Related Clues:

• Shake
• Sing like a bird
• Pronounce an 'r' like a Scot
• Warble
• Earth mover
• Richter scale reading
• Nervous excitement
• Warbling sound
• Mild quake
• Pre-eruption warning
• Slight quake
• It's earthshaking
• Earthquake's onset
• Feature of bird song
• Small shake