EARTHQUAKE MOTION TO GREAT DISTANCES. 



and detailed accounts of earthquakes, both sensible and insensible, recorded in Italy, 

 which are regularly published through the enlightened liberality of the Italian 

 Government. Detailed descriptions of the records of most of the more important 

 seismographs established in Italy have been printed, at first in the Bolkttino of the 

 Central Meteorological Office in Rome, and afterwards in that of the Italian Seismo- 

 logical Society. From these I have extracted the times of ( 1 ) the commencement of 

 the record, (2) of any marked sudden increase of movement, and (3) of any change 

 in its character, so far as these are mentioned ; the results, in the case of the seven 

 earthquakes which satisfy the conditions laid down, are given below. 



Details of the Data. 



1. JAPAN, March 22, 1894. 



This earthquake has been made the subject of a special study by the late E. VON 

 REBEUR PASCHWITZ,* by whom the three-phase character of the record was recognised. 

 The origin is placed by Professor MILNE as in about N. lat. 43, E. long. 146. The 

 time was recorded at Tokio, by the Gray -Milne seismograph, at 10 h 27 'S^t and the 

 distance from the epicentre being about 950 kiloms., the time at the epicentre, reckoning 

 the rate of propagation as 3 kiloms. per second, would be 10 1 ' 22 'S. As the records 

 are detailed in the paper referred to, it will be unnecessary to reproduce the descrip- 

 tions, and they may be tabulated at once, the times being minutes after 10' 1 . 



The times at Padua (40 1U ) Grenoble (397 m ) and Mineo (42-5 ni ) appear to represent 

 the maximum of the first phase, registered at Rome about 40, rather than the 

 commencement. Besides this the Charkow and Nicolaiew pendula registered an earlier 

 shock, presumably from the same centre, with an origin at 5 h 24. The times in 

 minutes after 5 h are 



* 'Petermnnn's Mittheilungen,' 1895, pp. 14-21. 

 t All times are Greenwich Mean Time. 

 T 2 



