Hyderabad Boulder site: a repeatability study


Courtesy of Courtesy of Advanced Geosciences, Inc.

This test was carried out in Hyderabad, India in November 1996 in order to demonstrate the repeatability of the readings obtained using the Sting/Swift system. Noteable is the almost perfect match between the two datasets, this indicates a high degree of repeatability for these measurements.

The finding of this test is that the Sting/Swift combination yields good repeatable measuring results for 2D imaging using Dipole-Dipole arrays. It is well known that these arrays suffer mathematically from low signal returns when depth penetration is increased by separating the dipoles. Nevertheless, thanks to the superior S/N ratio of the Sting receiver and the specially designed Swift cables, it is possible to acquire high quality imaging datasets also for this array type.



  • Test objective: to demonstrate the Sting/Swift data and inverted result repeatability
  • 28 Swift smart electrodes were placed at 3 meter intervals.
  • Two complete dipole-dipole data sets were recorded without moving the electrodes.
  • The two profiles were automatically recorded by Sting using the built-in Dipole-Dipole program using the exact same electrodes.
  • The two data sets, shown above, each comprising 215 measurements, have been inverted from apparent resistivity to resistivity using the RES2DINV software.
  • The pronounced positive anomaly at about 36 meter is assumed to be caused by a granite boulder. Such boulders are frequently occuring in the area.

The recorded data were separately inverted and interpreted using the RES2DINV software package, Surfer for Windows was used for result presentation in the sections shown above.

In conclusion the test result show that the Sting/Swift system is capable of recording high quality repeatable imaging data using even the 'difficult' Dipole-Dipole array.

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