Japan spent $1 billion to rebuild and fortify the island of Okushiri after an earthquake and tsunami struck in 1993, killing nearly 200 people.Credit...Hiroyuki Ito for The New York Times OKUSHIRI, Japan — On the night of July 12, 1993, the remote island of Okushiri was ripped apart by a huge earthquake and tsunami that now seem an eerie harbinger of the much larger disaster that struck northeaste