390 



L. MARTIN — ^ALASKAN EARTHQUAKES OF 1899 



(not recorded at Cape Whitshed), originated at 7h. 15m., local time, at 

 Yakutat, or 16h. 33m. 12s., Greenwich mean time. 



The September 23d earthquake, observed at Cape Whitshed at Ih. 

 22m. a. m., originated at Yakutat at Ih. 45m. 28s., or llh. 3m. 40s., 

 Greenwich mean time. 



The September 26th earthquake, observed at Cape Whitshed at 2h. 

 49m. a. m., originated at Yakutat at 3h. 12m. 30s., or 12h. 40m. 42s., 

 Greenwich mean time. 



THE CORRECTED TIMES OF ORiaiN 



Date. 



Time at Yakutat Bay. 



Same in Greenwich mean time. 



September 3... 

 September 10 . . . 

 September 10. . . 

 September 15. . . 

 September 17 . . . 

 September 23 . . 

 September 26 . . 

 September 29. . . 



h. m. s. 



3 3 28 p. m 



7 43 18 a. m 



12 22 1 p. m 



7 15 a. m 



'. 1 45 28 a. m 



3 12 30 a. m 



6 21 40 (September 4. ) 

 17 1 30 

 21 40 13 

 16 33 12 



11 3 40 



12 40 42 



COMPARISON OF LOCAL TIME RECORDS AND 8EI8M0GRAPHIC TIME 



RECORDS 



A comparison of the local time records just quoted with those worked 

 out by Doctor Oldham (page 386) from the seismograph records follows, 

 showing the times of origin determined for inner Yakutat or Disen- 

 chantment Bay for the three chief shocks. All are given in Greenwich 

 and in local time. 



Septemher 3d Earthquake 

 p. M. A. M., Sept. 4. 



Local record.— 3h. 3m, 28s., local solar time; or Oh. 21m. 40s., Greenwich mean 

 time. 



Seismograph record.— 3h. 2m. 18s., local solar time; or Oh. 20m. 30s., Greenwich 

 mean time. 



September 10th Earthquake {the early shock) 



A. M. 



Local record.— 7h. 40m. Os., local solar time; or 16h. 58m. 12s., Greenwich mean 

 time. 



Seismograph record.— 7h. 43m. 18s., local solar time; or 17h. Im. 30s. Greenwich 

 mean time. 



September 10th Earthquake {the great Earthquake) 



Local record. —12h. 22m. Is., local solar time; or 21h. 40m. 13s., Greenwich 

 mean time. 



Seismograph record.— 12h. 21m. 18s., local solar time ; or 21h. 39m. 30s., Green- 

 wich mean time. 



