Tōnankai earthquakes
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The Tōnankai earthquakes are major megathrust earthquakes that affect the Tōnankai region (Southeastern Sea) of Japan, between the Tōkai region (Eastern Sea) and Nankaidō (Southern Sea Circuit) region, and are caused by ruptures in the Tōnankai zone of the Nankai megathrust, specifically segments C and/or D.
These are a class of Nankai megathrust earthquakes, frequently occurring in combination with a rupture of segment E (Tōkai zone, yielding Tōkai earthquakes), and either in combination with or followed by a rupture of segment A and/or B (Nankai zone, yielding Nankai earthquakes).[1]
The most notable Tōnankai earthquake, and the only earthquake known to have consisted of ruptures in the Tōnankai zone only, is the 1944 Tōnankai earthquake.[2]