However, the seismic crisis in the region started nine days earlier with a magnitude 7.4 earthquake and approximately 220 aftershocks in a few days and concentrated in the northern part of the 8.8 magnitude rupture zone.

Tsunami visible sur le marégraphe de Nuku Hiva d'après les données temps réel du SHOM
services.data.shom.fr/maregraphie/...

Finally, the seismic signal at ANGG station in #Greenland confirms the seismic origin of this event with nice P and S seismic waves and an aftershock 5 minutes later.

However, there has been few earthquakes in this area in the past so let's see...