The program :mod:`~orientpy` is meant to be run using command-line scripts that are described below. These can be used in bash scripts to automate data processing. These scripts use classes defined in :mod:`~orientpy` to process single-station and single-event seismograms, which are then aggregated to generate a single estimate of station orientation per method. There are three methods with accompanying scripts that can be used to determine station orientation, which are described below. All of them use a station database provided as a :class:`~stdb.StDb` dictionary.
Downloads three-component seismograms based on a catalogue of earthquakes and performs automated estimation of P-wave polarization. Station selection is specified by a network and station code. The database is provided as a :class:`~stdb.StDb` dictionary. This method can be used with teleseismic P-wave data or regional earthquake data, by specifying the appropriate options accordingly. Each usable station-event seismograms are used to calculate an estimate of station orientation. For each estimate, a number of quality-control parameters are calculated to help in the aggregation to produce a final estimate of station orientation.
This automated method will use the same processing parameters for all waveforms (e.g., time window around predicted P-wave arrival, bandpass frequencies, etc.). Because the properties of individual seismograms can vary widely for different earthquakes, a different script can be used in manual (interactive) mode to improve the quality of the estimates (see below).
$ bng_calc_auto -h
usage: bng_calc_auto [arguments] <Station Database>
Program to compute the orientation of the components of a station based on
those in a station database.
positional arguments:
indb Station Database to process from.
optional arguments:
-h, --help show this help message and exit
-v VERB, --verbose VERB
Enable Level of verbose output during processing. (0)
No Output; (1) Output Event Analysis counter; (2)
Counter and results. Default 2
-O, --overwrite Overwrite existing data on disk. [Default False]
--save-location SAVELOC
Specify Save destination. Default is BNG_RESULTS (and
sub-directories based on Station Name).
--no-save-progress Do not save progress during processing.
Local Data Settings:
Settings associated with defining and using a local data base of pre-
downloaded day-long SAC files.
--local-data LOCALDATA
Specify a comma separated list of paths containing
day-long sac files of data already downloaded. If data
exists for a seismogram is already present on disk, it
is selected preferentially over downloading the data
using the Client interface
--no-data-zero Specify to force missing data to be set as zero,
rather than default behaviour. [Default sets to nan]
--no-local-net Specify to prevent using the Network code in the
search for local data (sometimes for CN stations the
dictionary name for a station may disagree with that
in the filename. [Default Network used]
Server Settings:
Settings associated with which datacenter to log into.
--server-cat SERVER_CAT
Catalogue server setting: Key string for recognized
server that provide `available_event_catalogs` service
(one of 'AUSPASS', 'BGR', 'EARTHSCOPE', 'EIDA',
'EMSC', 'ETH', 'GEOFON', 'GEONET', 'GFZ', 'ICGC',
'IESDMC', 'INGV', 'IPGP', 'IRIS', 'IRISPH5', 'ISC',
'KNMI', 'KOERI', 'LMU', 'NCEDC', 'NIEP', 'NOA',
'NRCAN', 'ODC', 'ORFEUS', 'RASPISHAKE', 'RESIF',
'RESIFPH5', 'SCEDC', 'TEXNET', 'UIB-NORSAR', 'USGS',
'USP'). [Default 'IRIS']
--server-wf SERVER_WF
Waveform server setting: Base URL of FDSN web service
compatible server (e.g. “http://service.iris.edu”) or
key string for recognized server (one of 'AUSPASS',
'BGR', 'EARTHSCOPE', 'EIDA', 'EMSC', 'ETH', 'GEOFON',
'GEONET', 'GFZ', 'ICGC', 'IESDMC', 'INGV', 'IPGP',
'IRIS', 'IRISPH5', 'ISC', 'KNMI', 'KOERI', 'LMU',
'NCEDC', 'NIEP', 'NOA', 'NRCAN', 'ODC', 'ORFEUS',
'RASPISHAKE', 'RESIF', 'RESIFPH5', 'SCEDC', 'TEXNET',
'UIB-NORSAR', 'USGS', 'USP'). [Default 'IRIS']
--user-auth USERAUTH Authentification Username and Password for the
waveform server (--user-auth='username:authpassword')
to access and download restricted data. [Default no
user and password]
--eida-token TOKENFILE
Token for EIDA authentication mechanism, see
http://geofon.gfz-
potsdam.de/waveform/archive/auth/index.php. If a token
is provided, argument --user-auth will be ignored.
This mechanism is only available on select EIDA nodes.
The token can be provided in form of the PGP message
as a string, or the filename of a local file with the
PGP message in it. [Default None]
Station Selection Parameters:
Parameters to select a specific station.
--keys STKEYS Specify list of Station Keys in the database to
process.
--zcomp ZCOMP Specify the Vertical Component Channel Identifier.
[Default Z].
