Table Of Contents

Previous topic


Next topic


This Page


Associates an Origin to an Event or forms a new Event if no match is found. Selects the preferred magnitude.


As a consequence of a real-time system the SeisComP3 system creates several origins (results of localization processes) for one earthquake because as time goes by more seismic phases are available. scevent receives these origins and associates the origins to events. It is also possible to import origins from other agencies.

Origin Matching

scevent associates origins to events by searching for the best match of the new (incoming) origin to other origins for existing events. If a match is not found a new event can be formed. The new origin is matched to existing origins by comparing differences in the horizontal components of the locations, origin time difference, and matching picks. The new origin is matched to an existing origin which has the highest rank in the following three groups (1, 2, 3):

  1. Location and Time (lowest)

    The difference in horizontal location is less than eventAssociation.maximumDistance (degrees) and the difference in origin times is less than eventAssociation.maximumTimeSpan.

  2. Picks

    The two origins have more than eventAssociation.minimumMatchingArrivals matching picks. Picks are matched either by ID or by time depending on eventAssociation.maximumMatchingArrivalTimeDiff.

  3. Picks and Location and Time (highest)

    This is the best match, for which both the location-and-time and picks criteria above are satisfied.

If more than one origin is found in the highest ranking class, then the first one of them is chosen.


For efficiency events in the cache are scanned first and if no matches are found the database is scanned for the time window eventAssociation.eventTimeBefore - eventAssociation.eventTimeAfter around the incoming Origin time. The cached events are ordered by eventID and thus in time.

No Origin Match

If no event with an origin that matches the incoming origin is found then a new event is formed and the origin is associated to that event. The following criteria are applied to allow the creation of the new event:

The agency for the origin is not black listed (processing.blacklist.agencies).


If the origin is an automatic then it has more than eventAssociation.minimumDefiningPhases picks.

alternate association of an origin by matching picks.

Associations of an origin to an event by matching picks.



scevent inherits global options.


Type: string

Prefix for all Event IDs


Type: string

Defines the pattern to generate an event ID.

%p : prefix

%Y : year

%[w]c: alpha character

%[w]C: upper case alpha character

%[w]d: decimal

%[w]x: hexadecimal

%[w]X: upper case hexadecimal

[w] is an optional width parameter. Default is %p%Y%04c.


Type: list:string

Defines a blacklist of event ids. The items of this list are only matches against %c, %C, %d, %x and %X of the eventIDPattern description. Year (%Y) and prefix (%p) are not matched. The match is case-sensitive, so blacklisting e.g. abcd would only match in combination with %c. If %C is used ABCD has to be blacklisted.


Type: int

Minimum number of station magnitudes referenced to a network magnitude to become a preferred magnitude. Default is 4.


Type: int

Minimum number of matching picks between two origins to be associated to the same event. Default is 3.


Type: float

If this time window in seconds is negative, pickIDs are compared to find matching arrivals. A non negative value (including 0) compares pick times regardless of the pickID. Pass: |pick1.time - pick2.time| <= threshold Default is -1.


Type: boolean

This parameter is only used in conjunction with eventAssociation.maximumMatchingArrivalTimeDiff. If a station has multiple associated arrivals for a particular event, this flag defines if the time distance of a new pick to all arrivals must be within eventAssociation.maximumMatchingArrivalTimeDiff or if one matching arrival is enough. Default is true.


Type: int

Minimum number of Picks for an Origin that is automatic and cannot be associated with an Event to be allowed to form an new Event. Default is 10.


Type: int

Time range before the origin time of an incoming origin to search for matching events. Default is 1800.


Type: int

Time range after the origin time of an incoming origin to search for matching events. Default is 1800.


Type: int

Associates an origin with an existing event if the origin time differs not more than 60 seconds unless the minimumMatchingArrivals criteria matches. Default is 60.


Type: double

Allowed location difference between an incoming origin compared with preferred origins to get associated. Default is 5.


Type: int

Minimum number of station magnitudes required for Mw(mB) to be considered as preferred magnitude. Default is 8.


Type: int

Minimum number of station magnitudes which ensures that Mw(mB) will be preferred and not mb. Default is 30.


Type: int

Average between mb and Mw(mB) which must be exceeded to become Mw(mB) preferred. Default is 6.


Type: boolean

If true, one magnitude will be preferred even if magnitude criteria are not fullfilled. Default is false.


Type: list:string

Magnitude type priority list for becoming a preferred magnitude for an event. Default is mBc, Mw(mB), Mwp, ML, MLh, MLv, mb.


Type: list:string

The agencyID priority list. When the eventtool comes to the point to select a preferred origin it orders all origins by its agency priority and selects then the best one among the highest priority agency. It also defines the agency priority for custom priority checks (eventAssociation.priorities).


Type: list:string

The author priority list. When the eventtool comes to the point to select a preferred origin it orders all origins by its author priority and selects then the best one among the highest priority author. It also defines the author priority for custom priority checks (eventAssociation.priorities).


Type: list:string

The general priority list to decide if an origin becomes preferred. This list is not used unless this parameter is activated. This example list replicates the default hard wired behaviour: AGENCY, STATUS, PHASES_AUTOMATIC, TIME_AUTOMATIC

Each item in the list corresponds to a check that is performed. Each check computes a score of the incoming origin (s1) and the current preferred origin (s2). If the s1 is lower than s2, the incoming origin is rejected and does not become preferred. All subsequent checks are ignored. If s1 is equal to s2, the next check in the list is performed. If s1 is larger than s2, the origin becomes preferred and all subsequent checks are ignored.

Available tokens:

AGENCY: check based on agency priorities

AUTHOR: check based on author priorities

STATUS: manual origins rule out automatic ones

METHOD: check based on the method priorities

PHASES: higher phase count = higher priority

PHASES_AUTOMATIC: only checks phase priorities for incoming automatic origins

RMS: lower rms = higher priority

RMS_AUTOMATIC: only check RMS on incoming automatic origins

TIME: more recent origins (creationTime) have higher priorities

TIME_AUTOMATIC: only check creationTime priority on incoming automatic origins


Type: int

Configures a timespan in seconds to delay event creation. If a new origin arrives which cannot be associated to an existing event, delay the event creation for a certain timespan.


Type: string

Region in which scevent is allowed to create events.


Type: double

Minimum depth for which scevent is allowed to create events.


Type: double

Maximum depth for which scevent is allowed to create events.


eventAssociation.delayFilter.* The delayFilter group configures an origin filter to activate the delay feature for this origin. If more than one filter is given they are combined with AND.


Type: string

The agencyID of the origin to be delayed.

Type: string

The author of the origin to be delayed.


Type: string

The evaluation mode of the origin to be delayed. Can be either "manual" or "automatic".



-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 be associated. When given no messages are sent. Only the status of the association is written to stdout.


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

--log-file arg

Use alternative log file.


-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.



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 from the given database or file, format: [service://]location


Do not use the database at all