Expect an earthquake in your region soon:

Psalm 77:18
The voice of thy thunder was in the heaven: the lightnings lightened the world: the earth trembled and shook.

Psalm 97:4
His lightnings enlightened the world: the earth saw, and trembled.

Revelation 8:5
And the angel took the censer, and filled it with fire of the altar, and cast it into the earth: and there were voices, and thunderings, and lightnings, and an earthquake.

Revelation 11:19
And the temple of God was opened in heaven, and there was seen in his temple the ark of his testament: and there were lightnings, and voices, and thunderings, and an earthquake, and great hail.

Revelation 16:18
And there were voices, and thunders, and lightnings; and there was a great earthquake, such as was not since men were upon the earth, so mighty an earthquake, and so great.

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What [has been] observed may have been piezo-electric effects associated with earth-stress on a fault line preceeding an earthquake. Thomas Bearden has discussed this at length in his lectures and writings.

http://www.godlikeproductions.com/forum1/message517031/pg1