Instrument response misfit

Usage Questions
1

question

Hi!

I removed the response using ‘VEL’ as an output, and then integrated; and then I compared it with removing the response using ‘DISP’ as an output. I would expect both removed response time series will be the same, but I am getting some difference. Do you know which one represents truly ground motion?
Here is my code:

st=read()
tr=st[0]
tr0=tr.copy()
tr.remove_response(output=‘VEL’, water_level=None)
tr.integrate()
tr.detrend(‘demean’)
tr.detrend(‘linear’)

tr0.remove_response(output=‘DISP’,water_level=None)

Thanks in advance!

2

Seems like it’s pretty similar, just with slightly different demeaning? Also, it seems you do not use any means to stabilize the instrument correction since you opted out of water level and use no pre filt. Looks like you have low frequency noise blown up.