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La 16 mai 1968 s-a produs un cutremur major in Japonia, zona Tokachi-Ochi, cu magnitudinea Mw 8,0-8,2.
http://www.sciencedirect.com/science/article/pii/0040195171900631
The focal mechanism of the Tokachi-Oki earthquake of 1968 (Ms? 8.0) and its aftershocks is studied on the basis of P-wave first motion, S-wave polarization angle, and long-period surface-wave data. The major objective is to understand the nature of the deformation of the oceanic lithosphere at a junction of two trenches. The main shock is interpreted as a low-angle thrust fault with a considerable strike-slip component, the oceanic side underthrusting beneath the continent. This type of faulting is common with other great earthquakes of the northwestern Pacific belt, and is considered to represent a major tectonic movement in this region. The largest aftershock (Ms? 7.5), that occurred about 10 hours after the main shock, suggests a faulting in which the slip direction is almost opposite to that of the main shock. Other aftershocks are grouped into either the main shock type or the largest aftershock type.
https://www.terrapub.co.jp/journals/EPS/pdf/2011/6312/63121213.pdf
http://www.sciencedirect.com/science/article/pii/0040195171900631
The focal mechanism of the Tokachi-Oki earthquake of 1968 (Ms? 8.0) and its aftershocks is studied on the basis of P-wave first motion, S-wave polarization angle, and long-period surface-wave data. The major objective is to understand the nature of the deformation of the oceanic lithosphere at a junction of two trenches. The main shock is interpreted as a low-angle thrust fault with a considerable strike-slip component, the oceanic side underthrusting beneath the continent. This type of faulting is common with other great earthquakes of the northwestern Pacific belt, and is considered to represent a major tectonic movement in this region. The largest aftershock (Ms? 7.5), that occurred about 10 hours after the main shock, suggests a faulting in which the slip direction is almost opposite to that of the main shock. Other aftershocks are grouped into either the main shock type or the largest aftershock type.
https://www.terrapub.co.jp/journals/EPS/pdf/2011/6312/63121213.pdf