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2.1.2b Variation in fold plunge direction of sinusoidal folds (continued) 2.1.2  

This sequence shows the affect of a sinusoidal fold in a 200 m thick layer, plunging to the North. Other orientations are not shown as reduced to the pole images would simply vary by rotation. The images show the variation in display formats between grey scale and pseudo-colour look up tables, and colour contours, and the differences between folds at inclinations of -50° and -90°, together with first vertical derivative images at the pole.
Click on the images to launch Noddy. A legend is provided at the end of this page.

Link	Grey Scale	Pseudo Colour	Contours
Folds plunging to 000 (North) -- Gravity	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
	Notice the strong asymmetry of the anomaly in north-south sections, and the asymmetry between the anticlines and synclines in the south.
Folds plunging to 000 (North) -- Magnetics at -50°	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
	Notice the asymmetry of the anomaly in north-south sections, and the asymmetry between the anticlines and synclines in the south.
Folds plunging to 000 (North) -- Magnetics at -90°	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
	Notice the weaker asymmetry of the anomaly in north-south sections, and the asymmetry between the anticlines and synclines in the south.
Folds plunging to 000 (North) -- Magnetics at -90° First Vertical Derivative	LOAD JPEG IMAGE	LOAD JPEG IMAGE	LOAD JPEG IMAGE
	Notice the weaker asymmetry of the anomaly in north-south sections.

Key	Survey Parameters	Scales
layer r = 1 k = 10-2 background r = 0 k = 0 image width 10,000 m	Inclination -50° or -90° Intensity 50,000 or 70,000 gamma Flight height 80 m	max min max min

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Copyright © 1998-2002 AGCRC & Mark Jessell

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