"After the strong 6.2 earthquake, numerous tremors have been felt, practically one after the other... 20 or more."
Ivancic said whether aftershocks would be stronger could never be predicted with certainty.
"Now that such a strong earthquake happened, any stronger earthquake that might happen, which need not be stronger than this one, could cause even greater damage to damaged buildings."
Ivancic said aftershocks could occur over a long time, certainly one to two years.