LocSAT

LOCSAT locator for SeisComP.

Description

The LocSAT locator interface implements a wrapper for the LocSAT locator written by Walter Nagy (according to the README file shipped with the LocSAT distribution).

Travel time tables

SeisComP ships with two predefined travel time tables: tab and iasp91. LocSAT travel time tables are located under share/locsat/tables/.

The default profile is iasp91.

Station corrections

LocSAT does not support station corrections natively. At least checking the code:

sta_cor[i]  = 0.0;    /* FIX !!!!!!*/

However the SeisComP wrapper adds this feature. It allows to define a .stacor file which defines corrections of observation times in seconds. A correction is substracted (not added) from the observation time to be compatible with the NonLinLoc station correction definitions (http://alomax.free.fr/nlloc/soft3.03/control.html#_NLLoc_locdelay_).

Each LocSAT profile (travel time table) can have an associated station correction file. To use station corrections for the iasp91 tables, the file share/locsat/tables/iasp91.stacor needs to be created.

A station correction table looks like this:

# LOCDELAY code phase numReadings delay
LOCDELAY GE.MORC P 1 -0.1

The forth column (numReadings) is ignored and just provided for compatibility reasons with NonLinLoc.

Format

• code (string) station code (after all alias evaluations)
• phase (string) phase type (any of the available travel time tables)
• numReadings (integer) number of residuals used to calculate mean residual/delay (not used by NLLoc, included for compatibility with the format of a summary, phase statistics file)
• delay (float) delay in seconds, subtracted from observed time

Configuration

LOCSAT.profiles

Type: list:string

Defines a list of available LOCSAT tab directories. Default is iasp91,tab.

LOCSAT.enableConfidenceEllipsoid

Type: boolen

Compute the confidence ellipsoid. Default is false.