oa A test site for geophysical methods

This conimunication presents a new facility designed to help the development of geophysical rnethods in urban environment, particularly for trenchless technology applications. It is a test site whose dimensions and consistensy have been thought to provide as perfectly known and noiseless conditions as possible for expenments. The different aspects of this site and the care taken to its construction are indicated in order to invite searchers to use It. Some rough results illustrate the quality of measurement conditions and wide range of possibiities.