This guide introduces the fundamental steps to process seismic refraction tomography with smartTomo software. The demo version is distributed with a pre-loaded dataset. The characteristics of the dataset are described in this article (Demo version). At startup the following screen appears reminding you that this is a demo version and it shows the list of files that will be loaded.
After pressing OK, the dialog box will be displayed and the can set the geometry of both shots and geophones. On the left side of the window the positions of the shots are listed while the summary of the locations of the geophones are shown on the left. It is possible that for the same processing there are several groups of geophones, for example when performing an acquisition with a work-away configuration.
2018.0 has been tested to verify the speed of execution as the number
of nodes increases. A synthetic dataset of 12 shots recorded with 96
channels was used for the test.
The test was conducted by decreasing the size of the cells and, for each dimension, using both 6 and 11 nodes per side. The test has been performed on a MacbookPro configured as follows: Processor name: Intel Core i5 Processor speed: 2.9 GHz Number of processors: 1 Total number of Core: 2 Cache L2 (for Core): 256 KB Cache L3: 3 MB Memory: 16 GB
smartTomo 2018.0 has shown to have a linear behavior with respect to the increase in the number of nodes both for the execution time and for the memory used.
The graph on the left shows oscillations due to the number of nodes per
cell side. Increasing the number of nodes per side improves the
definition of seismic rays but complicates some calculation steps.
Concluding, for a section 212 meters long, 25 meters deep with a resolution of 0.5 meters and 11 nodes per cell side (407541 nodes) it takes 51 seconds for 5 iterations and 4.55GB of ram, obtaining a maximum error on time of first break less than 5%.