FIRST EARTHQUAKE OF SEPTEMBER TENTH 



355 



100 miles west of Yakutat, suggest that the origin of this first shock 

 might have been there. The nearness of Yakataga to the center of dis- 

 turbance (figure 3) is not regarded as significant, since the centrum theory 

 of earthquakes has been seriously questioned in recent years. More im- 

 portant is the fact that the prospectors in Disenchantment Bay seem to 

 describe this shock as less severe than in the Chugach Mountains, etcetera, 

 although we may be reading this interpretation into their accounts or they 

 may have experienced such severe shocks afterwards (September 10) 

 that the first shock seemed slight to them in contrast. The greater in- 

 tensity at Yakutat Village than in Disenchantment Bay is doubtless due 

 to the loose, unconsolidated rocks at the former place on Yakutat fore- 

 land, where shocks would be more severe than among the metamorphosed 

 rocks of the mountains in Disenchantment Bay. The time records are 

 not conclusive on this question, but the Yakataga origin is quite as pos- 

 sible as that at Yakutat. 



After-sliocl's of the September 3d earthquake. — Light shocks between 

 September 3d and 9th are recorded by Mr. Fults in Disenchantment Bay, 

 Mr. Hill at Yakutat, Mr. Eitter at Cape Whitshed, and others, but no 

 dates or times were recorded. 



FIRST EARTHQUAKE ON SEPTEMBER 10, 1899 



List of localities. — On Sunday, September 10, the first heavy shock oc- 

 curred about twenty minutes of eight in the moming.^° So far as known, 

 it was recorded at the following places; the list is doubtless incomplete, 

 because of the overshadowing violence of the second shock on this day : 



Places. 



Location with respect to 

 Yakutat Bay. 



Observers. 



Disenchantment Bay . . . 

 Yakutat Village. 



In Yakutat Bay 



Mouth of Yakutat Bay .... 



220 miles west-northwest. 



240 miles northwest 



250 miles west-northwest. 

 90 miles east 



J. Bullman, L. A. Cox, A. 

 Flenner, J. D. Fults, Jr., 

 A. Johnson, T. Smith, 

 and D Stevens. 



C E Hill E W Beaslev 



Copper Eiver delta 



Chugach Mountains 



Valdez 



Albin Johnson, and 



others. 

 H. P Eitter, E. B. Latham, 



and others. 

 W. C. Babcock. 

 L S. Camicia. 



Upper Alsek Eiver 



Upper Yukon Eiver 



Skagway 



A E A eland 



190 miles northeast 



160 miles east-southeast. . . 

 220 miles southeast 



Northwest mounted police. 

 B. F. Shelton and others. 



Juneau 



H. H. Folsom and others. 



30 Assuming an origin in Yakutat Bay, this began at 7h. 43m. 13s. (17h. Im. 30s., 

 Greenwich mean time), if based on distant seismograph records. Mr. Beasley's time 

 record at Yaliutat (7.40) agrees closely with this. 



