Calculates amplitudes on basis of incoming origins and the associated picks.
scamp measures several different kinds of amplitudes from waveform data. It listens for origins and measures amplitudes in time windows determined from the origin. Thus, in contrast to amplitudes measured by scautopick the considered time windows can depend on epicentral distance. The resulting amplitude objects are sent to the “AMPLITUDE” messaging group. scamp is the counterpart of scmag. Usually, all amplitudes are computed at once by scamp and then published. Only very rarely an amplitude needs to be recomputed if the location of an origin changes significantly. The amplitude can be reused by scmag, making magnitude computation and update efficient. Currently, the automatic picker in SeisComP, scautopick, also measures a small set of amplitudes (namely “snr” and “mb”, the signal-to-noise ratio and the amplitude used in mb magnitude computation, respectively) for each automatic pick in fixed time windows. If there already exists an amplitude, e.g. a previously determined one by scautopick, scamp will not measure it again for the respective stream.
Amplitudes are also needed, however, for manual picks. scamp does this as well.
Arrivals with weight smaller than 0.5 (default) in the corresponding Origin are
discarded. This minimum weight can be configured with
Amplitudes of many types are currently computed for their corresponding magnitudes.
In order to be used by scmag, the input amplitude names for the various magnitude types must typically match exactly. Exceptions:
Duration magnitude as described in HYPOINVERSE (Klein ).
Mjma is computed on displacement data using body waves of period < 30s.
Local (Richter) magnitude calculated on the horizontal components using a correction term to fit with the standard ML (Richter ).
Local custom magnitude calculated on the horizontal components according to Hessian Earthquake Service and Stange 
Local magnitude calculated on the horizontal components according to SED specifications.
Local magnitude calculated on the vertical component using a correction term to fit with the standard ML.
- AMN for MN
Nuttli magnitude for Canada and other Cratonic regions (Nuttli ).
Acceleration Input Data¶
For amplitudes to be computed, the input waveforms are usually given in velocity. Acceleration data, e.g. from strong-motion instruments must therefore be transformed to velocity. The transformation is enabled by activating the response correction. Activate the correction in the global bindings for all types or in a new Amplitude type profile for specific types.
Example global binding parameters for computing MLv amplitudes from accleration data. Here, the frequency range is limited to 0.5 - 20 Hz:
amplitudes.MLv.enableResponses = true amplitudes.MLv.resp.taper = 5 amplitudes.MLv.resp.minFreq = 0.5 amplitudes.MLv.resp.maxFreq = 20
scamp can be used to reprocess and to update amplitudes, e.g. when inventory paramters had to be changed retrospectively. Updating ampitudes requires waveform access. The update can be performed
In offline processing based on XML files (
--reprocesswill replace exisiting amplitudes. Updated values can be dispatched to the messing by scdispatch making them available for further processing, e.g. by scmag.
$ scamp --ep evtID.xml -d [type]://[host]/[database] --reprocess > evtID_update.xml $ scdispatch -O merge -H [host] -i evtID_update.xml
With messaging by setting
end-time. All parameters are read from the database.
--commitwill send the updated parameters to the messing system making them available for further processing, e.g. by scmag. Otherwise, XML output is generated.
$ scamp -u testuser -H [host] --commit \ --start-time '2016-10-15 00:00:00' --end-time '2016-10-16 19:20:00'
scamp inherits global options.
MLv, mb, mB, Mwp
Definition of magnitude types for which amplitudes are to be calculated.
The minimum arrival weight within an origin to compute amplitudes for the associated pick.
Timeout in seconds of the first data packet of waveform data acquisition.
Timeout in seconds of any subsequent data packet of waveform data acquisition.
- -h, --help¶
Show help message.
- -V, --version¶
Show version information.
- --config-file arg¶
Use alternative configuration file. When this option is used the loading of all stages is disabled. Only the given configuration file is parsed and used. To use another name for the configuration create a symbolic link of the application or copy it. Example: scautopick -> scautopick2.
- --plugins arg¶
Load given plugins.
- -D, --daemon¶
Run as daemon. This means the application will fork itself and doesn’t need to be started with &.
- --auto-shutdown arg¶
Enable/disable self-shutdown because a master module shutdown. This only works when messaging is enabled and the master module sends a shutdown message (enabled with --start-stop-msg for the master module).
- --shutdown-master-module arg¶
Set the name of the master-module used for auto-shutdown. This is the application name of the module actually started. If symlinks are used, then it is the name of the symlinked application.
- --shutdown-master-username arg¶
Set the name of the master-username of the messaging used for auto-shutdown. If "shutdown-master-module" is given as well, this parameter is ignored.
- -x, --expiry time¶
Time span in hours after which objects expire.
- -O, --origin-id publicID¶
OriginID to calculate amplitudes for and exit.
Dumps the filtered traces to ASCII when using -O.
- --verbosity arg¶
Verbosity level [0..4]. 0:quiet, 1:error, 2:warning, 3:info, 4:debug.
- -v, --v¶
Increase verbosity level (may be repeated, eg. -vv).
- -q, --quiet¶
Quiet mode: no logging output.
- --component arg¶
Limit the logging to a certain component. This option can be given more than once.
- -s, --syslog¶
Use syslog logging backend. The output usually goes to /var/lib/messages.
- -l, --lockfile arg¶
Path to lock file.
- --console arg¶
Send log output to stdout.
Execute in debug mode. Equivalent to --verbosity=4 --console=1 .
- --log-file arg¶
Use alternative log file.
- -S, --subscribe-group arg¶
A group to subscribe to. This option can be given more than once.
- --start-stop-msg arg¶
Set sending of a start and a stop message.
Test mode where no messages are sent.
List all supported database drivers.
- -d, --database arg¶
The database connection string, format: service://user:pwd@host/database. "service" is the name of the database driver which can be queried with "--db-driver-list".
- --config-module arg¶
The config module to use.
- --inventory-db arg¶
Load the inventory from the given database or file, format: [service://]location .
Do not use the database at all
List all supported record stream drivers.
- -I, --record-url arg¶
The recordstream source URL, format: [service://]location[#type]. "service" is the name of the recordstream driver which can be queried with "--record-driver-list". If "service" is not given, "file://" is used.
- --record-file arg¶
Specify a file as record source.
- --record-type arg¶
Specify a type for the records being read.
- --ep file¶
Defines an event parameters XML file to be read and processed. This implies offline mode and only processes all origins contained in that file. It computes amplitudes for all picks associated with an origin and outputs an XML file that additionally contains the amplitudes.
- -p, --picks¶
Force measuring amplitudes for picks only. Origins are ignored and time windows are independent of distance. Works only in combination with --ep.
Reprocess and update existing amplitudes. Manual amplitudes will be skipped. Works only in combination with --ep. This option can be used, e.g., for reprocessing amplitudes with new inventory information. Waveform access is required.
Forces reprocessing of all amplitudes, even manual ones.
- --start-time time¶
- --end-time time¶
Send amplitude updates to the messaging otherwise an XML document will be output.