jmhannon@.................... wrote: > > > Please share your opinions on the Analog Devices > > accellerometers. Are these good enough to provide > > useful srong motion data in large arrays? Or are > > they really only suited to emergency switching? > > Back in my youth, there was a maximum theoretical acceleration from an earthquake of a fraction of a g. Then the Piocama (sp?) Dam earthquake recorded 1.01 g on bedrock. This was a good sized earthquake, but not big enough to inspire memories like the 1972 or Loma Prieta earthquakes. I would think that sitting up on the fault you could get some stuff well within the range of sensitivity of that accelerometer. You'll have to wait a while, but your geophones are going to be useless when it happens and you'll feel bad if you don't get a decent recording of your own personal event. Regarding that fish tank, it's going to have serious problems. Down here in Saratoga (10 miles North) we had waves over 6 feet in my swimming pool and lost about two feet of water from the last Loma Prieta earthquake. I'm not sure of the solution, maybe suspend it from rubber bands from the ceiling and put on a cover. Don't forget that most strong-motion seismographs fail because the batteries are dead, you will not have any power when it hits, so maybe one of those computer power supplies is in order. -- Doug Crice web site http://www.georadar.com GeoRadar Inc. e-mail dcrice@............ 19623 Via Escuela Drive phone 408-867-3792 Saratoga, CA 95070 USA fax 408-867-4900 _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>