scamp

Calculates amplitudes on basis of incoming origins and the associated picks.

Description

scamp measures several different kinds of amplitudes from waveform data. It listens for origins and measures amplitudes in time windows determined from the origin. 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 SeisComP3, 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. Picks with weight smaller than 0.5 in the corresponding Origin are discarded.

Amplitudes for the following magnitudes are currently computed:

MLv

Local magnitude calculated on the vertical component using a correction term to fit with the standard ML.

MLh

Local amplitude calculated on the horizontals.

mb

Narrow band body wave magnitude using a third order Butterworth filter with corner frequencies of 0.7 and 2.0 Hz. Note that this amplitude is also computed by scautopick for all automatic picks.

mB

Broad band body wave magnitude.

Mw(mB)

Estimation of the moment magnitude Mw based on mB.

Note that in order to be used by scmag, the input amplitude names for the various magnitude types must match exactly.

Configuration

etc/defaults/global.cfg

etc/defaults/scamp.cfg

etc/global.cfg

etc/scamp.cfg

~/.seiscomp3/global.cfg

~/.seiscomp3/scamp.cfg

scamp inherits global options.

amplitudes

Type: list:string

Definition of amplitude types to be calculated. Default is MLv, mb, mB, Mwp.

Command-line

Generic

-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, eg 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

Sets 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

Sets 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.

--dump-records

Dumps the filtered traces to ASCII when using -O.

Verbosity

--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

Limits the logging to a certain component. This option can be given more than once.

-s, --syslog

Use syslog logging back end. The output usually goes to /var/lib/messages.

-l, --lockfile arg

Path to lock file.

--console arg

Send log output to stdout.

--debug

Debug mode: --verbosity=4 --console=1

--log-file arg

Use alternative log file.

Messaging

-u, --user arg

Overrides configuration parameter connection.username.

-H, --host arg

Overrides configuration parameter connection.server.

-t, --timeout arg

Overrides configuration parameter connection.timeout.

-g, --primary-group arg

Overrides configuration parameter connection.primaryGroup.

-S, --subscribe-group arg

A group to subscribe to. This option can be given more than once.

--encoding arg

Overrides configuration parameter connection.encoding.

--start-stop-msg arg

Sets sending of a start- and a stop message.

--test

Test mode where no messages are sent.

Database

--db-driver-list

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 configmodule to use.

--inventory-db arg

Load the inventory database from a given XML file.

--db-disable

Do not use the database at all

Records

--record-driver-list

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.