For the moment magnitude scale, I believe the (typical; it doesn’t actually correspond directly to energy release) ratio is even steeper than that, at around a

For the moment magnitude scale, I believe the (typical; it doesn’t actually correspond directly to energy release) ratio is even steeper than that, at around a 32x factor for each point in the scale. So to equal the energy of a 7 you’d need roughly 1 billion magnitude-1 quakes.