Hi Jeanine,

Yes those are aftershocks. Really foreshocks, mainshocks, and aftershocks are still all individual quakes. Some quakes occur without foreshocks and some quakes occur with almost no aftershocks or a very robust sequence of aftershocks. Each foreshock was at one time the mainshock, but when a subsequent quake occurs that is larger then the one before, it becomes the mainshock. Each subsequent quake that is smaller then the mainshock is an aftershock. If we get a quake larger then the M7.1 in the same area, the M7.1 would become a foreshock, God forbid.

Also, to be classified as a foreshock or aftershock, those quakes would have to be in or close to the vicinity of the aftershock zone of the mainshock. But you can get sympathy quakes just outside that zone. That aftershock zone, roughly speaking, is determined by the area covered by the rupture of the mainshock.

Dennis