NonLinLoc Version 2.37 (14Oct2003)
Most of the NonLinLoc software is distributed under the GNU General
Public License (GNU GPL).
(or look at a local copy of
the GNU General Public License).
See the NonLinLoc Updates
page for a description of New Releases, Updates and Bugs.
Download this NonLinLoc 2.30
software guide in PDF
Previous release: NonLinLoc
Version 2.32
Contents:
Overview
The NonLinLoc (Non-Linear Location) package is a set of programs and
utilities for velocity model
construction, travel-time calculation and probabilistic, non-linear,
global-search earthquake location
in 3D structures, and for visualisation of 3D volume data and location
results. Many of the programs
operate with 3D volumes, usually in the form of a 3D Grid
structure which defines a specific,
gridded, rectangular volume in space.
See the NLLoc program documentation
for a description of the non-linear
location inversion approach and algorithms.
See the book chapter Probabilistic earthquake location in 3D and
layered models: Introduction of a
Metropolis-Gibbs method and comparison with linear locations
(Lomax, et al., 2000) for further information on NonLinLoc and
for an examination of
synthetic 3D and 1D locations.
See the report Comparison of NonLinLoc and linear earthquake
locations
in a 3D model
for an examination of real 3D locations.
The Programs
The NonLinLoc package consists of the following programs:
| NLLoc |
Non-Linear Location - Determines the location for one
or more events within a 3D Grid using a systematic grid-search, a
stochastic, Metropolis-Gibbs search, or a hybrid "Oct-Tree" method.
(outputs misfit or probability density function (PDF) on a 3D Grid, PDF samples or
"scatter cloud", description of best hypocenter, and other results).
|
| Vel2Grid |
Velocity model to 3D Model Grid - Given a velocity
model description, creates a model grid. (outputs a 3D Grid) |
| Grid2Time |
3D Model Grid to Travel Time Grid - Given a 3D Model
Grid, calculates travel times from a point within a 3D Grid to all
other points within the grid. Optionally calculates ray take-off angles
withing the 3D Grid. (outputs a set of 3D Grids) |
| Time2EQ |
Travel Time Grid to Synthetic Observations - Given a
hypocenter location and a set of travel time grids, calculated
predicted travel times. (outputs a Phase file in NonLinLoc format)
|
| LocSum |
Location Summation - Utility that combines NLLoc
location results and PDF "scatter-cloud" samples from a number of
events. (outputs a single set of summary location files) |
| Grid2GMT |
Grid to GMT commands - Utility that creates a command
script for plotting plotting sections and plan views of 3D Grid files,
and misfit, PDF and location "scatter-cloud" results using the GMT plotting package.
|
| Utilities |
Miscellaneous utility programs - Utilities for
conversion between HYPOELLIPSE summary or FPFIT summary formats and
NonLinLoc Hypocenter-Phase location format. |
In addition, the following analysis and visualiation software
suports NonLinLoc event location output formats:
| SeismicityViewer
|
Java applet for viewing seismicity in 3D -
Interactive, animated, local or Internet-based viewing in 3D of
hypocenters, PDF "scatter-clouds", error-ellipses, residuals,
geographic data and other information. |
A Typical Location Run
A typical location run involves:
- obtaining seismic phase time picks in a supported format (see Phase File Formats)
- determining a 3D search region and velocity model for this
region
- using Vel2Grid or other software
to produce a velocity or slowness model 3D
Grid File for the search region for each phase type, (i.e. P or S).
- using Grid2Time to produce
travel-time and ray take-off angle 3D
Grid Files for each phase type at each station
- using NLLoc to locate each event
defined by the phase picks using a nested grid-search or
Metropolis-Gibbs search over a 3D volume
- using the utilities LocSum and Grid2GMT or SeismicityViewer to process and
plot the location results
Getting
Started - Download the NonLinLoc Software
NonLinLoc
Version 2.37 (14OCT2003)
- Download the NonLinLoc Software and compile it on your machine: Source code and makefile, or
- Download the NonLinLoc Linux binary executables: Linux binaries
NOTES:
- With gcc and Sun Solaris 2.6 on a Sun
Workstation I have successfully
compiled the NonLinLoc software using the command
make distrib.
With gcc and Linux(SuSE 6.4) on a PentiumIII PC I have successfully
compiled the NonLinLoc software using the command make -R distrib.
If you have successfully installed and run the NonLinLoc software on
another system, I would appreciate hearing about the details of your
hardware, operating system, compiler and compiler flags. Thanks. anthony@alomax.net
- Grid2GMT: I have made changes to Grid2GMT to
support GMT 3.3.6, though there seems to be bugs or other problems,
i.e. the labeling of scale bars is incorrect. If you use an earlier
version of GMT, you may need to change the line
#define
GMT_VER_3_3_4 1 in Grid2GMT to #define GMT_VER_3_3_4 0.
SeismicityViewer
Download the SeismicityViewer java code and class files: SeismicityViewer
Try the Sample
Location Problem
Version 3.00 (18APR2001) - Download the NonLinLoc Sample Location
control and output files:
Sample location files
Install and run the Sample Location
tutorial to create a velocity grid, calculate travel times and
locate an event, and visualise the results results.
Give your feedback
Acknowledgements
The utility, quality and evolution of the NonLinLoc software
package depends entirely on feedback from its users. Many thanks to the
following people for contributions, bug reports, comments and
suggestions for the
NonLinLoc software:
- Giuseppe Aliberti: formerly University of L'Aquila, Italy
- Alexandre Nercession: IPGP, Paris, France
- Rick Aster: New Mexico Inst Mining and Tech, USA
- Alberto Michelini: OGS, Trieste, Italy
- Stephan Husen: ETH, Zurich, Switzerland
- Mariella Simini: Univ. Naples, Italy
- Jerry Sweeney: Lawrence Livermore National Laboratory,
Calif., USA
- Laura Sattolo, Paolo Di Bartolomeo: OGS, Udine, Italy
- Carsten Riedel: University of Hamburg, Germany
- David Monterroso: Uppsala University,Sweden
|
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Software page.
This document was last updated 15 Oct 2003.
