Recently the use of seismic and infrasonic recordings has proven to be a powerful tool for studying and monitoring debris flows. ĭebris flows are among the most dangerous phenomena in mountain environment. On 5 July 1995, 22 June and 8 July 1996 three debris flows occurred in the Moscardo Torrent that were recorded by the previously described seismic. , 1997), it was considered easier to install the network and wait for the occurrence of a debris flow. Some tests might have been performed to verify the quality of the recordings, making some large boulder roll in the torrent to simulate a debris flow, but considering the difficulties involved in reaching the torrent with a bulldozer and, on the other side, knowing the high frequency of the events in the Moscardo Torrent (Arattano et al. These latter were thus placed at a distance of about 20 meters from the torrent bed, on the border of the road that flanked it, that is in the closest available position that could still be considered safe enough ( Figure 5). The installation of the detectors directly in the torrent bed was not possible in this case for debris flows are known to produce often severe erosions and these erosions might have damaged, destroyed or even swept away the sensors. No information was available about the minimum distance from the torrent bed needed to guarantee a satisfactory recording of debris flows, except that in previous experiences regarding the monitoring of bed load transport only detectors directly placed in the stream bed had been found capable of recording ground vibrations (Govi et al. provided by a continuous tape recorder was preferred in this first phase of research.
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