Related Clues:

• Quake aftershock
• Richter scale blip
• Quavering note
• Small quake
• No great shake?
• Cause of a low Richter reading
• Earth shaker
• Seismic event
• Sing like the birds
• Soprano's skill
• Coloratura's quaver
• Fault symptom
• Two or three on the Richter scale
• Warbler's sound
• Little earthquake