A seismologist at the British Geological Survey says experts can't exclude the possibility that there will be more, or even stronger, aftershocks in the area near Norcia in central Italy.
Margarita Segou told The Associated Press that the important thing to realize is that while the number of temblors will decline over time, "we cannot exclude the possibility of larger magnitude aftershocks.''
She cited other regions, such as a series of quakes in Japan earlier this year, which saw a similar pattern in which a quake is followed by a larger aftershock.
The quake Sunday that struck near Norcia in central Italy measured magnitude 6.6 and was the strongest to hit the country in 36 years.
Meantime, Prime Minister Matteo Renzi has vowed that Italy will rebuild the homes, churches and other structures destroyed in the country's latest earthquake.
Renzi spoke Sunday hours after the latest quake, which followed a deadly quake on August 24 and powerful aftershocks on Wednesday that left thousands homeless.
He said the financial resources will be found to restore essential elements of the national identity.
Among the structures that have been lost are churches, bell towers and other examples of Italy's cultural heritage.
Sunday's quake damaged historic churches in the town of Norcia, including the 14th century St. Benedict cathedral in one of the city's main piazza.
Renzi said at a news conference: "We will rebuild everything, the houses, the churches, the shops. We are dealing (with) marvelous territories, territories of beauty.''