twleiper@........ wrote: >So here is the challenge question: >Assuming identical detector,gain and filtration (they are) and only the >difference in period, can you calculate the capacity of the oil truck? >(ST, Give everybody else a day before posting the correct answer, >please...) Doug Crice wrote: "...whether the drift is caused by mutual gravitational attraction between the oil truck and seismometer..." And just for fun, another idle thought, what about the distortion to the Earth's magnetic field due to the large diamagnetic body (the oil) in the vicinity. Just as a helpful hint, I have estimated that fuel oil might be cycloheptane (C7H14) (see also: http://www.bowdoin.edu/dept/es/200/guide/oil.html and search for cycloalkanes). Based on that, the Chemistry Physics handbook says the diamagnetic suseptibility is minus 73.9 e-6 for cycloheptane. Also I think the the problem statement is incomplete. Don't I need to know the bedrock composition so I can estimate the strain coefficient? I must have too much time on my hands. Regards, Charles R. Patton _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>