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AD 62–79

The inhabitants of Pompeii had long been used to minor earthquakes (indeed, the writer Pliny the Younger wrote that earth tremors "were not particularly alarming because they are frequent in Campania"), but on 5 February 62 a severe earthquake did considerable damage around the bay, and particularly to Pompeii. It is believed that the earthquake would have registered between 5 and 6 on the Richter magnitude scale.

On that day in Pompeii, there were to be two sacrifices, as it was the anniversary of Augustus being named Pater Patriae ("Father of the Country") and also a feast day to honour the guardian spirits of the city. Chaos followed the earthquake; fires caused by oil lamps that had fallen during the quake added to the panic. The nearby cities of Herculaneum and Nuceria were also affected.

Between 62 AD and the eruption in 79 AD, most rebuilding was done in the private sector and older, damaged frescoes were often covered with newer ones, for example. In the public sector, the opportunity was taken to improve buildings and the city plan, e.g. in the Forum.

An important field of current research concerns structures that were restored between the earthquake of 62 and the eruption. It was thought until recently that some of the damage had still not been repaired at the time of the eruption, but this is doubtful as the evidence of missing forum statues and marble wall veneers are most likely due to robbers after the city's burial. The public buildings on the east side of the Forum were largely restored and were enhanced by beautiful marble veneers and other modifications to the architecture.

Some buildings like the Central Baths were only started after the earthquake and were built to enhance the city with modern developments in their architecture, as had been done in Rome, in terms of wall-heating and window glass, and with well-lit spacious rooms. The new baths took over a whole insula by demolishing houses, which may have been made easier by the earthquake that had damaged these houses. This shows that the city was still flourishing rather than struggling to recover from the earthquake.

In about 64, Nero and his wife Poppaea visited Pompeii and made gifts to the temple of Venus (the city's patron deity), probably when he performed in the theatre of Naples.

By 79, Pompeii had a population of 20,000, which had prospered from the region's renowned agricultural fertility and favourable location, although more recent estimates are up to 11,500 based on household counts.