Rich·ter scale 
(rĭktər)
(rĭktər)n.
A logarithmic scale used to express the amount of energy released by an earthquake. Its values typically fall between 0 and 9, with each increase of 1 representing a 10-fold increase in energy.
[After Charles Francis Richter (1900-1985), American seismologist.]
- Robert I
- Robert Joseph
- Robert Joseph
- Robert Joseph
- Robert King
- Robert Laird
- Robert Lee
- Robert Louis
- Robert Louis Balfour
- Robert MacGregor.
- Robert Marion
- Robert Mearns
- Robert Moses
- Robert Nesta
- Roberto
- Roberto
- Roberto Walker
- Robert Penn
- Robert R.
- Robert Ranke
- Roberts
- Roberts
- Roberts
- Robert Sengstacke
- Robert Seymour