Geoscience Reference
In-Depth Information
Inside the sedimentary basin, a well designed 3D permanent strong motion array with
an X shape and almost equidistant stations covers its central part. The array covers a
surface of about 6km
8km. At the intersection-point a dense downhole vertical array
of six 3D accelerometers (at depths of 0, 21, 40, 72, 136, and 196m) connected to the
same18channelacquisitionsystem,givesthethirddimensionofthisarray.Attheoutcrop
rocksite,operatesa2-3Dsensordownholeverticalarray.Allthe20instruments(surface
and downhole) of the array (Figure 5.4) are digital accelerographs with A/D converters
larger than18 bits, supported byGPS, permanent remote monitoring and power supply.
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In the middle of the basin, very close to the downhole array site, a system of well instru-
mented structural models (six-storey R/C model 1:3 building and a pier bridge) are con-
structed and instrumented operating on a permanent basis (Figure 5.5), providing data
on the structural behaviour, the soil-structure interaction and the wave field generated
around the structures. The permanent accelerograph array comprises Mt. Whitney, K2,
Etna, Guralp CMG-5instruments.
Fig. 5.4. 3Dsketch of thepermanent accelerograph network
Fig. 5.5. Experimental field facilitiestostudy SSI effects and thebehaviour
of RC. structures (Instrumentedfive-storey RC building withmasonry infills
and a pier bridge on surfacefoundation, models' scale 1:3)
