How to export a file "focal_mech_stress.csv" in Coulomb 3

After I import the existing input file, I click overlays-->earthquakes to import earthquake data. However, the format data required by the [focal_mech_calc.m] file was not found in the case earthquake data-->[% 1) lon, 2) lat, 3) year, 4) month, 5) day, 6) m, 7) depth, 8) hr, 9) min, 10) strike1, 11) DIP1, 12) rake1, 13) strike2, 14) dip2, 15) rake2, 16) x position, 17) y position]. When I import the earthquake data in the earthquake_data file, after running funtions-->Calc stress on faults, only the [element_conditions.csv] file is generated, and [focal_mech_stress.csv] is not generated. What is the reason?

When I write earthquake data in the file format of [focal_mech_calc.m], when I click overlays-->earthquakes, I cannot import it successfully. What is the reason?

Can anyone answer this question? Thank you very much

Answer 1

[Riya]

It seems like you are trying to work with earthquake data in Coulomb 3, a software package used for modeling stress changes in the Earth's crust due to faulting and earthquakes. You're encountering issues exporting the "focal_mech_stress.csv" file and importing earthquake data in the correct format for the focal_mech_calc.m MATLAB function.

Here are a few steps you can take to troubleshoot and resolve the issue:

The issue with the "focal_mech_stress.csv" file not being generated in Coulomb 3 could be due to several reasons:

• The earthquake data you're trying to import may not be in the correct format required by the `focal_mech_calc.m` script. Ensure that the data strictly follows the structure Coulomb 3 expects.
• Coulomb 3 might not support the direct generation of "focal_mech_stress.csv" based on the imported data. This functionality might need to be performed manually or with an external script.
• If you cannot import the earthquake data after formatting it for `focal_mech_calc.m`, the file might have formatting issues that Coulomb 3 cannot parse, such as incorrect delimiters or missing headers.

To resolve the issue:

• Consult the Coulomb 3 documentation Chapter 9 for structure of input file and numerical view output file for map view, cross section, etc on importing earthquake data and generating the desired output files.

For more information you can refer following documentation for more information about Coulomb input and output structure:

https://www.usgs.gov/node/279387

pubs.usgs.gov/of/2011/1060/of2011-1060.pdf