SEISMOGRAPH RECORDS 379 



a Observed at Yakutat Village by R. W. Beasley. Irregularly regulated "sun 

 time" of local meridian, 



b Observed in Coast Survey camp by H. P. Ritter, with good and well rated 

 chronometer, using solar time of local meridian. 



(*) No time record. 



c The early shock. 



d The great earthquake. 



e Not recorded at Cape Whitshed. Shocks were felt between September 12 

 and 16, but not precisely recorded because of general uproar of storm then 

 raging. This September 15th shock was felt with great intensity at Yakutat, 

 as well as at Skagway. 



f If observed at Yakutat or Cape Whitshed the shock was not recorded. 

 Indefinite statement of observation at Skagway and Juneau. 



No time record is available for the possible initial shock on August 27, 

 1899, but there seems to have been no great shock recorded by seismo- 

 graphs that day. All the seismograph records, so far as known to the 

 writer, show world-shaking earthquakes on September 3, twice on Sep- 

 tember 10 and September 23 at most of the observatories where instru- 

 ments were then installed (figure 8). 



There seems to have been no seismograph record of the September 15th 

 shock, although reported as severe at Yakutat, Skagway, etcetera. 



The September 17th shock, though widely recorded by seismographs, 

 was not felt at Yakutat or Cape Whitshed. Its observation at Skagway 

 and Juneau is indefinite. Professor Milne has computed, however, that 

 this shock was in Alaska.^^ Its origin was probably not in Yakutat Bay. 



The shock of September 23 was recorded throughout the world, the 

 record having an amplitude of 17 millimeters at Victoria and then going 

 clear off the paper. 



The shock of September 26 was recorded throughout the world, but 

 was less violent than that of the 23d. Its amplitude was 7.4 millimeters 

 at Victoria and 4.1 millimeters at Toronto. 



The shock of September 29, the final one of the series, happens to coin- 

 cide in date with the Ceram earthquake in the East Indies. The Vic- 

 toria seismogram, with an amplitude of 2.5 millimeters, might possibly 

 belong to the Alaskan series, but the exact time of the shock felt in the 

 night at Cape Whitshed is not available for determining this conclu- 

 sively. 



TABLES OF SEISMOGRAPHIC DATA 



The following three tables include some of the available data showing 

 the orderly and progressive time, duration, and intensity as the tremors 



p' Nature, vol. Ix, 1899, p. 545. 



