Change Equation
Select an equation to solve for a different unknown

Dr. Charles Richter and Wood-Anderson seismograph method

	earthquake magnitude
	amplitude
	distance correction factor

Richter and Gutenberg seismic energy method

	seismic energy
	earthquake magnitude

Seismic Moment

	seismic moment
	rock rigidity
	fault area
	slip distance length

seismic moment and magnitude relationship

	earthquake magnitude
	seismic moment

Dr. Kanamori seismic energy method

	seismic energy
	seismic moment