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Italy was struck by its fourth earthquake in three months on Sunday morning, a 6.6-magnitude tremor which injured twenty people and leveled a historic basilica.

The deadly series of tremors has destroyed many historic buildings and landmarks. The first, in August, killed nearly 300 people and flattened villages around the mountain town of Amatrice.

Sunday's was the strongest to hit the country in more than three decades.

Why has this part of Italy been struck so many times by disastrous quakes? Is this country witnessing a steady increasing in tectonic activity?

 

Will there be more?

It isn't over yet -- aftershocks were still continuing in the region early on Monday morning.

"Following the earthquake there have been hundreds and we've already had 40 today ... I would imagine they would continue," Tatham said.

Hayes at the USGS said the initial quake in August was the start of the current spate of tremors and there could be more to come.

"It's very possible that there will be more, there will certainly be ongoing aftershocks over the comings weeks to possibly months," he said.