REPORT OF THE DIRECTOR IQII 



41 



RECORD OF EARTHQUAKES AT ALBANY STATION, OCTOBER I, I9IO TO 



SEPTEMBER 30, I9II 



Standard time 



DATE 



Beginning 

 preliminaries 



Beginning 

 principal part 



Maximum 



End 



Max' mum 

 ampli- 

 tude 



1910 



November 6 



November 26 



December 10 



December 13 



December 16 



1911 

 January 3 



H M 



3 43 P. M. 

 12 01 A. M. 



4 52 A. M. 

 7 05 A. M. 

 9 47 A. M. 



6 43 p. M. 



6 48 p. M. 

 10 40 p. M. 

 12 06 A. M. 



H M 

 3 51 P.M. 

 12 41 A.M. 



5 24 A. M. 

 7 33 A. M. 



to 22 A. M. 



7 03 P. M. 



6 57 P- M. 



11 04 P. M. 



12 25 A. M. 



H M 

 3 52 P. M. 

 12 47 A. M. 



5 35 A. M. 



7 40 A. M. 



II 00 A.M. 



7 18 P. M. 



H M 



4 50 P. M. 



2 58 A. M. 



7 30 A. M. 



9 IS A. M. 

 12 20 P. M. 



9 IS p. M. 



7 39 P. M. 



12 08 A. M. 



I t A. M. 



mm 

 12 

 10 



5 

 10 



5 



120 



May 4 



A 



September 16 



September 22 



11 07 P. M. 



12 26 A. M. 



s 



3 



November 6th, Apparently from a source within 3000 miles of 

 Albany. North-south component most distinct. 



November 26th. A microseismic tracing, very prolonged in its 

 preliminary phase. May be a compound record, without definite 

 relation between the phases. 



December loth. The record of a long-distance quake, probably 

 7000 or 8000 miles away. North-south component very weak. 



December i^th. The beginning was probably earlier than the 

 time given ; no definite break existed between the first discernible 

 tremors and the usual line. 



December i6th. Only the east-west component represented. The 

 record gives uncertain readings, perhaps from conflicting disturb- 

 ances. 



January ^d. The heaviest quake of the year, and comparable 

 in its tracing to any of the shocks hitherto recorded. The east-west 

 component was alone received, owing to a temporary stoppage of 

 the second pendulum for repair. The center of the disturbance was 

 in Russian Turkestan where it inflicted considerable damage and 

 loss of life. 



May 4th. Faint tremors showing no division between the pre- 

 liminaries and principal part. 



September 16th. A characteristic tracing of a small and distant 

 shock. 



September 22d. Appears to have originated in vicinity of Prince 

 William sound, Alaska. 



MINERALOGY 



In pursuance of the investigation of the recent mineral occurrences 

 of New York City, specimens from four localities have been studied 

 in some detail, furnishing material for several short papers appearing 



