## 2 Materials and Methods
### Remotely Acquired Images and Data
#### 2.3.4 Extraction of Fault Slip Data from Cloud Compare  
The Cloud Compare [[[http://www.danielgm.net/cc/](http://www.danielgm.net/cc/)]([http://www.danielgm.net/cc/](http://www.danielgm.net/cc/))] open-source software allowed to perform structural geological analysis of the surveyed coseismic ruptures, directly on a desktop PC. The generated 3D point cloud, including more than 13 million points (Figures 5c and 6), georeferenced in the previous steps, were used to reconstruct the virtual outcrops and for the subsequent kinematic analysis on the fault planes.  
Figure 6: The main steps carried out in Cloud Compare (CC): (**a**) dense-points cloud imported into a CC as ascii file; (**b**) selection of the interest features; (**c**) contour and selection of all the dense-point cloud around the fault plane and extraction, through the plugin qFacets, of all plunge and dip direction in a stereogram; (**d**) from the stereogram the dip directions of the striae, evidenced by grooves, are excluded; (**e,f**) picking of net displacement (mm), striae attitude (trend and plunge), dip direction and dip-ange of the fault plane; (**g**) view of the net displacement and the striae detected on the fault plane; (**h**) export all data in excel,,csv, or.txt format.  
After the processing of the CAB virtual outcrop, the surface of the \(\sim\)15 m long fault mirror was manually extracted from the density point cloud.  
Using the Cloud Compare software, and particularly the plugin qFacets [43] ([[https://www.cloudcompare.org/doc/wiki/index.php?title=Facets_](https://www.cloudcompare.org/doc/wiki/index.php?title=Facets_)]([https://www.cloudcompare.org/doc/wiki/index.php?title=Facets_](https://www.cloudcompare.org/doc/wiki/index.php?title=Facets_))(plugin)), it was possible to make observable the long-term striae through an \"interactive stereogram\" (see inset in Figure 6c,d). In fact, by selecting a narrow range of values of dip direction and dip angle, the plugin makes visible only a few facets of fault plane (i.e., as the ridges in grooves lineations). This application of interactive filtering is exceedingly useful to understand the trend of the lineations on the outcrop in a tridimensional space. After choosing and comparing them with the 30 Octoberoseismic slip vector, measured directly in the field (correlating hanging wall and footwall piercing points), the associated net displacement was assessed. Through a \"virtual compass\" on Cloud Compare, the outcrop orientation was determined, and the use of the \"lineation tool\" allowed the measurement of the height and dip directions of the cooseismic slickenlines. Finally, through Cloud Compare software, all the extracted data obtained from the measurements on the virtual outcrop, were exported in.csv format file, as dip, dip-azimuth, trend and plunge, and plotted onto stereonets for structural analysis.  
The described steps are shown in Figure 6, from dense-point cloud import (a) to the extraction of the fault plane (b), to the measurement of coseismic elements (total or net displacement, c-g) until exporting of the database (h) in excel, csv, or txt format.