## 1 Introduction  
The new technologies that replace 20 th-century field tools are the smartphone, handheld Global Navigation Satellite System (GNSS), tablets, iPad, and drones. Last generation tablets, in particular, offer performances of a hand-compass, plus take pictures and act as both a notebook and mapping device, and gather precise location data using GNSS. They can even be equipped with GIS software. The impressive technological development characterizing the current times have also brought significant improvement in field mapping techniques. The \"classical\" geological survey can now be integrated by digital mapping carried out using several types of devices, like tablets with dedicated software, and in some particular contexts, by the acquisition of images by drones [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14]. This work provides a workflow for drone remote-sensing and structural-geological mapping, which offer significant advantages compared to the traditional fieldwork. The collected data enable us to reconstruct three-dimensional models of inaccessible outcrops and to explore in detail areas which, during a repetitive seismic activity, might be affected by rock falls (cliffs or outcrops at the foot of prominent fault scarp).  
Furthermore, compared to the traditional methods that employ compass-clinometer and field book, digital mapping, performed either with tablets and/or drones, allow collecting an enormously greater number of data, thanks to the fast and continuous acquisition procedure and the automatic georeferencing. As an example, more than 4000 survey data, as type of rupture, attitude, kinematics, slip vector (obtained from coseismic slickenlines or piercing points), and displacement (throw, opening, and net displacement) were acquired along the Mt Vettore-Mt Bove Fault (VBF) over a total length of about 30 km, immediately after the two major seismic events. The survey was performed at a high resolution, with a sampling rate of at least one site per 50 m, and locally of three sites per meter. All data reported and discussed in [PERSON] et al. [15] has been collected through the Fieldmove app installed on iPad dispositive. During the aforementioned survey, the traditional mapping methods were supported by digital technologies, such as digital field mapping and drone-aided survey, which turned out to be useful to sensibly reduce the working time and to collect such massive field datasets.  
Furthermore, the use of multiple work tools, even on the same site, has allowed us to compare the effectiveness of the various applied methods and, at the same time, making cross-checks to test their reliability.  
Here, we report on the results of the high-resolution structural mapping of the coseismic ground deformations due to surface faulting that followed the strongest events of the 2016 Central Italy seismic sequence, which are the August 24, Mw 6.0, Amatrice; and the October 30, Mw 6.5, Norcia earthquakes.  
In this work, we explored the advantage, conditions of applicability, and limits of the proposed novel approach to map and parameterize the coseismic ruptures, hundreds of meters or kilometers long, occurring along two synthetic relays of the VBF herein referred to as Colli Alti e Bassi (CAB) and Prate Pala (PTP) faults. The CAB had been known for a long time in published geological maps, thanks to its excellent surface exposure; the second was unveiled by recent paleoseismological research [16], which highlighted at least three reactivations during the Holocene.  
Along these faults, where a detailed survey of coseismic ruptures was available [15], the quality of the results here obtained through high-resolution aerial photogrammetric images acquired using a small-size low-cost drone, has been tested and discussed.