David Milne suggests a machine that could measure seismic activity

Developed theories about earthquakes movements

Discovered that earthquakes usually occur around fault lines

First U.S. Seismograph installed at Lick University

Giuseppe Mercalli creates the Intensity Scale that measures the damage that my be caused in an earthquake

Hypothesized that earthquakes were likely the result of buildup pressure along fault lines.

Andrija Mohorvii discovered there was a boundary between the earth crust and mantle, naming it the Moho Boundary.

Charles Richter creates the Richter scale to measure the intensity of earthquakes