Toggle navigation
About
What we do
GTT Team
Copyright
Donate!
Store
Trails
Tutka Backdoor
Kachemak Map
Landslides
Energy
Alaska Energy Blog
White Papers and Reports
Older Writing
Issues
Alaska Coal
Alaska Fisheries
Alaska Metals Mining
Alaska Oil and Gas
Climate Change in Alaska
Forestry
Infrastructure in Alaska
Renewable Energy in Alaska
Books
Mud Flats and Fish Camps
My Coyote Nose and Ptarmigan Toes
Small Feet, Big Land
A Long Trek Home
Reports
Expeditions
Ring of Fire
Bering Straits Spring
Tracing the Heart of Alaska
Where the Heck is Donlin?
Life on Ice
A Long Trek Home
Journey on the Wild Coast
Fig. 5: Iliamna terrace interpretations
— We propose three different hypotheses to explain our
terrace elevation data
along Lake Iliamna. Firstly, there may have been no crustal deformation (a) during lake-level decline. This hypothesis fails to explain a large section of coast where no profiles show scarps as high as those further to the northeast. Secondly, isostatic rebound might have tilted the lake over time (b) leading to older beaches being sloped along their length. Though along two large sections of coast the uppermost scarp lies at roughly the same elevation, this might be coincidental, and the true highest scarp may have been eroded away on many of these profiles. However this interpretation still fails to explain the location of the uppermost wave-cut scarp on profiles 10 and 11. On profile 10, our survey did not reach the highest beach feature, and yet the hypothesis depicted here predicts it would. On profile 11 the uppermost scarp lies well below the prediction, and the scarp is not tall enough to have removed some higher scarp. Lastly, the terraces might be roughly flat, but offset by localized deformation on or over an active fault (c). This hypothesis can explain all the data.
Share
Facebook
Twitter
Attribution and Copyright info
By
Content on this page is available under a license.