Earthquake Magnitude Scale Magnitude Earthquake Effects Estimated Number Each Year 2.5 or less Usually not felt, but can be recorded by seismograph. Millions 2.5 to 5.4 Often felt, but only causes ...

the apparent magnitude scale allows us to compare how bright stars and other celestial objects appear in the night sky. While ...

Although the Richter Scale laid the foundation for modern seismology, it is no longer the primary tool scientists use to report an earthquake’s magnitude. Today, researchers use more advanced ...