In a message dated 1/10/00 12:00:31 PM Pacific Standard Time, ChrisAtUpw@....... writes: > > Are you saying that a hydraulic shaker table can't be used to determine > the overall response of a geophone? > > I wasn't proposing to drop water or beads. Injecting one ml of water > into > a li-lo cushion would move a geophone placed on top upwards by about 10 > microns. It can easily be made a lot less. > I am not familar with a li-lo cushion. Al I know is that the experiments I made at an oil company research center for years showed me that any motion made to a geophone recorded data from the surrounding enviroment. We had a heavy cement shake table and kept recording reflections and refractions from the sides and bottom of the table. Recording the step function response worked very well and was cheep to do. George Erich on the + side http://hometown.aol.com/gee777/myhomepage/profile.html _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>