How is the 6th seal in Revelation 6:12-17 to be understood?

Mark here that the Greek word "seismos", from which we get the English word seismology, alone only means "shaking". Not necessarily an earthquake.

BQ: What would make man ask the mountains to hide them?
Update: 1 Thessalonians 5 might be a place to look.
Update 2: When studying Revelation it is most interesting to go back to the OT prophets and find how it connects.
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