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Big-shots experiment
(December, 1, 2003).
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To define the stratigraphy of the sedimentary deposits
in terms of Vp and Vs velocities down to the basement between TST-BRG. |
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To obtain recordings of ambient noise with the aim to
define soil properties and site response. |
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To study many specific topics on earthquake and
geophysical engineering (wave propagation, spatial variability, etc) |
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To complete the 3D soil structure information of the
valley. |
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To verify the operational level of the recording devices on
and around the model structure for use in the next experiment. |
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Participants:
Laboratory of Soil Mechanics and Foundation Engineering (AUTH-LSMFE),
Laboratory of Strength of Materials (AUTH-LSM),
Geophysical Laboratory
(AUTH-GL), Institute for Engineering Seismology and Earthquake
Engineering (ITSAK), RWTH-Aachen -
Lehrstuhl für Baustatik und Baudynamik,
Laboratoire Central Des Ponts-Et-Chaussées, Institut Cartographic De
Catalunya, Universita’ Degli Studi Di Trieste, The University Of Tokyo,
Comenius University, Joint Research Center of the European Commission.
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Layout of the Recordings obtained:
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Two
boreholes of 30m depth were drilled beyond the edges of this long
linear array in order to detonate 37.5 kg of explosions each time
used as seismic sources. |
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The
long reverse linear seismic profile (fig.
1) was deployed using 17 Reftek seismographs with CMG-40T
broadband sensors (fig. 2), 11 Reftek with CMG-5 sensors, 5 Guralp
accelerographs and 4 Etna and K2 accelerographs covering a distance
of 3.895 m . |
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Moreover,
two shorter linear arrays composed of 24 geophones each one, were
deployed for 0.5 km long, at the edges of the linear array (fig.
2). |
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A sorter
linear array was deployed close to the 5 storey model structure. Acceleration was recorded on
this structure and velocity was
recorded at the instruments around the structure and along the axis
between the explosion location and the test site. The layout of the surface
instruments is shown below (fig. 2). |
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Level of Excitation:
Maximum horizontal acceleration of 0.08g and
vertical acceleration of the order of 0.7g was recorded at the
vicinity of the structure |
Figure 1
 
Figure
2
Figure 3
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