Hi When I read the Stephenson probe description at the NZ web site, I get a strong impression that the novelty is in the small size of the sensor rather than the installation method. If you look through some of the publications on the site and search elsewhere on the net, the main technique in penetrometry appears to be the Cone Penetration Test (CPT). You will also find that the CPT has an extensive history. I found one mention of doing CPTs during Apollo mission EVAs. Presumably they were on the moon at the time. :-) If you look at the picture on the web page, Bill Stephenson is holding a very small device in his right hand and the complete package in his left hand. Without accurate dimensions, I'm guessing that the overall package is more narrow than a traditional triaxial geophone sensor. Like Casey, I am curious as to the technology used in the sensor to reduce the size and, as claimed, the cost. The device in Bill's right hand might almost be a chip, so I wonder if he is using a chip similar to the ADXL05 or its kin? Unfortunately the web site has no description of the sensor technology. I checked the NZ and US Patent Office to see if it had been patented, but I couldn't find anything. If anybody else finds anything, please pass it along. Ron __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>