Scientists study and record seismic data and volcanic activity in order to support the theory of plate tectonics. The evidence proves that there is a direct relationship between seismic activity, volcanic activity, and lithospheric plate boundaries.
Seismic data From Earthquakes and Plate Tectonics:
- Along divergent boundaries like the Mid-Atlantic Ridge earthquakes are common, but only in a narrow area close to the ridge, and consistently at less than 18.5 miles deep which is not considered very deep at all.
- Shallow earthquakes are also common along transform faults, such as the San Andreas Fault in California.
- Along subduction zones at convergent boundaries, however, earthquakes are very abundant, and they are increasingly deep on the landward side of the subduction zone.
- The interaction along plate boundaries results in an increased frequency or number of earthquakes at those locations.
- Stronger earthquakes are more likely to occur along active plate boundaries.
- Stronger earthquakes are more common at transform and convergent plate boundaries.
The location of some major earthquakes across the globe is shown in the diagram below.
It is relatively easy to see the relationships between earthquakes and the plate boundaries.
Video Guide:
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Topic Tips
- Earthquakes typically occur along plate boundaries.