"It is possible over the next day or two [there will be more aftershocks] but I would say they will die away reasonably quickly, and people probably won't feel them."
Ms Bland said it was not surprising people reportedly felt the quake as a "surge".
"You tend to lose the high frequency energy the further you are away from the epicentre. That's when you get people saying it felt quite 'rolly'."
She said the quakes were too small to generate tsunami.
"We're always vigilant about that kind of possibility, but 5.8 is really too small to be worrying about a tsunami risk."