-c NAMECONV, --coord-system NAMECONV
Coordinate system specification of instrument. (0)
Attempt Autodetect between 1 and 2; (1) HZ, HN, HE;
(2) Left Handed: HZ, H2 90 CW H1; (3) Right Handed:
HZ, H2 90 CCW H1. [Default 2]
Timing Parameters:
Parameters associated with event timing and window length.
--start STARTT Enter Start date for event catalogue search. Note,
more recent of this value or station start date will
be used.
--end ENDT Enter End date for event catalogue search. Note, less
recent of this or the station end date will be used.
--window WLEN Enter length of time window following P arrival time
in seconds. [Default 15.]
--times TT Enter window start and end times relative to predicted
P arrival time in seconds. Negative values imply start
of window before P wave arrival. [Default -2., 5.]
Earthquake Selection Criteria:
Parameters associated with selecing the subset of earthquakes to use in
calculations.
--min-mag MINMAG Specify the minimum magnitude of Earthquakes to use in
the catalogue search. [Default 5.5]
--max-mag MAXMAG Specify the maximum magnitude of Earthquakes to use in
the catalogue search. [Default 9.]
--min-dist MINDIST Specify the minimum earthquake distance (in degrees).
[Default 5.]
--max-dist MAXDIST Specify the maximum earthquake distance (in degrees).
[Default 175.]
--max-dep MAXDEP Specify maximum Earthquake Depth (km). [Default no
limit]
Processing Parameters:
Parameters associated with BNG processing.
--new-sampling-rate NEW_SR
Specify new sampling rate in Hz. [Default no
resampling]
--dphi DPHI Specify angle interval for search, in degrees.
[Default 0.1]
--bp BP Specify corner frequencies in Hz as a list of two
floats. [Default 0.7,5.0]
--plot Show processing step including raw and rotated
waveforms. [Default doesn't show plot]
Collects the estimated azimuths previously calculated and calculates the mean value after some quality control thresholding based on the rotated waveforms. The error is obtained from a bootstrap analysis of robust estimates.
$ bng_average -h
usage: bng_average [arguments] <Station Database>
Program to average the orientations of the seismometer in a station database.
positional arguments:
indb Station Database to process from.
optional arguments:
-h, --help show this help message and exit
-v VERB, --verbose VERB
Enable Level of verbose output during processing. (0)
No Output; (1) Output Event Analysis counter; (2)
Counter and results. Default 2
--load-location LOADLOC
Specify Load destination. Default is BNG_RESULTS (and
sub-directories based on Station Name).
--plot Plot results at end (Default False)
--save Set this option if you wish to save the figure.
[Default does not save figure]
--format FMT Specify format of figure. Can be any one of the
validmatplotlib formats: 'png', 'jpg', 'eps', 'pdf'.
[Default 'png']
Station Selection Parameters:
Parameters to select a specific station.
--keys STKEYS Specify list of Station Keys in the database to
process.
Quality control parameters:
Quality control parameters on the estimates for calculating the average.
--cc CC Threshold for cross-correlation betwen vertical and
radial components. [Default 0.5]
--snr SNR Threshold for signal-to-noise ratio on vertical
component, in dB. [Default 5.]
--TR TR Threshold for transverse to radial ratio (1 - T/R).
[Default 0.5]
--RZ RZ Threshold for radial to vertical ratio (1 - R/Z).
[Default -1.]
Downloads three-component seismograms based on a catalogue of earthquakes and performs automated estimation of Rayleigh-wave polarization at a number of periods and for the direct and complementary globe-encircling path. Station selection is specified by a network and station code. The database is provided as a :class:`~stdb.StDb` dictionary. Each usable station-event seismograms are used to calculate an estimate of station orientation. For each estimate, the cross-correlation between the radial and Hilbert-transformed vertical components is calculated and is used later in selecting which estimates are used in the final estimate of station orientation.
$ dl_calc -h
usage: dl_calc [arguments] <Station Database>
Program to compute the orientation of the components of a station based on
those in a station database.
positional arguments:
indb Station Database to process from.
optional arguments:
-h, --help show this help message and exit
-v VERB, --verbose VERB
Enable Level of verbose output during processing. (0)
No Output; (1) Output Event Analysis counter; (2)
Counter and results. Default 2
-O, --overwrite Overwrite existing data on disk. [Default False]
--save-location SAVELOC
Specify Save destination. [Default is DL_RESULTS (and
sub-directories based on Station Name)]
--no-save-progress Do not save progress during processing.
Local Data Settings:
Settings associated with defining and using a local data base of pre-
downloaded day-long SAC files.
--local-data LOCALDATA
Specify a comma separated list of paths containing
day-long sac files of data already downloaded. If data
exists for a seismogram is already present on disk, it
is selected preferentially over downloading the data
using the Client interface
--no-data-zero Specify to force missing data to be set as zero,
rather than default behaviour. [Default sets to nan]
--no-local-net Specify to prevent using the Network code in the
search for local data (sometimes for CN stations the
dictionary name for a station may disagree with that
in the filename. [Default Network used]
Server Settings:
Settings associated with which datacenter to log into.
