ZDF PROGRAM PACKAGE

Trace manipulation and plotting of seismograms and travel times windowed output

B.L.N. Kennett
Seismology Group, Research School of Earth Sciences,
Australian National University

Index:

ZDF format description

ZDF Program suite

1. Format conversion programs
2. Display
3. Analysis
4. Utilities
5. Stacking procedures
6. Software Access

Command files

The ZDF format uses Unix i/o routines and is thus accessible to both Fortran and C routines. The data is stored as real*4 values do that both 16-bit and 24 bit information can be handled.

The ZDF format specification and standard data structures are given in zdfhelp.
Routines are available for displaying seismograms and record sections with the option of superimposed travel time information and run-time filtering. Seismograms are plotted in a range and time window with user specified reduction slowness. In addition windowed travel time plots can be made, either separately or superimposed on the seismograms.

PROGRAMS

Format conversion programs   further details

• a) SAC - skipzdf
• multiple SAC files to a single ZDF file to facilitate record section plotting (skipzdf1 handles day crossing!)
• b1) CDF - cdfzdf
• single CDF file to a single ZDF file conversion of RSES 16-bit data format
• b2) CDF- wrazdf
• single CDF file to a single ZDF file conversion of WRA 16-bit data format (5 channel data)
• c) ZST - zstzdf
• single ZST file to a single ZDF file conversion of synthetic seismograms

Display etc   further details

• zdf_tsm/zdf_ysm
  Record section plotting with superimposed travel times using iasp software and run-time filtering also travel times from specified velocity model options for trace selection and depth corrections
• tsm: time on vertical axis, distance on horizontal axis
• ysm: time on horizontal axis distance on vertical axis
• zdf_dsm
  Seismogram display with optional superimposed travel times using iasp software also travel times from specified velocity model options for trace selection and depth corrections
• zdf_dwin
  Display of time windows around selected phases
• zdf_dtw
  Windows around the expected arrivals of P, PP, S and SS
• zdf_filt
  Offline band pass filtering of ZDF format records

Analysis routines   further details

• zdf_spec
  Display of trace and spectra for ZRT and P, SV, SH components scans a full ZDF file with a plotpage per station
• zdf_specrat
  Display of trace, spectra for P, SV, SH components and spectral ratios, slope. Scans a full ZDF file with a plotpage per station
• zdf_spr
  Calculation of spectra for P, SV, SH components and spectral ratios, slope. Scans a full ZDF file - no displays

ZDF Utilities  further details

• zdf_check/zdf_check2
  Rapid check of contents of ZDF file (.zb) more extensive output with zdf_check2
• zdf_mcheck
  Summary information for multiple ZDF files
• zdf_edit
  Editing of contents of ZDF files e.g. change of source information, with recalculation of distances etc
• zdf_chyp
  Introduction of EHB hypocentre parameters recalculation of distances etc rerotation of horizontal components
• zdf_chyp1
  Introduction of hypocentre parameters from a general source recalculation of distances etc rerotation of horizontal components
• zdf_samp
  Resampling (currently converts 20 samp/sec data to 25 samp/sec)

Index

Stacking of ZDF traces  further details

• zdf_stack    - trace stacking by distance bin
• zdf_phstack - slowness stacking
• zdf_p3stack - 3-component slowness stacking: phase based
• zdf_s3stack - 3-component slowness stacking: semblance based

The slowness stacking programs generate output in a stackfile format which depends on the particular procedure.
Conversion to zdf traces is achieved with the routines

• stkzdf - Single component slowness stacks
• sp3zdf - 3-component slowness stacks: phase based
• ss3zdf - 3-component slowness stacks: semblance based

Index

COMMAND FILES: