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Permanent Strong Motion Array
 

A large number of observational studies have striven to evaluate the importance of the different factors involved in site response of soft soils. However, there is a long way to go to reach a point where site effects would be incorporated in future aseismic design codes. One important reason is the very few cases in which there are available high quality earthquake observations and detailed knowledge of subsoil geometry and soil properties. In order to assist the investigation of different open problems in earthquake engineering and engineering seismology, including -of course- site effects, it is deemed necessary to extent the already existing permanent strong motion network.

The final layout of this network will be comprised of 15 surface high resolution accelerographs in a quasi cross-shaped array covering the central part of the Mygdonian basin, a downhole array at the center of the valley at site TST and another one at site PRO at the northern edge of the array.

The down-hole array at TST (center of the valley consists of:

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a 18-channel device Mt.Whitney with GPS

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Telecommunication with stable phone line made by the Organization of National Telecom-munications of Greece

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a 3D surface accelerometer which substituted an existing ETNA

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an existing DH–17m accelerometer

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a new DH accelerometer at –40m

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an existing DH sensor at –72m (retrieval & reparation)

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two new DH accelerometers at –140m and –200m depths

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A new pore-pressure probe at –10 m depth

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An existing pore-pressure probe at –17m depth

 The Down-hole array at PRO consists of:

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a Guralp 24bits 6-channel recording system with GPS receiver and a surface accelerometer (free field conditions).

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a downhole sensor at –55m depth
 

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Downhole array at site TST (Test Site)



Downhole array at site PRO (Profitis)


Plan view of the array

 

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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.