Possible Clues:

• Two or three on the Richter scale
• That will shake Rome up to the right, a little.
• A slight shake, as of earth
• Little earthquake
• It will shake you how much more there is in this
• Quake aftermath
• 2 or 3 on the Richter scale, maybe
• Shiver in the earth
• Shake this and there's more of it hidden in the end
• Less shake than a quake