Thread: BH1 and BH2 rotations

Started: 2020-04-01 00:43:53
Last activity: 2020-04-01 00:43:53
Geo .
2020-04-01 00:43:53
Hi,
I just downloaded a seed volume from Wilber 3 and they contain data from
BH1 and BH2 channels. My understanding is that the reason for naming
channel components 1 and 2 as opposed to N and E, respectively, is because
their orientation is significantly different from N and E. I would like to
rotate 1 and 2 by some angle to N and E respectively and so, where do I
find this information (cmpinc?) in the seed volume I downloaded? It
contains mseed files as well as dataless files including xml files.

Many thanks!

Januka

  • Adam Clark
    2020-03-31 09:51:09
    Hi Januka,

    The dataless or StationXML files should have azimuth and dip values for calculating the exact orientations, most tools that can do the relevant rotations should know how to read the relevant information from these.

    The general practice is as you say (N and E if they are aligned, 1 and 2 otherwise) but there are no hard rules for channel naming; it's really up to the operator.
    You can find more at: http://ds.iris.edu/ds/nodes/dmc/data/formats/seed-channel-naming/

    Cheers,
    Adam


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

    Adam Clark
    Web developer / admin
    IRIS Data Management Center
    adam<at>iris.washington.edu

    ----- Original Message -----
    From: "Geo . (via IRIS)" <data-processing-help<at>lists.ds.iris.edu>
    To: "Data Processing Help" <data-processing-help<at>lists.ds.iris.edu>
    Sent: Tuesday, March 31, 2020 9:13:10 AM
    Subject: [IRIS][data-processing-help] BH1 and BH2 rotations

    Hi,
    I just downloaded a seed volume from Wilber 3 and they contain data from BH1 and BH2 channels. My understanding is that the reason for naming channel components 1 and 2 as opposed to N and E, respectively, is because their orientation is significantly different from N and E. I would like to rotate 1 and 2 by some angle to N and E respectively and so, where do I find this information (cmpinc?) in the seed volume I downloaded? It contains mseed files as well as dataless files including xml files.

    Many thanks!

    Januka


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