The medium of visual representation played a crucial role in the Enlightenment project of taking intellectual possession of nature, and of dominating it. Pictures helped to categorize the various natural phenomena, to disseminate knowledge about their appearance and, so to speak, to capture them on paper or canvas. From the middle of the eighteenth century onwards, natural historians treating extreme and threatening natural phenomena, such as volcanoes, earthquakes, waterspouts or geysers, increasingly supplemented their written accounts with engraved illustrations. In this paper, I concentrate on the visual treatment of earthquakes in learned publications. I discuss two different types of graphic representation of this natural phenomenon, which had always been considered as virtually ‘undepictable’.

After the great earthquake of Lisbon in 1755, research into the subject was greatly stimulated. Two scholars, the British natural philosopher John Michell and the Dutchman Johan Drijfhout, published earthquake treatises in learned journals, and each complemented his text with a diagrammatic illustration. By translating their theoretical considerations into the abstract form of geological sections, these natural philosophers moulded a new visual language for seismology and earth history. An entirely different example of visual representation as a tool in research into earthquakes can be seen in the approach to the earthquake in Calabria in 1783. The Neapolitan Academy of Science and Letters sent some of its members to investigate the devastating effects of this earthquake on the landscape and the nature of the country. The topographical changes were recorded on the spot by trained draughtsmen, with the aim of providing accurate and comprehensive visual documentation. The pictures are remarkable in the way they reveal a conflict between the new demands of modern empirical science and the established ‘picturesque’ conventions of landscape painting.