# Page:Popular Science Monthly Volume 34.djvu/734

taken near enough to the epicentrum to be disturbed, as above assumed, to be equal to 24,000,000,000 foot-pounds. The speed of transmission of this disturbance has been pretty well determined by Newcomb and Sutton to be approximately three miles per second, so that a cubic mile would be disturbed in one third of a second. To do this would require 130,000,000 horse-power. Assuming that an area about the epicentrum 100 miles square was thus disturbed, the energy would be that of 24 ${\displaystyle x}$ 10·13 foot pounds, and the rate of its expenditure would be that of 1,300,000,000,000 horse-power."