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Big-shots experiment (December, 1, 2003).

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Location: Euroseis-Test Site

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Scope:  

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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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Downloads:  Video (*.mov, 2.50MB. Quick Time Format)

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Further Information:
raptakis@geo.civil.auth.gr
asextos@geo.civil.auth.gr

 

 
 

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 Copyright © 2003-2004 by Aristotle University Thessaloniki, Dept. of Civil Eng., Lab. of Soil Mechanics and Foundation Eng.. All rights reserved.
Last Update: 27/02/04.