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AGI STING/Swift case history 4

Hyderabad Boulder site
a repeatability study

Summary:

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.

Description

• 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 exactly the same way.
• 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.

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.

Last modified: 2006-09-07 18:29:27 EDT

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