388 L. MARTIN ALASKAN EARTHQUAKES OF 1899 



Earthquake of September 10, 1899—Shide No. 338 



Distance. 



Place. 



First phase. 



Second phase. 



Degrees. 



73.1 



Padua 



h m. 



21 53.1 

 53.1 

 53.0 



h. m. 



22 2.7 





Quarto 



22 2.3 



74.3 



22 9.8(?) 

 22 9.8(?) 

 22 2.7 



76.5 



Rome 



21 50.5 



76.5 



Rocca 



22 3.2 



77.7 



Ischia 



21 53.4 

 21 53.4 

 21 53.5 

 21 52.9 



22 3.6 

 22 3.4 

 22 3.5 



81.3 



Catania 



22 1.0 









"The resulting mean time for the first phase is about 21h. 53m.. and for the 

 second phase 22h. 3m., which give a corrected time of 21h. 39.5m., Green- 

 wich mean time, as the time of origin." 



ALASKAN TIME RECORDS 



The time records from Alaska which it is safe to use are from only 

 three localities (figure 4). This is because (a) there were onl}^ a few 

 persons in this wilderness area in September, 1899; (h) only a few of 

 these persons observed the times of the earthquake shocks accurately, and 

 (c) the timepieces of the few reliable observers were imperfect, the exact 

 position was not known, or the timepiece was not afterwards corrected to 

 given mean time of the local meridian. 



The first of the three most reliable time records comes from Mr. H. P. 

 Eitter, assistant, U. S. Coast and Geodetic Survey, who was at Cape 

 Whitshed, Alaska, 220 miles west of Yakutat. His readings were taken 

 with a good and well rated chronometer, giving mean local time of a 

 point whose exact latitude and longitude had been determined. The sec- 

 ond records were made by Judge W. G. Myers, local observer, TJ. S. 

 Weather Bureau, at Eagle, Alaska, 340 miles north of Yakutat. His 

 record is based upon local solar time. The third observations are by 

 Prof. J. C. Gwillim, of the Geological Survey of Canada, who was near 

 Atlin Lake, British Columbia, about 220 miles east of Yakutat. He had 

 determined his position and set his watch to solar time only 45 minutes 

 before one of the earthquakes. 



Other records, not quite so accurate, are by R. W. Beasley, at Yakutat ; 

 Lieut. W. C. Babcock, of the TJ. S. Army, in the Chugach Mountains; 

 Messrs. Brooks and Peters, of the U. S. Geological Survey, on the Tanana 



