On the basis of the available historical information, the area surrounding the resorvoir of Collalto was regarded as of moderate seismological importance in the past. However, its seismogenic potential significantly increased by the literature appeared in the last decade.
The Collalto Seismic Network consists of ten seismometric stations and one GNSS permanent geodetic station. Figure 1 shows a map of the network, while Table 1 summarizes its peculiar features.
In this section the seismic stations and their sites are described more in detail.
The seismological instrumentation has been bought at the end of a public selection to which the main instrument manufacturers have been invited to participate. The selection has been passed by Guralp Systems Ltd. (http://www.guralp.com), which has offered high quality instrumentation by satisfying completely the required characteristics, with competitive prices. Such a competition has been advertised in August 2010 and the adjudication has been formalized on the 5th October 2010.
The GNSS instrumentation of the SUSE permanent station (Figure 13) is composed by:
- Receiver Topcon GB-1000;
- Antenna Ashtech choke ring ASH701945E_M.
The receiver is a last generation instrument, which acquires signal with a sampling rate of 1 s.
All stations of the Collalto Seismic Network are equipped with a data transmission system including a router with GPRS/EDGE interface (Siemens Er75i; Figure 1), which is more reliable and has less power consumption than other models tested. Instead, for some sites in which a higher bandwidth is required, and the network coverage is poor, a more advanced router with UMTS (Ur5) interface is used.
The main acquisition system dedicated to the Edison project is installed at CRS Department. Its hardware consists of an Apple Mac Pro Server (Figure 1a), with the following technical features:
In the following, files reporting summary information about site conditions and instrumentations are available for both seismic stations (ED01-ED10) and geodetic station (SUSE) belonging to the Collalto Seismic Network. Station files are in Italian.