ocean, known as the "Ring of Fire"

Evidence for Plate Tectonics Scientists developed new ideas about Earth’s crust Concluded that Earth was broken up into plates and the interactions at plate boundaries are responsible for many geologic processes.