Historical clue formulations

• Enormous in proportion — 2020-10-16
• Huge and abrupt — 2019-06-20
• Earth-shaking — 2015-05-18
• Earth-shattering, maybe — 2014-11-09
• Earth-shaking — 2014-09-01
• Kind of wave — 2012-04-12
• Earthshaking? — 2002-01-24
• Like fault-line activity — 1996-03-19