Page:Popular Science Monthly Volume 76.djvu/304

300 accompanied by faulting and by a 47 foot uplift of the coast six miles southwest of Hubbard Glacier, a 17 foot uplift 4 miles south of it, a 7 foot uplift four miles east of it, and a depression of the coast in some other places resulted in another sort of change. The prospectors encamped beside the Hubbard Glacier tell us of the great roar of avalanches during and after the shocks in 1899. In 1906 Professor Tarr found that several glaciers in this region had advanced a mile or more since we visited them the autumn before (Fig. 13). Only one had so advanced between 1899 and 1905. He has

shown this advance to be due to great avalanches which supplied abnormal quantities of snow to the heads of the glaciers during the earthquakes, resulting, after a delay of several years, in a spasmodic advance. The glacier shown on the map on the right and that on the left of Hubbard Glacier, advanced thus between 1905 and 1906 (Fig. 13). The Hubbard Glacier was unchanged in 1906. It may yet respond to a similar impulse imparted by this glacier flood and advance far into