All, =20 Please pardon me if this winds up a double posting =96 I'm still trying = to get e-mail addresses straightened out. =20 In the normal course of my work I've occasionally run across the problem = of vibration sensors being pushed beyond their physical limits =96 i.e; the suspended mass hits the end stops. For the most part, this has never = been a significant problem for me because there's always been another way to = get the data. However, when I downloaded seismic waveforms for the Dec 26th = EQ from Wooster, Ohio and Ann Arbor, Mi I found that their data had been compromised. It appears that the seismometers hit their stops and badly affected about 2-hours of the recordings. I believe this is the case at several of the stations but certainly not all of them. I found many = intact waveforms on the PSN server. =20 I've searched through my personal references as well as exercising = Google; but to no avail. So, I turn to the vast expertise of PSN. Are any of you aware of a numerical process by which such signals can be reliably = "fixed"? I'm sure that a neural network could be trained to approximate the true signal. But I'm more interested in a dynamic model consisting of a mass-spring-dashpot model of the seismometer and a spring-dashpot model = for the stops at the end of travel. =20 Regards, -Tim- =20 Timothy Carpenter, P.E., Pres., GeoDynamics Consultants, Inc. 5043 Whitlow Ct. Commerce Twp., Mi 48382 248-363-4529 (voice & fax) 248-766-1629 (cell) geodynamics@........... (primary) geodynamics@....... (secondary) =20 =20All,
Please pardon me if this winds up a double posting = – I'm still trying to get e-mail addresses straightened out.
In the normal course of my work I've occasionally run = across the problem of vibration sensors being pushed beyond their physical = limits – i.e; the suspended mass hits the end stops. For the most part, = this has never been a significant problem for me because there's always been = another way to get the data. However, when I downloaded seismic waveforms for the = Dec 26th EQ from Wooster, Ohio and Ann = Arbor, Mi I found that their data had been compromised. It appears that the seismometers = hit their stops and badly affected about 2-hours of the recordings. I = believe this is the case at several of the stations but certainly not all of them. I = found many intact waveforms on the PSN server.
I've searched through my personal references as well = as exercising Google; but to no avail. So, I turn to the vast expertise of = PSN. Are any of you aware of a numerical process by which such signals can be reliably "fixed"? I'm sure that a neural network could be = trained to approximate the true signal. But I'm more interested in a dynamic model consisting of a mass-spring-dashpot model of the seismometer and a spring-dashpot model for the stops at the end of = travel.
Regards,
-Tim-
Timothy Carpenter, P.E., Pres.,
GeoDynamics Consultants, Inc.
5043 Whitlow Ct.
Commerce Twp., Mi 48382
248-363-4529 (voice & fax)
248-766-1629 (cell)
geodynamics@........... = (primary)
geodynamics@....... = (secondary)