On 7 June 1692, a violent earthquake struck Port Royal. Two-thirds of the town sank into the sea immediately after the main shock. According to Robert Renny in his 'An History of Jamaica' (1807): "All the wharves sunk at once, and in the space of two minutes, nine-tenths of the city were covered with water, which was raised to such a height, that it entered the uppermost rooms of the few houses which were left standing. The tops of the highest houses, were visible in the water, and surrounded by the masts of vessels, which had been sunk along with them." Before the earthquake, the town consisted of 6,500 inhabitants living in about 2,000 buildings, many constructed of brick and with more than one storey, and all built on loose sand. During the shaking, the sand liquefied and the buildings, along with their occupants, appeared to flow into the sea.