Related Clues:

• It's a fault's fault
• 2 or 3, maybe, on the Richter scale
• Shaking
• Quake
• Sign of nervousness
• Earthquake
• Aftershock
• Shake
• Earth mover
• Richter scale reading
• Nervous excitement
• Mild quake
• Pre-eruption warning
• Slight quake
• Earthquake's onset