Possible Clues:

• Michael, that sounds the size of it and that'll shake you
• This is earthshaking!
• Hugely important moment involving regular characters in oil summit
• Resulting from earthquakes
• Like great shakes
• Measure of course is microscopic. On the contrary, it's earth-shaking!
• Enormous in proportion
• Having enormous effect
• Shaky's half-seen with one's microphone
• Huge and abrupt