Abstract
High Resolution AeroMagnetic surveys (HRAM) are a novel tool experimented in several countries for volcano and earthquake hazard re-assessment, ground water exploration and mitigation, hazardous waste site characterization and accurate location of buried ferrous objects (drums, UXO, pipelines). The improvements achieved by HRAM stem from lower terrain clearance coupled with accurately positioned, real-time differential navigation on closely spaced flight grids. In field cultural noise filtering, advanced data processing, imaging and improved interpretation techniques enhance data information content. Development of HRAM approaches might also contribute to mitigate environmental hazards present throughout the Italian territory. Hence an HRAM field test was performed in July 2000 in Friuli, North-Eastern Italy to assess the capabilities and limitations of HRAM over a buried pipeline and a domestic waste site. A Cesium magnetometer in towed bird configuration was used on two separate grids. Profile line spacing was 50-100 m and bird nominal ground clearance was set to 50 m. Microlevelled total field magnetic anomaly data forms the basis for subsequent advanced processing products including 3D analytic signal, maximum horizontal gradient of pseudo-gravity and 3D Euler Deconvolution. The magnetic signatures we detected and enhanced over the environmental test site area in Friuli are also compared with similar but more extensive HRAM signatures recently observed in other countries.
Highlights
Environmental characterization and hazard studies may benefit from improvements in the resolution power of relatively low cost aeromagnetic surveys
High Resolution AeroMagnetic surveys (HRAM) (High Resolution AeroMagnetic) surveys compared to reconnaissance campaigns stem from lower terrain clearance, tighter line spacing, more accurate real-time magnetic and positioning data acquisition, and enhanced data processing and display techniques
HRAM experience is lacking in Italy to date, despite the variety of environmental problems which the Italian territory and population faces
Summary
HRAM (High Resolution AeroMagnetic) surveys compared to reconnaissance campaigns stem from lower terrain clearance, tighter line spacing, more accurate real-time magnetic and positioning data acquisition, and enhanced data processing and display techniques. Pumped magnetometers have a resolution of 0.001 nT and cycle at 10 Hz so ground sampling rate can be reduced to 2-5 m This leads to precise delineation of much shorter wavelength magnetic anomalies related to shallow-source, man-made or natural, geologic features. Detection of hazardous Unexploded Ordnance (UXO) has recently been achieved by very high-resolution low level helicopter-borne surveys (Lahti et al, 2001) Many of these diverse natural and man-made environmental problems pose well recognized hazards for the Italian territory. An attempt to perform higher resolution aeromagnetic surveying in the area of Roccamonfina volcano was made with an Italian helicopterborne platform in 1994 and was mainly targeted to regional structural mapping rather than to volcanic hazard (Chiappini et al, 1998). The magnetic signatures we identified and enhanced over a major buried pipeline and over a small domestic waste site are described in comparison with similar but more extensive HRAM patterns detected by others outside the Italian territory
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