winnie - the subduction zone has been loading from multiple locations. No one fault/quake will load the whole plate.
I only commented in regards to your statement that you gained your ‘information’ from some webcorders. I certainly hope you look elsewhere.
Not saying that at all zilla...
A forequake of this magnitude can signal that the tension/load is increasing in such a manner as to snap. Even more suspicious being a strike slip. It matters not..for if it is a prequake....who cares for the main shock can not be forecasted nor timed.
I see you are the same Zilla....lol
Have a great night bud...going fishing in the Atlantic tomorrow...lol