I Felt by very few people; barely noticeable. II Felt by a few people, especially on upper floors. III Noticeable indoors, especially on upper floors, but may not be recognized as an earthquake. IV ...

Earthquakes are measured using seismographs, which monitor the seismic waves that travel through the Earth after an earthquake strikes. Scientists used the Richter Scale for many years but now largely ...

When the Cape Mendocino earthquake struck on April 25, 1992, magnitude was not the only parameter of interest to seismologists. Until Charles Richter developed a magnitude scale, the primary method of ...