E infine, questa frase nella quale si indica esplicitamente che il valore minimo da considerare nelle analisi di RSL, il nostro lower bound di Do, è nella maggior parte dei casi 2%

Quote:
A final interesting observation is that in all our experiments on soils performed under microtremor conditions (ε¼ 10—4), the minimum damping value, which we called the ‘base level’, that could be measured at the geophysical scale at any frequency below 10 Hz was hardly lower than 2% (which means a 13% amplitude
decay per cycle). On structures, the ‘base damping level’ was found to be a little larger (2.5–3%, which means 17–20% amplitude decay per cycle). These values somehow depend on the threshold dis- placement selected for the calculations of the decrement signature but can be considered the minimum damping values under low strain (standard operative conditions, amplitude noise spectrum 410—3 mm in the [0.1, 1] Hz interval) in the seismolo- gical and seismic engineering problems at the sample scale of 10– 1000 m.

"Data speak for themselves" -Reverend Thomas Bayes 1702-1761
P(Ai|E)=(P(E|Ai)P(Ai))/P(E)