So you think you’ve got problems… imagine what happens when the earth’s crust is under stress and strain. Learn about the forces that cause earthquakes, and how structural geologists measure them. This episode is guaranteed to give you the shimmy shakes. (Guarantee not legally enforceable, but it’s still pretty cool.)Our main source for this episode is Earth: An Introduction to Physical Geology (9th ed.), by Tarbuck & LutgensMusic for It’s Sedimentary, My Dear is provided by Solar Sleighs.