A standard earthquake for the region. You can see how small it is relative to the full subduction zone.
It just happened on that little bump. You can see how clean the subduction zone is, and that 'cleaning' only comes from giant M9+ earthquakes. This one probably only had a few centimetres of displacement, whereas the big ones go for metres.
There is the usual very small chance that this is a foreshock to the big one. The main chance is 1 in 500 per year, and this raises things to 1 in 100 for the next few days. An M9 is mainly a tsunami hazard, it doesn't do that much shaking.
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