Thread: time tag question

Started: 2014-05-15 20:23:09
Last activity: 2014-05-15 20:23:09
Topics: SAC Help
reza
time tag question
2014-05-15 20:23:09
Hello


I need to divide each sample to the respective lapse time. For instance I
need to evaluate log10(A/T). For example :

mtw t0 -2 30
div time
log10

but the problem is that I could not find "time" variable or blackboard
which refers to each sample time.

Thank you,

Reza

  • Milton Plasencia
    Re: time tag question
    2014-05-15 18:10:02
    Hi Reza,

    To calculate log(A/T), you must have the amplitude of ground motion (displacement)
    in microns and T= period of wave in seconds where you take the amplitude value,
    for long period it is between 18-22 sec and for short period between 0.8 and 1.2 seconds.

    HTH,

    Milton P. Plasencia Linares
    mpplasencia<at>gmail.com



    On May 15, 2014, at 10:53 AM, Reza Rezaei <re.rezaei<at>gmail.com> wrote:

    Hello


    I need to divide each sample to the respective lapse time. For instance I need to evaluate log10(A/T). For example :

    mtw t0 -2 30
    div time
    log10

    but the problem is that I could not find "time" variable or blackboard which refers to each sample time.

    Thank you,

    Reza
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