. "1868 Hayward earthquake" . . . . . . . . . "1868" . "An earthquake estimated at 6.3\u20136.7 on the moment magnitude scale hits the Bay Area" . "1868 Hayward earthquake" . "Hayward earthquake" . "1868 Hayward" . "1868 Hayward (M6.3\u20136.7)" . "1868-10-21" . "magnitude 6.3\u20136.7 earthquake" . . "earthquake-flood of 1868" . "earthquake in 1868" . "October 21, 1868" . . "1868 earthquake" . "1868 quake" . . "30" . .