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The city wall of Lastra a Signa: integrated digital survey methodologiesThe survey of the Lastra a Signa city walls (built between the second half of 1300 and the first half of 1400) is the result of three different survey campaigns made in 2006-2007-2008 and of the following data processing carried out as part of a Master thesis. It is a paradigmatic example of the overcoming of the concept of “survey as a mere measurement and graphic representation of a certain element”, by using a methodology protocol. At that time, survey operations became more complex because it was necessary to coordinate with a scientific basis the different survey phases: preliminary documentation, data taking with several instruments, data processing, data filing and cataloguing, two-dimensional representation of plans, cross-sections and elevations, wall decay interpretation and building materials analysis. The survey subject became a dynamic and ever-changing process, thanks to the introduction of digital survey and the availability of new technologies. This paper describes the methodologies that were used in each different part of the survey campaign, of the data cataloguing operations and of the representation process, underlining the importance of the strict hierarchy of the acquired and rendered data. This hierarchy allowed to manage information obtained from topographic, laser, direct and photographic survey, and then to discretise, clean, georeference and make two-dimensional representations of the acquired data. Ultimately, it allowed creating a database that contains all these elements and ensures that the archived data can be updated in the future.

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Abstract. The triumphal arch of Caracalla in the Roman archaeological site of Volubilis dates back to 216 AD. It was built in a strategic position at the intersection of the main roads leading to the Forum, the decumanus maximus to the east and the roads from Porte à trios baies to the west, that almost certainly was the main gate to the city. The current arrangement of the monument is the result of a restoration intervention carried out in the 1930s by French restorers. Some ancient photos witness that the monument was just a ruin in 1915, when Chatelain carried out the former archaeological excavations and, as a consequence, that it was totally rebuilt. In fact, the monument suffered wide damages provoked by the 1755 Lisbon earthquake, that affected also Morocco, which almost completely destroyed it. By means of the drawings made by the travelers Henry Boyde and John Windus, that retraced the monument thirty years before the earthquake, the original configuration of the monument can be observed and the timeline of events can be reconstructed. In this paper, the timeline of the seismic events that affected the triumphal arch is reconstructed and investigated by means of a structural analysis based on a rigid-block model. Finally, with the purpose of preventing future damage, the seismic vulnerability level of the construction is assessed with reference to its current configuration.