A LSD (Locsmith Seismic Data) structure defines the data set used for the location of an event. It is the output of MKLSREADLSD, and thus contains all data given in a .lsd file. It is a self contained set of data that may go directly into the location.
LSD structures consist of the following fields
and sub-structures
LSD structures use numeric intervals for most data: The data is not represented by a "mean" value and a uncertainty, but by an interval which encompasses the true value. Such numeric intervals consist of two to three numbers, denoting the lower and upper bound of the interval and optionally a "likely to be true" value.
Numeric Intervals are stored in three element vectors. The first element denotes the lower bound, the second the upper bound value and the third element is the "likely to be true" value, which might be NaN. (the third value is ignored anyway)
Undefined strings are empty.
Undefined numeric scalars are NaN.
Undefined numeric intervals are [NaN NaN NaN].
Field | Type | Units | Description |
---|---|---|---|
statcnt | numeric scalar | - | number of stations defined in STATION sub structure |
eventcnt | numeric scalar | - | number of events defined in EVENT sub structure |
arrivalcnt | numeric scalar | - | number of arrival data records defined in ARRIVAL sub structure |
station | array of sub structures | - | defines name and location of all stations see sub structure definition for details. |
event | array of sub structures | - | defines name and locations of all events used see sub structure definition for details. |
arrival | array of sub structures | - | defines arrival data: arrival times, azimuths, etc see sub structure definition for details. |
Field | Type | Units | Description |
---|---|---|---|
id | string | - | Station Identifier string |
lon | numeric interval | ° | station longitude |
lat | numeric interval | ° | station latitude |
elev | numeric interval | km | station elevation above reference sphere |
Field | Type | Units | Description |
---|---|---|---|
id | string | - | Event identifier string |
info | string | - | a string containing informal additional info |
lon | numeric interval | ° | event location constraint from external evidence |
lat | numeric interval | ° | event location constraint from external evidence |
depth | numeric interval | km | event location constraint from external evidence |
ot | numeric interval | s | event origin time constraint from external evidence |
Field | Type | Units | Description |
---|---|---|---|
id | string | - | data record identifier |
station | string | - | identifier of station at which the data was observed |
event | string | - | identifier of event with which data is associated |
phase | string | - | seismic phase name: the phase to which the observation is associated |
at | numeric interval | s | arrival time of phase |
baz | numeric interval | ° | direction from which the phase arrived, measured from wave polarization |
emerg | numeric interval | ° | steepness with which phase comes out of the bottom, measured from wave polarization |
slo | numeric interval | s/° | Slowness of phase, measured from polarization and surface velocity or by station array. |