National Geographic : 1910 Jan
THE GEOGRAPHIC SOCIETY'S ALASKAN EXPEDITION Scale: S 0 6 _ , 1'/LES VARIEGATED AND HAENKE GLACIERS Which were stagnant and easy to cross in: 1905, crevassed and impassable in 1906, and stagnant and passable in 1909. Hubbard glacier, perhaps, began an advance in 1909 (see pages 16, 17, 19 and 22). noticed far to one side of the area of vigorous shaking. Just what is to be ex pected near the periphery of the area of maximum shaking we are not in a posi tion to predict, though it is to be expected that there, also, some response, probably less spectacular, should occur. In a single field season we could not, of course, cover an extensive area in personal field work, but we were able to do some work in the Prince William Sound region and in the Copper River Valley, and we made some observations on glaciers visible from the steamer and made inquiries regarding them. So far as we could learn from our in quiries none of the glaciers of the Inside Passage have undergone any notable transformation since 1899, excepting that of recession as exemDlified especially in the Muir glacier. The Brady glacier, near which our ship anchored for the night, has not changed notably since 1905, when we last saw it, and we could not detect any, changes in the great glaciers which descend the western face of the Fairweather Range, although it should be stated that most of these were seen from such a distance that we could have de tected only extensive changes. These glaciers, together with the Brady, Muir, and others in this vicinty, are within the area shaken during the September, 1899, earthquakes and may be expected to re spond, to some extent at least, to the effects of this shaking. The natives residing at Dry Bay, 60 miles southeast of Yakutat Bay, report that in the summer of 1909 there were re markable and long-continued changes in the volume of the Alsek River, which may be related to the advancing and breaking of some of the glaciers whose ends lie up this valley. We may expect advance in these glaciers, for their sources lie in the snow fields of moun tains within the area of vigorous shaking during the 1899 earthquakes.