In this paper is investigated the old seismograms of several earthquakes which occurred offshore of Miyagi prefecture in 1933 (June 18, 21:37 UT), 1936 (Nov. 2, 20:45 UT), 1937 (July 26, 19:56 UT), 1978 (June 12, 08:14 UT), and 2005 (Aug. 16, 02:46 UT).

<p>In this and two companion papers (9, 10), is reported on the nature of faulting in these great earthquakes based on seismological analyses of the extensive, openly available seismogram data set from the international Federation of Digital Seismic Networks ...