Kerry E. Sieh is an American geologist and seismologist... (wikipedia)
This earthquake didn't just break all the records, it also broke some of the rules.
This looks like a fraternal twin of the December 26 earthquake.
It's not a duplicate. It occurred a little bit further south. But it's the same type of earthquake.
If nothing ruptured, then that's really good news for the engineers who were trying to make it in fact so that it wouldn't.