Data Eleven data are available throughout Japan. Mt is greater than Ms by 0.5. The PNG event is considered to be a tsunami earthquake that generates significantly large tsunamis but relatively weak seismic waves. Measured water level which indicates the scale of this tsunami was 10 meters and the maximum was 15 meters. This was too bigger than tsunamis caused by earthquakes of magnitude 7.
Second feature is that the tsunami arrived very small region.
The coastline where water level exceeded 5 meters was 40 km length and the heights exceeded 10 meters along only 20 km coast. Therefore, the huge tsunami attacked very local area. Because this tsunami generated a catastrophic damage as compared with the magnitude of the earthquake, a slow earthquake was supposed. We can image a submarine landslide as a factor of the huge tsunami, and we need to study about bathymetry changes. Another factor is that the tsunami source was close to the shore.