"1976 Tangshan earthquake" . "pair of massive earthquakes killed over 240,000 people" . . . "an earthquake" . . "Great Tangshan earthquake" . . . . "Tangshan earthquake" . . "catastrophic earthquake broke out in Tangshan" . "Tangshan Earthquake" . . . . . "earthquake" . . . . . "Hebei Province" . . . "1976 Tangshan earthquake" . . . "242419" . "a 7.5 earthquake" . .