| 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 the system or process that derived the data. e.g., the origin's AUTH is CI, but the subsource (the solution) was computed by JIGGLE |
| etype |
|
VARCHAR(2) |
NO |
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 |
| lddate |
|
DATE |
YES |
Load date. Date and time that the record was created, in Oracle date datatype |
| version |
|
NUMERIC(3, 0) |
NO |
Event version number. This attribute is incremented each time the preferred origin, magnitude or mechanism of the event is updated |