Waveform Data

File Structure

The waveform data is stored in the fwat_data/ directory. The waveform data is organized by event, and each event has its own subdirectory fwat_data/${event_name}/. The waveform data files are in SAC format, and the file name should be in the format of

• net.sta.BX?.sac: in teleseismic and ambient noise tomography;
• net.sta.BXR.F${gaus}.rf.sac: in receiver function adjoint tomography;

where net is the network code, sta is the station code, and BX? is the component code (e.g., BXR for radial component, BXZ for vertical component), which are set in the DATA/fwat_prams.yml: RCOMPS. The gaus is the Gaussian width of the receiver function in 1 bit float format (e.g., 0.5, 1.0, and 2.0), which should be the same as in DATA/fwat_params.yml: F0.

SAC Headers

Some SAC headers are required to be set in the waveform data files. The following headers are required:

For All Simulation Types

• b: Beginning time of the waveform data in seconds.
• baz: Back-azimuth of the event in degrees.
• dist: Epicentral distance in kilometers.

Additional Headers for Teleseismic Tomography

• t0: The arrival time of the first P wave in seconds.