Mechanical filters using cantilever springs as elastic elements have been developed for the seismic isolation system of the VIRGO gravitational wave detector. A two-stage suspension has been built in order to study how the attenuation performances of individual filters combine when the filters are cascaded. An attenuation ⩾80 dBin the vertical direction and ⩾110 dBin the horizontal direction has been attained for frequencies above 10 Hz.

1.
VIRGO Collaboration, Proposal for the construction of a large interferometric detector of Gravitational waves (1989).
2.
VIRGO collaboration, Final Conceptual Design (1992).
3.
R.
Del Fabbro
A.
Di Virgilio
,
A.
Giazotto
,
H.
Kautsky
,
V.
Montelatici
, and
D.
Passuello
,
Phys. Lett. A
133
,
471
(
1988
).
4.
S.
Braccini
et al.,
Rev. Sci. Instrum.
67
,
2899
(
1996
).
5.
E.
Coccia
,
Rev. Sci. Instrum.
53
,
148
(
1982
).
6.
L.
Ju
and
D. G.
Blair
,
Rev. Sci. Instrum.
65
,
3482
(
1994
).
7.
S.
Braccini
C.
Bradaschia
,
M.
Cobal
,
R.
Del Fabbro
,
A.
Di Virgilio
,
R.
Flaminio
,
A.
Giazotto
,
H.
Kautsky
,
M.
Morganti
, and
D.
Passuello
,
Rev. Sci. Instrum.
64
,
310
(
1993
).
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