137 



The 1899 Earthquake. 



In September 1899 Alaska was disturbed by a series 

 of world-shaking earthquakes, [46, 47.] the greatest of which 

 are known to have been felt throughout 216,300 square 

 miles (560,600 sq. km.) on the land and which may have 

 been sensible in an area of a million and a half square miles 

 (3,880,000 sq. km.) The principal shocks came on Septem- 

 ber 3, 10, 15, 17, 23, 26, and 29. They were recorded by 

 all seismographs then in operation throughout the world. 



Most of these shocks were central in Yakutat bay. 

 They were felt with the greatest severity by seven pros- 

 pectors who were encamped close to a fault line in Russell 

 fiord near Variegated glacier, by the inhabitants of Yakut- 

 at village only 30 miles (48 km.) away, and by many others 

 in Alaska, Yukon and British Columbia. 



Excursion C 8. 



Barnacles and mussels attached to the ledges uplifted in the 1899 earthquake. 



During the second severe shock on September 10 

 there was renewed movement along old fault lines in the 

 Yakutat Bay region, resulting in the tilting of large fault 

 blocks and disturbance of the shorelines. The changes 



