from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The frequency or magnitude of earthquake activity in a given area.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. factor of how seismic a region is. How prone it is to earthquakes.
from The Century Dictionary and Cyclopedia
- n. The ratio between the number of earthquakes in a region and the area of the region.
Sorry, no etymologies found.