EARTHQFAKK MOTION TO CKKAT IHsTAXCKR. 



I 4:5 



place of origin as 10 h 31 m on 15th June, at about 120 geographical miles east of 

 Migako, or in about N. lat. 39 30', E. long. 144 30'. 



The following abstract of the records is taken from ' Boll. Soc. Sismol. Ital.,' 

 vol. 2, Part II. 



Padua. Commencement of rapid vibrations at 10 h 46 57', which terminate at 

 1 l h 4 m 27* ; at 1 l h 17" 17* the first groups of slow undulations, period 40', commences ; 

 record ends at 12 h 58 1". 



Rocca di Papa. 10 h 5G m 18' commencement of barely perceptible tremors on the 

 N. S. component of the grande sismom ; at ll h 20 m commencement of undulations of 

 18* period, which reach a maximum of II' 1 23 m 15 1 , and end at about 12 1 ' 30. On 

 the E. W. component the tremors begin at 10' 1 57 m , and the long waves at 1 1 1 ' 1 7" 48", 

 maximum at ll h 23" 1 10 , and end at 12' 1 30 m . 



Rome. On the sismom. medio undulations began at ll h 19 20' and end about 

 ll h 32 30'. The grande sismom. shows a commencement at ll b 21 m 50 1 , maximum 

 ll h 28 m 25', end ll h 47" 15',aU on the N.E. S.W. component. The other component 

 shows a commencement at ll h 19 m 55*, maximum at ll h 23 m 5', end at ll h 49 m 20'. 



Ischia. 10 h 50 29', commencement of record on horizontal pendula (according to 

 ' Brit. Assoc. Report,' 1897, p. 170, the time was 10 h 49 50') at 10 h 57 m 21' the move- 

 ment, which had been minute, became appreciable; at ll h 6 m 10* the period of the 

 undulations increased, and the great undulations commenced at 1 l h 22 m , end at 12 1 ' 30 m . 



Catania. The account is very meagre, but in the ' Atti. Ace. Gioenia di Sci. Nat.,' 

 ser. 4, vol. 1 0, the following details of the record are given. Commencement I O 1 ' 47 m 1 2* ; 

 commencement of waves of about 24' period ll h 9 m , maximum Il h 29 m 15", end 14 h 2 m . 



At Shide the horizontal pendulum is reported to have commenced its record at 

 10 h 30"', and at Nicolaiew the maximum was at 10 h ('Brit. Assoc. Report,' 1897, 

 pp. 149, 167), these times being in advance of the time of origin of the shock. 



Classifying these, we get the following times in minutes after 10 h A.M. 



The time of commencement of the first phase at Ischia, 10 h 49'8 m , is evidently late 



