obspy.io.sac.header¶
SAC header specification, including documentation.
Header names, order, types, and nulls, as well as allowed enumerated values, are specified here. Header name strings, and their array order are contained in separate float, int, and string tuples. Enumerated values, and their allowed string and integer values, are in dictionaries. Header value documentation is in a dictionary, for reuse throughout the package.
| Field Name | Type | Description |
|---|---|---|
| a = | F | First arrival time (seconds relative to reference time.) |
| az = | F | Event to station azimuth (degrees). |
| b = | F | Beginning value of the independent variable. |
| baz = | F | Station to event azimuth (degrees). |
| cmpaz = | F | Component azimuth (degrees, clockwise from north). |
| cmpinc = | F | Component incident angle (degrees, from vertical). |
| delta = | F | Increment between evenly spaced samples (nominal value). |
| depmax = | F | Maximum value of dependent variable. |
| depmen = | F | Mean value of dependent variable. |
| depmin = | F | Minimum value of dependent variable. |
| dist = | F | Station to event distance (km). |
| e = | F | Ending value of the independent variable. |
| evdp = | F | Event depth below surface (meters). |
| evel = | F | Event elevation (meters). |
| evla = | F | Event latitude (degrees north positive). |
| evlo = | F | Event longitude (degrees east positive). |
| f = | F | Fini/end of event time (seconds relative to reference time.) |
| gcarc = | F | Station to event great circle arc length (degrees). |
| idep = | I | Type of dependent variable:
|
| ievreg = | I | Event geographic region. |
| ievtyp = | I | Type of event:
|
| iftype = | I | Type of file:
|
| iinst = | I | Type of recording instrument. |
| imagsrc = | I | Source of magnitude information:
|
| imagtyp = | I | Magnitude type:
|
| iqual = | N | Quality of data, as integers. Enum values listed:
|
| istreg = | I | Station geographic region. |
| isynth = | I | Synthetic data flag:
|
| iztype = | I | Reference time equivalence:
|
| ka = | K | First arrival time identification. |
| kcmpnm = | K | Component name. |
| kevnm = | K | Event name. |
| kf = | F | Fini or end of event time identification. |
| khole = | k | Hole identification if nuclear event. |
| kinst = | K | Generic name of recording instrument |
| knetwk = | K | Name of seismic network. |
| ko = | K | Event origin time identification. |
| kstnm = | K | Station name. |
| kt0 = | F | User defined time pick identification. |
| kt1 = | F | User defined time pick identification. |
| kt2 = | F | User defined time pick identification. |
| kt3 = | F | User defined time pick identification. |
| kt4 = | F | User defined time pick identification. |
| kt5 = | F | User defined time pick identification. |
| kt6 = | F | User defined time pick identification. |
| kt7 = | F | User defined time pick identification. |
| kt8 = | F | User defined time pick identification. |
| kt9 = | F | User defined time pick identification. |
| kuser0 = | K | User defined variable storage area 0. |
| kuser1 = | K | User defined variable storage area 1. |
| kuser2 = | K | User defined variable storage area 2. |
| lcalda = | L | TRUE if DIST AZ BAZ and GCARC are to be calculated from st event coordinates. |
| leven = | L | TRUE if data is evenly spaced. |
| lovrok = | L | TRUE if it is okay to overwrite this file on disk. |
| lpspol = | L | TRUE if station components have a positive polarity (left-hand rule). |
| mag = | F | Event magnitude. |
| nevid = | N | Event ID (CSS 3.0) |
| norid = | N | Origin ID (CSS 3.0) |
| npts = | N | Number of points per data component. |
| nvhdr = | N | Header version number. Current value is the integer 6. Older version data (NVHDR < 6) are automatically updated when read into sac. |
| nwfid = | N | Waveform ID (CSS 3.0) |
| nzhour = | N | GMT hour. |
| nzjday = | N | GMT julian day. |
| nzmin = | N | GMT minute. |
| nzmsec = | N | GMT millisecond. |
| nzsec = | N | GMT second. |
| nzyear = | N | GMT year corresponding to reference time in file. |
| o = | F | Event origin time (seconds relative to reference time.) |
| odelta = | F | Observed increment if different from nominal value. |
| scale = | F | Multiplying scale factor for dependent variable |
| stdp = | F | Station depth below surface (meters). |
| stel = | F | Station elevation (meters). |
| stla = | F | Station latitude (degrees, north positive) |
| stlo = | F | Station longitude (degrees, east positive). |
| t0 = | F | User defined time (seconds picks or markers relative to reference time). |
| t1 = | F | User defined time (seconds picks or markers relative to reference time). |
| t2 = | F | User defined time (seconds picks or markers relative to reference time). |
| t3 = | F | User defined time (seconds picks or markers relative to reference time). |
| t4 = | F | User defined time (seconds picks or markers relative to reference time). |
| t5 = | F | User defined time (seconds picks or markers relative to reference time). |
| t6 = | F | User defined time (seconds picks or markers relative to reference time). |
| t7 = | F | User defined time (seconds picks or markers relative to reference time). |
| t8 = | F | User defined time (seconds picks or markers relative to reference time). |
| t9 = | F | User defined time (seconds picks or markers relative to reference time). |
| user0 = | F | User defined variable storage area 0. |
| user1 = | F | User defined variable storage area 1. |
| user2 = | F | User defined variable storage area 2. |
| user3 = | F | User defined variable storage area 3. |
| user4 = | F | User defined variable storage area 4. |
| user5 = | F | User defined variable storage area 5. |
| user6 = | F | User defined variable storage area 6. |
| user7 = | F | User defined variable storage area 7. |
| user8 = | F | User defined variable storage area 8. |
| user9 = | F | User defined variable storage area 9. |