Here are two attractive maps from a Swedish Tourist Board educational publication -- worth sharing. The left hand map shows the altitudes of the highest strandlines in southern and eastern Sweden. The right hand map shows the amount of land uplift recorded for the period 1840 to 1940. In one small area the recorded uplift was 9 dcm or 90 cms -- not far off a rate of 1m per century, comparable to the rate of rise going on in the southern Hudson Bay area in North America.
And here are three satellite images of raised beach ridges or strandlines from Höga Kusten -- if you see features like these on satellite imagery, you know you are looking at a region of rather rapid isostatic recovery. The top image is from near Rävlan and the other two are from Norrfällsviken.
You don't find features like these all around the complicated coasts of this area -- they occur only where there is reasonable exposure to onshore waves, and where there is an adequate sediment supply for the construction of beach ridges.
No comments:
Post a Comment