Hi Jean,

Thankyou for your response and interest. Nearly all of the failures were identified using Google Earth. Many are suspect due to the low resolution coverage over most of the Yukon. Those that fall within the high resolution coverage areas are easily identifiable and in some areas numerous. As the high resoultion coverage improves I keep adding more sites. The numbers are significant indeed.

I have had the opportunity to fly across the Peel Plateau on several occasions. In 2005 we did pass by the larger site marked in red; at the time I was able to photograph this and a few other failures along our flight path. I understand that others have as well but to what extent I am not sure.

After inspecting the red marker site from the air, photographing it and then later looking to see if I could pick it out on Google Earth (sometime later in 2005 or early 2006), it did not take long to find more features that had the same or similar characteristics - a few dozen to start with. At that time it was all low resolution coverage but with the newer high resolution coverage the total number is now in the hundreds (I have lost count). Some are in the range of 1km in length. I continue to look and add to my list as time permits.

I can send you the photographs of those that I have flown over if you like. I have not been on the ground so can't offer any more details or measurements.

The red marker site does show that the failure has gone through a transistion from being active and then partially stablizing. It appears to me it most likely created the small lake immediately upstream. I have looked at WorldWind and found this site but the resolution is such I think it would be hard to meaure change over time. The use of aerial photos from the past 40 to 50 years is probably the only way to do this comparison (such as what you have done so well) . I have no idea if the rate of change has accellerated or not.

I have discussed this briefly with Panya Lipovsky her with the Yukon Government but I don't know if she has had a chance to look at this in more detail.

I will sign off for now. Please stay in touch. Let me know if I can send you the photos.

Cheers,

Doug Davidge (kingpointnorth)