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Super- HRAM (Helicopter) DataExample 1 – Thrust fault detectionBy flying closer to the ground, and with a tighter line spacing, the helicopter-borne systems can detect even the most subtle sedimentary magnetic anomalies that are created in the shallow sedimentary section. In the example below, the superior resolving power of the S-HRAM survey can be seen, when compared to the HRAM data.
A thrust fault has been identified in the HRAM data, based on the occurrence of a southeast-trending dipolar magnetic anomaly (top right of HRAM image). Based on the magnetic pattern, it appears that the thrust fault is offset with a sinistral sense. This would suggest a tear fault within the sedimentary section. To determine if such a thrust fault exists, the area was re-flown using a Super-HRAM platform. The data from the Super-HRAM survey shows a very different story. Although the position and orientation of the thrust anomaly are the same, the character and geometry of the Super-HRAM magnetic anomaly(s) are very different. The dipole anomaly in the HRAM is now resolved as a series of magnetic ‘stripes’. The break in the anomaly, as imaged by the HRAM data, is now seen to be a continuous, S-shaped bend in the surface exposure of the sediments. Such geometry is more reminiscent of a lateral ramp in the hangingwall of the thrust, rather than a tear fault. A second dipole in the HRAM data (bottom left) is not imaged as robustly in the Super-HRAM data, and may simply be related to topographic features at surface.
The addition of seismic data allows for an integrated interpretation. In this example, the magnetic anomalies are associated with the sedimentary units, not with any ‘exotic’ mineralization along the thrust plane. Seismic and magnetic data combine to provide a very powerful tool in shallow geological environments. Example 2 – Shallow channel detection. Example 3 – Fold mapping in the mountain belt. back to Super- HRAM (Helicopter) Data
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