Related Clues:

• Earthquake's onset
• Small shake
• Earthquake warning
• It comes as a shock
• Quiver
• Quaver
• 4.0, maybe
• Earthshaking event?
• Seismographic event
• Seismograph pickup
• Mild aftershock
• Ground shaker
• Maybe a 2 or 3 on the Richter scale
• Shaky motion
• Shudder