Mechanics of Earthquakes On March 11th, at 2:46PM, three giant earthquakes occurred along the edges of the tectonic plates at the ocean bottom on the Pacific coast off the Tohoku (literally meaning “northeast”) Region. Initially it was assumed that there was one big earthquake, but with the analysis of seismic movements, scientists confirmed that there were indeed three gigantic earthquakes occurring in tandem within six minutes of each other, destroying the earth crust in the length of approximately 500 km (310 miles) in length and 200 km in width, similar to the earthquakes off Sumatra in December 2004. The monstrous tremor continued for more than 5 minutes in many locations, which was unprecedented, with a combined magnitude of 9.0. It moved, for example, Oshika Peninsula to the east of Sendai by 5.3m (17’4”) to east-southeast and sank it by 1.2m (47”); and the shift in the land mass increased the oscillation of the earth’s rotational axis by 17cm (6.7 inches) and made the day ...