Version 2 (modified by MarcusWalther, 14 years ago) (diff) |
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# Format of the output parameter files (evt-Files)

The evt-file contains all available phase picks and analysis parameters of th SHM program. It is a plain text file and is pretty good self-explaining. It has one information per line with the general format

<descriptive text>: <value>

## Used available parameters

- Station code
- name of the station where a phase pick was made. Taken from trace when phase pick is done. Possible values: text string of maximum length 10.

- Onset time
- time of phase pick. Taken from trace where phase pick is done. Possible values: absolute time in SH time format

- Onset type
- type of phase onset. Taken from phase dialog box. Possible values: keywords 'emergent', 'impulsive'.

- Phase name
- name of picked phase. Taken from phase dialog box. Possible values: text string of maximum length 20.

- Sign
- sign of first onset of specified phase. Taken from phase dialog box. Possible values: keywords 'positive', 'negative'.

- Component
- component where phase was picked. Taken from trace where phase pick is done. Possible values: single character.

- Period (sec)
- dominant period of phase in s. Measured via amplitude/period menu entries (e.g. Ampl & Period auto Peak?). Possible values: floating point number.

- Amplitude (nm)
- estimated displacement amplitude of measured signal in nm. The determined signal amplitude is divided by the amplitude transfer function of the recording equipment at the signal period. Measured via amplitude/period menu entries. Possible values: floating point number.

- Amplitude Time (sec)
- time (s) relative to phase pick where amplitude was measured. Determined via amplitude/period menu entries. Possible values: floating point number.

- Vel. Amplitude (nm/sec)
- estimated velocity amplitude of measured signal in nm/s. The determined signal amplitude is divided by the amplitude transfer function of the recording equipment at the signal period. Measured via amplitude/period menu entries. Possible values: floating point number.

- BB amplitude (nm/sec)
- broadband amplitude in nm/s measured on unfiltered broadband records. Measured via amplitude/period menu entries. Possible values: floating point number.

- BB period (sec)
- signal period in s. Measured via amplitude/period menu entries on unfiltered broadband records. Possible values: floating point number.

- Beam-Slowness (sec/deg)
- slowness of phase in s/deg (modulus of horizontal slowness vector) measured using array algorithms (Plane Wave?, FK?). Possible values: floating point number.

- Beam-Azimuth (deg)
- azimuth of phase in deg (complementary to Beam-Slowness) measured using array algorithms. Possible values: floating point number.

- Epi-Slowness (sec/deg)
- corrected slowness in s/deg (modulus of horizontal slowness vector) of phase computed via Calibration? menu entry. Used on P phases for location purposes. Possible values: floating point number.

- Epi-Azimuth (deg)
- corrected azimuth of phase in deg (complementary to Epi-Slowness). Possible values: floating point number.

- Distance (deg)
- epicentral distance in deg. Computed in location programs. Possible values: floating point number.

- Distance (km)
- epicentral distance in km. Computed in location programs. Possible values: floating point number.

- Quality number
- phase quality number between 1 (=bad) and 9 (=good). Taken from phase dialog box. Possible values: integer numbers 1 to 9.

- Magnitude ms
- magnitude ms computed via magnitude menu entries. Possible values: floating point number.

- Magnitude mb
- magnitude mb computed via magnitude menu entries. Possible values: floating point number.

- Magnitude ml
- magnitude ml computed via magnitude menu entries. Possible values: floating point number.

- Magnitude mw
- magnitude mw. Possible values floating point number.

- Broadband Magnitude
- broadband magnitude computed via magnitude menu entries. Possible value: floating point number.

- User Magnitude
- user defined magnitude value. Not used by SHM. Possible values: floating point number.

- User Magn. Description
- Description text to above user magnitude. Possible values: text string of maximum length 40.

- Source Region
- name of epicentral region. Usually computed in location programs. Possible values: text string of maximum length 80.

- Comment
- arbitrary text to comment an event. Possible values: text string of arbitrary length.

- Latitude
- epicentre latitude in deg. Computed in location programs. Possible values: floating point number.

- Longitude
- epicentre longitude in deg. Computed in location programs. Possible values: floating point number.

- Location method
- which algorithm used to get location. Set by location program. Possible values: keywords 'array beam (calibrated)', 'array beam (uncorrected)', 'array beam (resid. corr.)', 'hypoellipse', 'locsat', 'hypocenter', 'hypo71', 'hyposat', 'relative travel times', 'external'.

- Location quality
- describes quality of location. Taken from parameter box. Possible values: keywords 'too weak', 'incoherent', 'no bearing', 'region', 'reliable'.

