# 3 component back-azimuth computation algorithm?

**URL:** https://discourse.obspy.org/t/3-component-back-azimuth-computation-algorithm/267
**Category:** Users Mailing List Archive
**Tags:** archive
**Created:** [February 9, 2014, 1:38pm UTC](https://discourse.obspy.org/t/3-component-back-azimuth-computation-algorithm/267 "2014-02-09T13:38:37Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![seismopaul](https://discourse.obspy.org/letter_avatar_proxy/v4/letter/s/ad7895/32.png) [@seismopaul](https://discourse.obspy.org/u/seismopaul)
#### Post date: [February 9, 2014, 1:38pm UTC](https://discourse.obspy.org/t/3-component-back-azimuth-computation-algorithm/267/1 "2014-02-09T13:38:37Z")

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Hi ObsPy'ers,

Has anyone out there implemented the 3 component back-azimuth analysis algorithm in python from this paper below (and be willing to share it?)? If not, I plan on implementing it but hate re-inventing wheels.

Geophysical Journal (1989) 97,471-480  
Real-time event detection,phase identification and source location estimation using single station three-component seismic data  
R.G.Roberts, A. Christoffersson, and F. Cassidy

Thanks.

Cheers,

Paul

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### Author: ![Joachim\_Wassermann1](https://discourse.obspy.org/letter_avatar_proxy/v4/letter/j/90db22/32.png) [@Joachim\_Wassermann1](https://discourse.obspy.org/u/Joachim_Wassermann1)
#### Post date: [February 10, 2014, 8:27am UTC](https://discourse.obspy.org/t/3-component-back-azimuth-computation-algorithm/267/2 "2014-02-10T08:27:01Z")

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Hi Paul,

would be cool - I was thinking for a long time already to implement this  
method myself - but never succeeded!  
I have a bunch of methods ready to be included into obspy master  
(Flinn/Montalbetti, Vidale), whatsoever the Roberts et al. would be very  
valuable.

Cheers Joachim