| Value: | 1 |
| Description: | Code that indicates that all strong motion messages should be retrieved, regardless of whether they are associated with an event or not. |
| Value: | 2 |
| Description: | Code that indicates that only strong motion messages that are not already associated with an event, should be retrieved. |
| Value: | 0 |
| Description: | Code for no type of search defined. This is not supported by any functions, and exists to prevent 0(the default value) from being used as a meaningful code. |