See user guide.
Non-standard processing modules that are not part of the normal MASW processing procedure, but often necessary and useful, are included under "Utility" in the main menu.
creative in handling those processing results obtained at various stages. The ultimate goal of using the utility modules will be to understand more precisely about data set at different stages of the processing sequence through various approaches of non-conventional non-standard evaluation procedures.
Most modules, except for "Format TEXT data" and "Make Common Seismic Gathers", are accessible within the same "Utility" dialog (Figure 1). The other two modules have their own separate dialogs as illustrated in Figure 2. The type of task each module performs is briefly explained below.
Format SEG-2 Files
The basic and minimum input data element for PS is one record that consists of a suite of an individual channel's recordings, called "traces." The field records should be saved in the SEG-2 format (Pullan, 1990), which is an engineering standard that most engineering seismograph have adopted as the default output format. Other text data files can be converted to the PS format by using a conversion
module ("TXT2PS") that can be foud under "Utility" in the main menu. All SEG-2 records are internally converted to PS format as soon as they are imported by the program, and all intermediate and final outputs of seismic data sets will be in this PS format.
All SEG-2 records imported by the ParkSEIS (PS) software are first internally converted to another format called "PS format" that is a modification of the "KGS format (or modified SEG-Y format)" (WinSeis User's Manual, 1997). This conversion is necessary to handle seismic data in a faster and more accurate manner for advanced and non-conventional wavefield operations commonly used in various stages of MASW data processing. In PS format, each channel's data set (called a "trace") is saved as a combina¬tion of a header (of 120 elements of 2-byte integer each), followed by data samples (of 4-byte floating-point value each). A complete listing of the "PS Header" can be displayed by choosing "PS Header" on the main menu's "Info" item. All output of seismic data are saved in PS format with the "DAT" extension (e.g.,"Output.dat").
Stack (+/-) Seismic Records
This module can stack two different records by summing (+) or subtracting (-) data values. A scaling factor can be applied to each record, if necessary, before the operation. This module can be useful when handling seismic records and dispersion image records (also called "overtone" records) to meet some experimental purposes.
Make 2D Vs Map from Layers
Inversion of one dispersion curve (*.dc) will generate its own output of one layered-earth model (*.LYR). The 2D shear-wave velocity (Vs) cross section is created by combining a multiple number of such LYR files at the end of the inversion that processed a multiple number of input dispersion curves. This module can generate such a 2D Vs cross section from a multiple number of LYR files of your own selection.
One or more layered-earth model (*.LYR) files can be remapped according to a common depth model, which is defined by another "reference" LYR file. This remapping can be useful when comparing files (LYR's) of different depth models, or constructing a 2D Vs cross section from multiple LYR files to bypass some unfavorable interpolation effects introduced by the plotting module.