- What?
- Slip on a fault
- ...generates seismic waves

Click for fault slip & waves

- Where?
- Mostly plate boundaries
- Mostly subduction zones

Click for global seismicity

- How Big?
- Intensity

Click for Intensity Map of Lansing EQ - Magnitude

Click for the Richter Scale - Fault size & slip

- Intensity
- How Many?
- A few big ones
- ... lots of little ones

Click for number of Earthquakes vs. Magnitude

Connection from Magnitude to Fault Area

...allows a physical interpretation of the Gutenberg-Richter relationship

The Gutenberg-Richter relation in terms of fault area of earthquakes (words)

The Gutenberg-Richter relation in terms of fault area of earthquakes (picture)

- Thus, the numbers of earthquakes versus their fault area is a power law distribution

Review of exponents & logarithms

Power law distribution

two other examples of power law distributions

- When?