SEISMOLOGICAL COMMITTEE. 



61 



The tremors with large amplitudes, viz., those which caused the 

 horizontal pendulum of the seismograph to swing at least 5 mm. on 

 each side of the zero line, were : — 



Remarks. 



Epicentrum. 



11,200 km 

 5,000 „ 

 5,600 „ 



11,000 „ 

 5,400 ., 

 7,800 „ 



Displacement value, 1 m/n. -0*25. 



Note. — All times used in these Observations are Greenwich mean 

 civil time, h. or 24 h. — midnight. 



For a complete record of the tremors recorded on the Sydney 

 Observatory seismograph, see the Seismological Bulletins of the 

 British Association for the Advancement of Science. All tremors have 

 been measured and tabulated and forwarded to the above Society for 

 publication. 



RivERviEw College Observatory, Sydney. 

 E. F. Pigot, S.J., Observer. 



Since the last Report two years ago the three seismometers 

 here have continued the uninterrupted records already secured, many 

 very interesting seismograms having been obtained. Some of these 

 have thrown further light, it is hoped, on the exact nature of the 

 processes going on in certain spots in the bed of the S.AV. Pacifio, not 

 very far from Australia, where intense folding, with occasional faulting, 

 is in progress. Others, especially the great Dardanelles earthquake 

 of 9th August last, had a special and sad interest attaching to them 

 from the large loss of life involved. 



During the year 1911, IM earthquakes were recorded, and during 

 the year 1912, 133 earthquakes were recorded (up to date 26th 

 December). 



The following were speciallv remarkable : — • 

 1911. 

 Januarv 3 . . . . Turkestan. 



Februarv 18 

 May 14 ' 

 June 7 

 July 11 

 August 16 



India (Lahore). 



Kamschatka. 



Mexico. 



Near Ladrone Islands. 



