In a message dated 26/01/00 20:52:58 GMT Standard Time, sean@........... writes: << In fact, the broadband response at the short period/high frequency end can cause problems with local site noise. My site here in the basement is about 15 meters from a busy street.... Since I am using a vertical sensor, the long period noise is factors of 100 less than the tilt noise a horizontal LP would be subject to. Which is why I wish that more PSN people would build vertical long period instruments. Has there been any use of piezo electric accelerometers, either directly or with the output integrated to give velocity? (I am not talking about silicon chip devices.) What period would you recommend, please? I can extend the response out to ~15 sec without problems. Are there any other types of vertical seismometer that we can usefully construct, please? I was looking at your STM-8, but I can't get the spring and the whole project seems a bit too ambitious for me at the moment. Regards Chris _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>