Liquefaction Analysis software

The CPT-Analyst Program is a WINDOWS compatible, interactive computer program.  CPT-Analyst runs on a PC compatible computer with a Pentium processor having at least 64 mb of RAM using the WINDOWS 98 or newer operating system. The program is furnished as executable machine code (.EXE file) on a CD-ROM.  CPT-Analyst accesses a CPT sounding file that can contain data for up to 2000 readings and create up to 200 layers.  The program creates a report to the printer or disk-data files of tabulated output summaries and graphical plots of the output.  A sample data file and associate files than contain the material classification information are included for use with CPT-Analyst. These files can be modified and used at templates for future projects.  In recognition of the potential for differing professional opinions and site specific data than can be developed for a project and what parameters should be assigned to different materials, instructions are given so that the user can generate his own material behavior-data file. 


This software was initially developed in 1986 but was not widely distributed.  However due to a increased interest and cone penetration test usage and the powerful interactive nature of the Windows Operating System, the software was adapted and update to the Windows environment.  If you use the program, then it is only fair that you pay for it.  This will also help support future improvements.  If you have suggestions for improvements, then please send them to me.  If you have a request for changes to the software to meet your specific needs, then an agreed price for making those changes can be worked out.  However, if the changes are of a general nature that the program author deems marketable to others, then the changes may be incorporated in normal program updates.
One of the biggest benefits of using the cone penetrometer as a logging tool is that it can give a near continuous profile of soil conditions throughout the entire sounding.  The disadvantage is that it can produce huge amounts of data that must be reduced and manipulated before it can be used and interpreted by an engineer.  To date, the methods used to interpret the data have been widely varied. Solutions range from coarse  visual interpretation to detailed processes using different computer programs that produce huge amounts of printouts.

The method that is proposed using this computer code preserves the advantages of the CPT and by making the data interpretation easy.  This program allows the engineer to quickly work with the CPT data and make decisions on how the profile is to be broken up into layers that can be used for further analysis.  If the data are for a slope stability problem, then small weak layers are very important and the engineer may want to break them out for examination.  If the data are to be used for a settlement analysis then the engineer may not want to break out layers that are quite thin to keep the amount of data needed for settlement analyses to reasonable amounts.  This computer program allows the engineer quickly decide while allowing the computer to perform the tedious calculations necessary to use the CPT data as desired

Program Implematation

The program, as now implemented, is very simple and very interactive.  It is based on a simple premise that one of my Professors used to say “If a picture is worth a thousand words, a graph is worth a million numbers.”  The program is optimized to be very responsive for the interactive selection and editing of layers.  This is done by plotting the sounding results on the screen using colors and symbols to convey a large amount of information to the user that can be quickly interpreted.  This allows the engineer to efficiently perform his or her work and then move onto other tasks. Descriptions of the menu and what each option does are discussed later

Ned Larson, PE, GE,

If you are interested in purchasing CPT-Analyst contact Mr. Larson at

Download Manual For Review

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EQLique&Settle”2” Computer Program

Below are listed some introductory features of the computer program EQLique&Settle”2” for assessment of liquefaction potential and earthquake-induced settlements.  Results of analyses for projects using this program have been reviewed and accepted as being correct by agencies such as the California Geological Survey (CGS), Los Angeles County, Los Angeles City, and for other projects in cities in Orange and San Diego Counties.  There is no need to read values off any charts at all, including the values of volumetric strain above and below ground water, which are used by the program to calculate cumulative earthquake-induced settlements.  The program is FULLY computerized.  All of the procedural charts are built-in.  Importing field CPT data is very easy and fast, and then the analysis is run in less than 2 seconds!

Edward Castellanos, PE, GE, MSCE
California-Registered GE #191

To Purchase EQLique&Settle”2”contact Ed at

Introduction to EQLique&Settle”2”

SampleLIQ ReportText


Liquefaction potential evaluation sheet

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