AREA AFFECTED 



343 



400,000 to 500,000 square miles, while distant observations suggest that 

 the shocks may have been sensible over 1,539,000 square miles. The re- 

 liable time records, aside from seismograms, are meager but decisive. 

 The shocks were tectonic and attendant upon renewed earth movement 

 accompanying mountain growth. 



LOCATION OF AREA 



These earthquakes seem to have originated in or near Yakutat Bay, 

 which lies close to the bend of the Saint Elias-Chugach coast range, near 



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Figure 2. — Ma/> of Alaska {after Brooks) 

 Showing relation of mountain axes to earthqualie origin in Yakutat Bay 



latitude 140 degrees west and longitude 60 degrees north. Figure 2 

 shows the general location of the Yakutat Bay region as well as the 

 mountain axes in Alaska to which these shocks are related. The Chugach 

 Mountains average 6,000 to 7,000 feet in height, the Saint Elias Eange 

 10,000 to 19,000 feet. 



Among the Alaskan towns existing in 1899 Skagway lies 150 miles 

 east of Yakutat Bay, Juneau and Sitka between 200 and 250 miles south- 

 east, and Valdez 250 miles northwest. Glacier Bay is 150 miles east of 

 Yakutat Bay. The Wrangell Mountains, including Mount Wrangell 

 and other active volcanoes, extend parellel to the Saint Elias Eange and 



