Thread: Problem of Rotation with CMPAZ CMPINC

Started: 2018-05-31 02:31:38
Last activity: 2018-05-31 02:31:38
Topics: SAC Help
김 용우
2018-05-31 02:31:38
R,T My sac file is BHN, BHE. CMPINC=90 and CMPAZ=0 in BHN channel.CMPINC=90 and CMPAZ=90 in BHE channel. I know that CMPAZ and CMPINC is required for conducting Rotation, but My sac files not included information of CMPAZ and CMPINC. 1. Is it possible that rotate in sac without CMPAZ and CMPINC? 2. If not, how to obtain CMPAZ and CMPINC? ---------------------Yong-woo KIMEmail : suam5275<at>kangwon.ac.krgraduate studentDivision of Geology and GeophysicsKangwon National University1 Gangwondaehak-gil, Chuncheon-siGangwon-do, 24341 South Korea


  • Milton Plasencia
    2018-05-31 01:23:47
    Dear Yon,

    Answers:

    1) No, you need to define these variables in SAC header,

    2) do:
    sac> ch CMPINC 90
    sac> ch CMPAZ 90
    for E component,
    then
    sac> wh. # this command write the variables to header
    or
    sac> wo. # overwrite the sac file.

    similar procedure per N component.

    After check with command

    sac> lh. # list header

    here you can see the CMP** variables in header.

    HTH,

    Milton





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    On 30 May 2018 at 18:10, <"김 용우
    <suam5275<at>kangwon.ac.kr>"@iris.washington.edu> wrote:

    Dear sac experts, I have a problem with the rotation of N,E -> R,T



    My sac file is BHN, BHE.



    CMPINC=90 and CMPAZ=0 in BHN channel.

    CMPINC=90 and CMPAZ=90 in BHE channel.



    I know that CMPAZ and CMPINC is requi! red for conducting Rotation, but My
    sac files not included information of CMPAZ and CMPINC.



    1. Is it possible that rotate in sac without CMPAZ and CMPINC?



    2. If not, how to obtain CMPAZ and CMPINC?

    &nb! sp;



    ---------------------

    Yong-woo KIM

    Email : suam5275<at>kangwon.ac.kr

    graduate student

    Division of Geology and Geophysics

    Kangwon National University

    1 Gangwondaehak-gil, Chuncheon-si

    Gangwon-do, 24341



    South Korea






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