Therefore, this event indicates that earthquakes close to shores can generate huge tsunamis even if magnitudes are not large. The reason of short distance between the shore and the earthquake is that a plate boundary is close to land. So the regions where plate boundaries locate near land have high tsunami risks potentially. This earthquake occurred in or near a plate boundary, but its mechanism might be an inner plate type. Fault models given by some institutes are shown in table 2.
All models has two type faults.
They are a low dip angle fault which indicates a plate boundary earthquake and a high dip angle fault which indicates an inner plate earthquake. Former type faults of each models are different, however, all models have good agreement about latter type fault. If this earthquake was the inner plate type, it can not be included in earthquakes which occurs periodically. And there is a risk that a plate boundary type earthquake will be generated in the near future. Same case was occurred in Japan.