Interpretation of seismic refraction tests – Easy Refract

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EasyRefract is the new software from GeoStru dedicated to interpreting seismic refraction surveys using the reciprocal method and the generalized reciprocal method (G.R.M.).

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Description

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Software for the interpretation of seismic refraction tests was implemented to ensure the quality standards of GeoStru, including ease of use, full control over operational phases, the preparation of the automatic report printing and the ability to export all the charts and graphs.

The definition of the array geometry is extremely flexible and does not impose constraints on the number of shots to be used in the analysis.

The software can guide the user through the analysis phases offering full control of the operative process.

The program has implemented an efficient locating system that allows editing the aerial photo of the research area.

Field data is extracted directly from the files generated by loggers (in formats like SEG2, SEGY, SU, etc.) and plotted to give the user the identification of the first arrivals, which can also be entered manually or by copy/paste.

As a function of identifying the first arrivals, the software can operate the regression analysis and identify the time travel curve.
Through this analysis phase, arrival times are assigned to the correct refractors.

After building the time travel curve and identifying the propagation velocity of the seismic signal in the different soil layers, the Generalized Reciprocal Method is applied.

This method is based on the research, in the time-distance diagram, of an optimal distance between geophones XY, in such a way that the seismic rays coming from opposing shot points, positioned symmetrically at the ends of the array, arrive from the same point of the refractor on the geophones placed in X and Y.

In addition to performing an automatic search of the optimal XY, EasyRefract provides, for the eligible values XY, the diagram of the velocity function with the standard deviation for each associated regression and the diagram of the time-depth function with the roughness value.

OTHER CHARACTERISTICS

    • Finding the area of intervention by the satellite map;
    • No constraint on the number of geophones or sources;
    • Import seismic data from files like SEG2, SEGY, SU, etc.;
    • Standard Guide for Using the Seismic Refraction Method for Subsurface Investigation;
    • Apply filter to traces;
    • Selection of the display amplification factor to be applied to different traces in files;
    • Definition of the first arrivals on the seismogram with the possibility to choose the zoom or to display on a separate window the segment of signal useful in search of first arrivals;
    • Manual definition of the first arrivals through direct entry or the use of copy-and-paste commands;
    • Customer definition of the time travel curves;
    • Automatic detection of slope change points;
    • Choice of the optimal XY on the diagram of the velocity function or on the diagram of the time-depth function;
    • Customizing the stratigraphy with the use of textures;
    • Exporting the calculation report in formats like doc, docx, pdf, etc.;
    • Export of all diagrams on files;
    • Export of stratigraphy in dxf.

ChangeLog

2023.21.4.908

18/01/2024

New release 2023

2022.21.4.898

14/10/2022

New Release 2022

2021.20.4.828

02/04/2021

New Release 2021

2020.20.4.628

01/07/2019

Bug fix

2019.20.4.518

29/03/2019

New Release 2019

2018.20.4.418

04/12/2018

New release 2018

2017.20.4.308

07/08/2017

Release 2017, general upddate and bug fix

2016.20.4.204

14/09/2016

  • Added the possibility to reverse the order of traces for every single project shot. 
  • Added the ability to truncate the acquisition of the paths during the import phase. This option is convenient for long investments that otherwise would make the management of the shots costly from the point of view of the memory used. 
  • Graphic improvements for tests with one or two images. 
  • Implemented Bing Maps for locations. 
  • Implement the reading of BISON-2 files with .dat extension. 
  • Implemented the possibility of reordering traces after they have been imported into the software. N.B. Before using the reorder tool, you must import all the shots. 
  • Customization of the colour that highlights the semi-wave of the traces. 
  • Polarity inversion for more trials at the same time. 
  • Improvement of the graphic area of travel time curves definition. 
  • Implemented the possibility of reversing the polarity of single waves. 
  • Graphical improvements. 
  • Improved the print preview of graphics. 
  • Implementation of the Critical Distance computation technique. 
  • Performance of Undo/Redo functions. 
  • Advances in the import of SEG2. 
  • Implement the export in *.csv and *.asc formats. 
  • Improvement regarding the search management of the work area. 
  • Added the ability to perform elaborations for Vs waves. The seismogram allows the import of the two shots (S1 and S2) to identify the S-wave arrival correctly. 

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