> "You'd have to go a long way from the San Francisco Bay to be a safe distance away from the fault line" Is there an equation that's useful in working out how

> "You'd have to go a long way from the San Francisco Bay to be a safe distance away from the fault line" Is there an equation that's useful in working out how the strength of an earthquake changes as you move further away from a fault line? I tried to find one, but haven't had any luck yet.