Modules locating the earthquake hipocenter create localization objects (QuakeML Origin) that attach to the event (QuakeML Event). There may be many locations for a given event, differing in location method, velocity model, seismic phases used. QukeML has the ability to indicate one preferred location. Some modules have the ability to set the preferred location option. In the configuration set, this is usually the position::
<preferredOrigin>1</preferredOrigin>
Some modules may be able to set this option in the graphic window of the module. If they don't have it, you need to edit the configuration file. If you select option 1, that method is preferred for that particular location. This means that if the preferred location is not defined yet, then after saving the location it is indicated as the preferred location, and if the preferred location is already defined, a message appears in which the ID of the existing preferred location and the new location are provided and the question whether the preferred location is to be replaced (Fig. 5). You can select preferred location options for several modules. Then the event object indicates the last confirmed location as the preferred one.
Fig. 5 Message with the ID of the preferred location
Location methods, in addition to the coordinates and time of the event, provide a different amount of information, such as location error, takeoff angles, wave incidence angle and azimuths, etc. There are methods for locating in geographic or Cartesian coordinates, however, the result is always saved in geographic coordinates.
The following seismic location methods are currently availabl
The location can also be defined manually without using the modules by editing the Origins item in the Elaboration window. After pressing the right mouse button, the Add Origins option appears (1), after pressing it, a new Origin with zero values is added (2). After clicking the right mouse button on the origin, a window with options for modifying the location opens (3).
Fig. 14 Elaboration window with the indicated Origins module with an empty location.