Seismische Wellen

Underdamped case (ω0 >ε ), result
x r
(t) =
x r0
cosφ e−εt cos( ω 2 0
− ε 2 t − φ)
= x r0
cosφ e−εt cos( ωt − φ)
φ = arcsin ε ω 0
In the underdamped case (h < 1), the seismometer oscillates with the
period T = 2π/ω which is always larger than the undamped natural
period T 0 .