Our engineers with researchers of “Center for Seismological Research (CRS)” of the OGS – Udine, carried out tests on the SismAlarm. The purpose of the evidence is to test the “Guardian SismAlarm 5.0” device on a vibrating table. The tests are targeted to define the minimum frequencies of oscillations and the sensitivity on the acceleration values detectable by the SismAlarm. These data are compared with those detected by the professional instrument with which the vibrating table is equipped; finally, data of two real earthquakes are simulated with the two instruments to verify and compare the results.
The SismAlarm gave exceptional results comparable to those of professional instruments, being able to go down a lot in frequency (0.1Hz) and detecting oscillations with very low intensity (0,04m/s2 ≃ 0,041g).
Analyzing the data in the frequency domain, we can still distinguish seismic waves from disturbances as they have significantly different frequencies.
By applying special data analysis strategies, we can distinguish between disturbances and anthropomorphic actions, even low intensity seismic events.