hi

the capabilities of Baseline corrections seismosignall , remove mean entire from analog records and remove mean pre-event from entire records Or Before input data to Seismosignal , Analysis Remove mean data ?!

hi

the capabilities of Baseline corrections seismosignall , remove mean entire from analog records and remove mean pre-event from entire records Or Before input data to Seismosignal , Analysis Remove mean data ?!

the capabilities of Baseline corrections seismosignall , remove mean entire from analog records and remove mean pre-event from entire records Or Before input data to Seismosignal , Analysis Remove mean data ?!

- Ms_Eng offline
**Posts:**5**Joined:**23 Apr 2017, 05:51

MS_Eng,

The post is not very clear. Can you please rephrase the questions in a more clear way?

In any case, there is a good description of the capabilities of SeismoSignal in baseline correction in the help system of the program.

Seismosoft Support

The post is not very clear. Can you please rephrase the questions in a more clear way?

In any case, there is a good description of the capabilities of SeismoSignal in baseline correction in the help system of the program.

Seismosoft Support

- seismosoft offline

**Posts:**459**Joined:**06 Jul 2007, 04:55

Hi

In the process of correcting the baseline, subtract the average from data acceleration (zeroth-Order)??

For Analog instruments : mean data subtract entire data

For Digitall Instruments : mean pre-event data subtract entire data

In the process of correcting the baseline, subtract the average from data acceleration (zeroth-Order)??

For Analog instruments : mean data subtract entire data

For Digitall Instruments : mean pre-event data subtract entire data

- Ms_Eng offline
**Posts:**5**Joined:**23 Apr 2017, 05:51

Hi Ms_Eng,

I quote from the program help:

"Baseline Correction, as implemented in SeismoSignal, consists in (i) determining, through regression analysis (least-squares-fit method), the polynomial curve that best fits the time-acceleration pairs of values and then (ii) subtracting from the actual acceleration values their corresponding counterparts as obtained with the regression-derived equation. In this manner, spurious baseline trends, usually well noticeable in the displacement time-history obtained from double time-integration of uncorrected acceleration records, are removed from the input motion.

Polynomials of up to the 3rd degree can be employed, effectively meaning that constant (y=a0), linear (y=a0+a1*x), quadratic (y=a0+a1*x+a2*x^2) and cubic (y=a0+a1*x+a2*x^2+a3*x^3) baseline correction can be used. The user has the ability to decide if this operation is to be carried out or not (by default, it is not) and can also choose which polynomial degree to adopt (default is 'linear'). The values of the polynomial coefficients are indicated to the user, for his/her information. Further information and discussion on baseline correction can be found in the work by Boore [2001], amongst others."

Hope that things are clear.

Seismosoft Support

I quote from the program help:

"Baseline Correction, as implemented in SeismoSignal, consists in (i) determining, through regression analysis (least-squares-fit method), the polynomial curve that best fits the time-acceleration pairs of values and then (ii) subtracting from the actual acceleration values their corresponding counterparts as obtained with the regression-derived equation. In this manner, spurious baseline trends, usually well noticeable in the displacement time-history obtained from double time-integration of uncorrected acceleration records, are removed from the input motion.

Polynomials of up to the 3rd degree can be employed, effectively meaning that constant (y=a0), linear (y=a0+a1*x), quadratic (y=a0+a1*x+a2*x^2) and cubic (y=a0+a1*x+a2*x^2+a3*x^3) baseline correction can be used. The user has the ability to decide if this operation is to be carried out or not (by default, it is not) and can also choose which polynomial degree to adopt (default is 'linear'). The values of the polynomial coefficients are indicated to the user, for his/her information. Further information and discussion on baseline correction can be found in the work by Boore [2001], amongst others."

Hope that things are clear.

Seismosoft Support

- seismosoft offline

**Posts:**459**Joined:**06 Jul 2007, 04:55

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