- Velocity model
- velocity model used for location of epicentre. Possible values: text string of maximum length 40.

- Location Input Params
- additional input parameters for external location programs. Possible values: text string of maximum length 80.

- Applied filter
- filter applied to trace when phase pick was done. Possible values: text string of maximum length 80.

- Depth (km)
- source depth in km. Computed in location programs or set by user. Possible values: floating point number.

- Depth type
- type of depth given. Possible values: keywords '(n) preset', '(g) estimated', '( ) free', '(?) poorly constrained', '(*) less well constrained', '(d) reliable'.

- Origin time
- origin time of event. Computed by location programs. Possible values: absolute in SH time format.

- Event ID
- unique event ID assigned automatically by SHM in menu entry Final Parameters?. Possible values: integer number.

- Weight
- phase weight derived from phase quality number. Meanwhile obsolete. Possible values: integer numbers 1 to 4.

- Reference Latitude
- latitude in deg of reference point (used in array location method). Possible values: floating point number.

- Reference Longitude
- longitude in deg of reference point (used in array location method). Possible values: floating point number.

- Reference Location Name
- name of reference location (reference station name). Possible values: text string of maximum length 10.

- Analyst
- initials of analyst. Prompted at startup of SHM if requested. Possible values: text string of maximum length 10.

- No. of Stations used
- number of stations used in location. Set in location programs. Possible values: integer number.

- Region Table
- name of region table used. Possible values: keywords 'Flinn-Engdahl', 'GEO_REG', 'SEIS_REG'.

- Region ID
- ID number of source region. Computed in location programs. Possible values: integer number.

- Event Type
- type of event analysed. Taken from phase dialog box. Possible values: keywords 'teleseismic quake', 'nuclear explosion', 'regional quake', 'local quake', 'quarry blast', 'mining event'.

- Source of Information
- agency reporting the event, taken from menu entry Info Source?. Possible values: text string of maximum length 10.

- Ampl&Period Source
- where the amplitude measurement was done. Possible values: keywords 'direct', 'beam trace', 'align trace'.

- Onset Window Left
- time resolution of onset pick. SHM allows the specification of onset time errors. This specifies the left inaccuracy time window in s relative to pick. Possible values: floating point number.

- Onset Window Right
- time resolution of onset pick. SHM allows the specification of onset time errors. This specifies the right inaccuracy time window in s relative to pick. Possible values: floating point number.

- Error in Latitude (km)
- location error in km in latitude direction. Computed by the location program. Possible values floating point number.

- Error in Longitude (km)
- location error in km in longitude direction. Computed by the location program. Possible values floating point number.

- Error in Depth (km)
- depth error in km. Computed by the location program. Possible values: floating point number.

- Error in Origin Time
- origin time error ins. Computed by location program. Possible values: floating point number.

- Error Ellipse Major
- error ellipsis major axis in km. Computed by the location program. Possible values: floating point number.

- Error Ellipse Minor
- error ellipsis minor axis in km. Computed by the location program. Possible values: floating point number.

- Error Ellipse Strike
- strike angle of error ellipsis in deg. Computed by location program. Possible values: floating point number.

- Max Azimuthal Gap (deg)
- maximum azimuthal gap in observing stations. Possible values: floating point number.

- RMS of Residuals (sec)
- root mean square of time residuals quantifying the location fit. Possible values: floating point number.

- Phase Flags
- flags set on phase. Possible values: text string of maximum length 6.

- Signal/Noise?
- signal to noise ratio, determined with S/N menu entries. Possible values: floating point number.

- Residual Time
- residual time of phase in s. Computed by location programs. Possible values: floating point number.

- Residual Correction
- empirical corrections to residual times (experimental). Possible values: floating point number.

- Pick Type
- type of phase pick. Possible values: keywords 'manual', 'automatic', 'theoretical'.

## Unused parameters

LP component::

not used. Possible values: single character.

LP period (sec)::

not used. Possible values: floating point number.

LP amplitude::

not used. Possible values: floating point number.

- Onset Accuracy
- not used. Possible values: keywords 'seconds', 'milliseconds'.

- Corner Frequency
- not used. Possible values: floating point number.

- Low Frequency Level
- not used. Possible values: floating point number.

- Moment Tensor Elements
- not used. Possible values: text string of maximum length 80.

- Moment Tensor Descr.
- not used. Possible values: text string of maximum length 80.

- Scalar Moment
- not used. Possible values: floating point number.

- Fault Plane Solution
- not used. Possible values: text string of maximum length 80.

- FPS Description
- not used. Possible values: text string of maximum length 80.

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