Civita Guiliana. The city became an important passage for goods that arrived by sea and had to be sent toward Rome or Southern Italy along the nearby Appian Way. Many public buildings were constructed or refurbished and improved under the new order; new buildings included the Amphitheatre of Pompeii in 70 BC, the Forum Baths, and the Odeon. In comparison, the Forum was embellished with the colonnade of Popidius before 80 BC. These buildings raised the status of Pompeii as a cultural centre in the region as it outshone its neighbours in the number of places for entertainment which significantly enhanced the social and economic development of the city. Under Augustus, from about 30 BC, a major expansion in new public buildings, as in the rest of the empire, included the Eumachia Building, the Sanctuary of Augustus and the Macellum. From about 20 BC, Pompeii was fed with running water by a spur from the Serino Aqueduct, built by Marcus Vipsanius Agrippa. In AD 59, there was a serious riot and bloodshed in the amphitheatre between Pompeians and Nucerians (which is recorded in a fresco) and which led the Roman Senate to send the Praetorian Guard to restore order and to ban further events for ten years. 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