About 20 hours after the earthquake, the University of Tokyo sent out a follow-up advisory to faculty, students, and staff [1, scroll down for English]. This pa

About 20 hours after the earthquake, the University of Tokyo sent out a follow-up advisory to faculty, students, and staff [1, scroll down for English]. This part hit home with me: “The ‘follow-up earthquake advisory for the Hokkaido and Sanriku Coastal regions’ was established following the earthquake (M7.3) that occurred off the coast of Sanriku on March 9, 2011, two days prior to the Great East Japan Earthquake (Tōhoku Region Pacific Offshore Earthquake) that occurred on March 11, 2011.” I was eating lunch in a fourth-floor restaurant in Nihonbashi, Tokyo, on March 9, 2011, when that preliminary tremor occurred. I had felt many earthquakes before, but that one seemed different: longer, slower, creepier. It didn’t cause any damage, but I often recalled it after the much bigger one struck two days later. (I missed the March 11 quake, as I happened to leave for Osaka just a few hours before it hit. My office back in Tokyo was damaged, though.) [1] https://kankyoanzen.adm.u-tokyo.ac.jp/%e5%8c%97%e6%b5%b7%e9%81%93%e3%83%bb%e4%b8%89%e9%99%b8%e6%b2%96%e5%be%8c%e7%99%ba%e5%9c%b0%e9%9c%87%e6%b3%a8%e6%84%8f%e6%83%85%e5%a0%b1%e3%81%b8%e3%81%ae%e5%af%be%e5%bf%9c%e3%81%ab%e3%81%a4%e3%81%84/ https://kankyoanzen.adm.u-tokyo.ac.jp/%e5%8c%97%e6%b5%b7%e9%...