Ok, this one from today at the Army barracks not as interesting as the girdling but deserves some comment.
E. Tereticornus with a pronounced lean (before falling over!) and again an asymmetrical canopy (not really uncommon in Eucs)
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When we look at the exposed root plate its clear that there is something very important missing..roots on the tension side to the fall. There are three significant sinker roots on that side (red arrows) but no primary roots (red circle), there's a good healthy root on the left side as we look at it.
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The answer? (isn't hindsight wonderful especially when you can see the root system) trenching for electrical supply on two sides of the tree (yellow lines) even though the trenching was done 10-15yrs ago the tree has not been able to produce roots of enough size to resist the wind loading after our heavy rain in the last week.
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SF