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dttrugman / GrowClust3D.jl

Julia-based implementation of GrowClust relative earthquake relocation.
GNU General Public License v3.0
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NLL velocity grid origin not aligned with seismicity #2

Closed oliviamark closed 2 years ago

oliviamark commented 2 years ago

Hi there,

I'm trying to use GrowClust3D on some earthquakes in the central North Island of New Zealand. We're using 3D velocity grids generated from the nationwide velocity model: https://zenodo.org/record/3779523#.YyKjJuxBy3I

We're getting the following error: PROJECTION ORIGIN NOT ALIGNED WITH SEISMICITY

The origin for the projection is -41.7638 172.9037 140.0 this lies outside our region of earthquakes which have the following distribution:

Median event location: 175.79825 -38.3992 Longitude Percentiles (1%, 99%): 174.938195 176.44939 Latitude Percentiles (1%, 99%): -39.010295 -37.952020000000005

We're using the following projection in the GrowClust parameter file: tmerc GRS80 -41.7638 172.9037 140.0

Is this location check necessary? How would you recommend proceeding?

Cheers

dttrugman commented 2 years ago

Good question, thanks! This check was put in more to prevent users from accidentally placing their projection region well away from the seismicity. In your case, I think you should be ok.

I have updated the codes on GitHub (replacing "ERROR" with "Caution"; you can grab the latest or just comment out the "exit()" commands near those warning lines.