Locating earthquakes#
Once the travel times tables are created we are ready to locate earthquakes. To do this we start first with analyst picked body wave arrivals archived in the Pacific Northwest Seismic Network catalog.
Nonlinloc#
To obtain absolute earthquake locations, we utilize the nonlinloc software. NonLinLoc: Lomax et al. [2000], Lomax et al. [2009]
In order to run NonLinLoc, you must have a precalculated the timetravel tables. To do so, refer to the section velocity model, more precisely gridding cascadia. You will also need the pick files, formated properly.
In this section there are 4 different notebooks:
Format the picks for NonLinLoc 1_format_picks_nll
Prepare the config file to run NonLinLoc 2_config_file_nll
Use subprocess to run NonLinLoc 3_run_location
Verify results: simple comparison between the new locations and the PNSN catalog 4_compare_location_PNSN