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The characteristics of anomalous radio propagation in the frequency 1 -30 MHz before and after the 2011 Tohoku-Oki earthquake are firstly revealed by using oblique ionograms for the pass from Wakkanai to Kokubunji which is closest to the epicenter. An oblique ionogram with a wavy-shape-trace was observed at 06:30 UTC on 11 March 2011 after the 2011 Tohoku-Oki earthquake. The velocity of northward-propagating disturbance caused this wavy-shape-trace is estimated to be 130 m/s. Thisdoi:10.4236/ojer.2020.92007 fatcat:lxk4tkqov5gvxinkff4lffvn5i