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During the variation of the elements over the entire chaotic zone as time increases, large eccentricities must occasionally be reached.
The unpredictable behaviour is called chaotic, and initial conditions that produce it are said to lie in a chaotic zone.
If the chaotic zone is bounded, in the sense that only limited ranges of initial values of the variables describing the motion lead to chaotic behaviour, the uncertainty in the state of the system in the future is limited by the extent of the chaotic zone; that is, values of the variables in the distant future are completely uncertain only within those ranges of values within the chaotic zone.
There are no observable asteroids with orbits within the chaotic zone, but there are many just outside extremes of the zone.
The important characteristic of the chaotic zone for asteroid motion near a mean motion commensurability with Jupiter is that it includes a region where the asteroid's orbital eccentricity is large.
By numerically integrating many orbits whose initial conditions spanned the 3 1 Kirkwood gap region in the asteroid belt, Jack Wisdom, an American dynamicist who developed a powerful means of analyzing chaotic motions, found that the chaotic zone around this gap precisely matched the physical extent of the gap.
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Already it appears that the parameters defining the orbits of several planets vary over narrow chaotic zones, but whether or not this chaos can lead to instability if given enough time is still uncertain.
Excessive time also is required to explore thoroughly a complete range of orbital parameters in numerical experiments in order to determine the extent of chaotic zones in various configurations (e.g., those in the asteroid belt near orbital mean motion commensurabilities with Jupiter).
Few chaotic zones have been detected numerically and confirmed experimentally.
Gas chimney is detected in seismic data as vertically aligned chaotic zones with low amplitude and reflectivity.
From Poincaré sections we observe two chaotic zones separated by Kolmogorov Arnold Moser (KAM) boundaries along the path of the particle.
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