--server-cat SERVER_CAT
Catalogue server setting: Key string for recognized
server that provide `available_event_catalogs` service
(one of 'AUSPASS', 'BGR', 'EARTHSCOPE', 'EIDA',
'EMSC', 'ETH', 'GEOFON', 'GEONET', 'GFZ', 'ICGC',
'IESDMC', 'INGV', 'IPGP', 'IRIS', 'IRISPH5', 'ISC',
'KNMI', 'KOERI', 'LMU', 'NCEDC', 'NIEP', 'NOA',
'NRCAN', 'ODC', 'ORFEUS', 'RASPISHAKE', 'RESIF',
'RESIFPH5', 'SCEDC', 'TEXNET', 'UIB-NORSAR', 'USGS',
'USP'). [Default 'IRIS']
--server-wf SERVER_WF
Waveform server setting: Base URL of FDSN web service
compatible server (e.g. “http://service.iris.edu”) or
key string for recognized server (one of 'AUSPASS',
'BGR', 'EARTHSCOPE', 'EIDA', 'EMSC', 'ETH', 'GEOFON',
'GEONET', 'GFZ', 'ICGC', 'IESDMC', 'INGV', 'IPGP',
'IRIS', 'IRISPH5', 'ISC', 'KNMI', 'KOERI', 'LMU',
'NCEDC', 'NIEP', 'NOA', 'NRCAN', 'ODC', 'ORFEUS',
'RASPISHAKE', 'RESIF', 'RESIFPH5', 'SCEDC', 'TEXNET',
'UIB-NORSAR', 'USGS', 'USP'). [Default 'IRIS']
--user-auth USERAUTH Authentification Username and Password for the
waveform server (--user-auth='username:authpassword')
to access and download restricted data. [Default no
user and password]
--eida-token TOKENFILE
Token for EIDA authentication mechanism, see
http://geofon.gfz-
potsdam.de/waveform/archive/auth/index.php. If a token
is provided, argument --user-auth will be ignored.
This mechanism is only available on select EIDA nodes.
The token can be provided in form of the PGP message
as a string, or the filename of a local file with the
PGP message in it. [Default None]
Station Selection Parameters:
Parameters to select a specific station.
--keys STKEYS Specify list of Station Keys in the database to
process.
--zcomp ZCOMP Specify the Vertical Component Channel Identifier.
[Default Z].
-c NAMECONV, --coord-system NAMECONV
Coordinate system specification of instrument. (0)
Attempt Autodetect between 1 and 2; (1) HZ, HN, HE;
(2) Left Handed: HZ, H2 90 CW H1; (3) Right Handed:
HZ, H2 90 CCW H1 (4) Left Handed Numeric: H3, H2 90 CW
H1 [Default 2]
Timing Parameters:
Parameters associated with event timing and window length.
--start STARTT Enter Start date for event catalogue search. Note,
more recent of this value or station start date will
be used.
--end ENDT Enter End date for event catalogue search. Note, less
recent of this or the station end date will be used.
--window TWIN Enter time window length in days. A non-zero value
will cause the results to repeat for each set of twin
days in the operating window, calculating the change
in orientation over time. [Default 0]
Earthquake Selection Criteria:
Parameters associated with selecing the subset of earthquakes to use in
calculations.
--min-mag MINMAG Specify the minimum magnitude of Earthquakes to use in
the catalogue search. [Default 5.5]
--min-dist MINDIST Specify the minimum earthquake distance (in degrees).
[Default 5.]
--max-dist MAXDIST Specify the maximum earthquake distance (in degrees).
[Default 175.]
--max-dep MAXDEP Specify maximum Earthquake Depth (km). [Default 150.]
Collects the estimated azimuths previously calculated and calculates the mean value after some quality control thresholding based on the rotated waveforms. The error is obtained from a bootstrap analysis of robust estimates.
$ dl_average -h
usage: dl_average [arguments] <Station Database>
Program to average the orientations of the seismometer in a station database.
positional arguments:
indb Station Database to process from.
optional arguments:
-h, --help show this help message and exit
-v VERB, --verbose VERB
Enable Level of verbose output during processing. (0)
No Output; (1) Output Event Analysis counter; (2)
Counter and results. Default 2
--load-location LOADLOC
Specify Load destination. [Default is DL_RESULTS (and
sub-directories based on Station Name)]
--plot Plot results at end [Default False]
--save Set this option if you wish to save the figure.
[Default does not save figure]
--format FMT Specify format of figure. Can be any one of the
validmatplotlib formats: 'png', 'jpg', 'eps', 'pdf'.
[Default 'png']
--cc CC Cross-correlation threshold for final estimate.
[Default 0.8]
Station Selection Parameters:
Parameters to select a specific station.
--keys STKEYS Specify list of Station Keys in the database to
process.