"1993 Okushiri earthquake" . "a devastating earthquake" . "Hokkaido earthquake" . . . "Southwest Hokkaido Open Sea earthquake" . . . . . . . . . . . "Japan" . "1993" . . . "six months later" . "an earthquake on July 12, 1993" . "1993 Hokkaid\u014D earthquake" . "tsunami" . . . "1993 southwest off Hokkaido earthquake" . "230" . . . "Hokkaido Nansei-oki Earthquake" . . . "Hokkaid\u014D earthquake" . "1993, an earthquake" . "1993 Okushiri earthquake" . . . "1993 Hokkaido earthquake" . . "earthquake on July 12, 1993" . .