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I want to calculate the azimuth of a compressional wave-front by plotting amplitude of two horizontal components (hodogram) within a time window. With the use of particle motion tool available Geopsy I can plot amplitude of two horizontal components. But I need to fit a trendline to know the azimuth of the wave-front. This option seems to be not available in Geopsy. Could you please let me know how I can be able to fit a trendline in particle motion plot?

Currently there is no way to directly calculate a regression for the the particle motion plugin. However, it's a nice suggestion that might be helpful. What is your preferred method to achieve that? Compute all azimuths and sum them to extract the average one? Or do you have something else in mind?

There are various options to achieve this computation:

1. export the results under a .layer file, untar it (see XML files), binary files bin_data_* contain all points of the figure.
2. export your component as Multi-column ASCII files. For each sample, you have the couples (X, Y), compute the regression you want with any external tool (Matlab, OpenOffice, Gnumeric or even Excel).
3. wait for the implementation in the main Geopsy release (could be a little too long)

Hello,

Thank you for your reply.

Firstly, I want to let you know that the link you have given (See XML files) is not complete. It ended abruptly with this text "To convert it to ASCII (): " .

Anyway, I have managed to save a .layer file and then convert the binary data to ascii. But I could not be able to understand that ascii file which contains some numbers which does not seem to be even right number for X,Y. Can you please help me to understand what thses ascii values stand for?

By any chance, is there option to extract e worksheet from particle motion plugin?

Thanks for reporting the incomplete documentation. I'm currently working on finishing this topic. It will be released in a few minutes.

Regarding your question, rather than computing the particle motion, it will be more straight forward if you follow the second option. With the text export, you will get directly a file readable in a worksheet.

About the process, can you confirm my assumptions? Or are doing something else?