event

Logical Entity Name | event
Default Table Name | event
Definition | Summary information on an event

event Attributes

Attribute/Logical Rolename | Domain | Datatype | NULL | Definition
evid |  | NUMERIC(15, 0) | NO | Event identifier. Each event is assigned a unique integer which identifies it in a database. It is possible for several records in the Origin relation to have the same evid. This indicates there are several opinions about the location of the event. The evid does not have to be identical to the local network’s event identifier, which is stored in the Origin table. This allows merging data for a single event from multiple sources without insisting that database evid is identical to the source’s local event identifier
prefor |  | NUMERIC(15, 0) | YES | Preferred origin. This attribute holds the origin identifier, orid, that points to the preferred origin for a seismic event
prefmag |  | NUMERIC(15, 0) | YES | Preferred magnitude. This attribute holds the magnitude identifier, magid, that points to the preferred magnitude for a seismic event or an origin
prefmec |  | NUMERIC(15, 0) | YES | Preferred mechanism. This attribute holds the mechanism identifier, mecid, that points to the preferred mechanism for a seismic event or an origin
commid |  | NUMERIC(15, 0) | YES | Comment identification. This is a key used to point to free-form comments entered in the Remark relation. These comments store additional information about a tuple in another relation. Within the Remark relation, there may be many tuples with the same commid and different lineno, but the same commid will appear in only one other tuple among the rest of the relations in the database
auth |  | VARCHAR(15) | NO | The auth field specifies the source of the information. This may be a network identifier (FDSN or otherwise), or any other string indicating the source of the information in the record
subsource |  | VARCHAR(8) | YES | A second identifier to specify a unique source within the domain specified by auth
etype |  | VARCHAR(7) | YES | This attribute is used to identify the type of seismic event, when known
selectflag |  | NUMERIC(1, 0) | YES | This flag describes the “definitive” definition of an event. Helps to differentiate which event to use from two different real-time systems
version |  | NUMERIC(3, 0) | YES | Event version number. This attribute is incremented each time the preferred origin, magnitude or mechanism of the event is updated
lddate |  | DATE | YES | Load date. Date and time that the record was created or last modified, in Oracle date datatype

event Relationships

Parent Entity | Child Entity | Type | Foreign Keys
mec | event | Non-Identifying | prefmec
netmag | event | Non-Identifying | prefmag
origin | event | Non-Identifying | prefor
remark | event | Non-Specific |
event | origin | Non-Identifying | evid
event | significant_event | Identifying | evid

event Check Constraints

Check Constraint Name | CheckConstraint
event01 | etype in ('le','re','ts','qb','nt', 'ca','sn','uk','st')
event02 | evid > 0