●◎●平安時代前期、貞観時代（859-877年）前後の地震史と現代との対比●◎●

首都圏直下型地震が５年以内に起きる確率が２８％
https://rio2016.5ch.net/test/read.cgi/lifeline/1328549196/487-488,490
https://rio2016.5ch.net/test/read.cgi/lifeline/1328549196/487-488,490,471-474,476-479,484,486,491,501,518,525,526,536,537-540,542,544,545,546-549,550,553-588,590-596,601