At the past PSN meeting at the Berkeley Seismological Laboratory, Robert Uhrhammer told us that their Seismic Pads were made of concrete and sand... No rocks or steel. And the seismometers SAT on the top of block; in other words, they were not attached. Jan _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>