198 



KEPORT — 1898, 



Observations at the li. Osservatorio di Catania e delV Etna. 

 By Dr. A. Eiccb. 1897-1898. 



Instrument a long pendulum, p. 259. 



Date 



Mar. 23 



"^4 



June 3 



.. 12 



July 21 

 Au 



22 

 2 

 5 



Sept. 17 



„ 20 



,. 21 



Oct. 2 



„ 19 



„ 20 



Dec. 11 



„ 29 



Jan. 29 



Commence- 



raenf 



G.M.T. 



H. M. 



13 20 

 51 



s. 

 6 

 46 



9 53 42 

 11 17 22 



13 39 4 



9 4 53 



15 17 



24 35 



15 15 50 



19 25 2 



5 29 32 



13 31 51 



6 36 



14 49 26 

 9 51 28 



11 29 10 



14 4 41 



Eemarks 



Small 



Small. Also Ih. Om. 2s. and Ih. 5m. 49s. 



„ Duration Ih. 35m. 37s. 

 Very large. Duration 4h. 51m. 38s. 



Max. range 32mm. Period of large 



waves lis. 

 Moderate. P.Ts. Im. 23s. Duration 



Ih. 15m. 29s. 

 Small. Exact commencement lost 



Moderate. P.Ts. 10m. 29s. Duration 

 2h. 40m. 53s. 



Small. Duration 2h. 36m. 47s. 



„ Period of large waves ll'5s. 

 Duration 2h. 10m. 45s. 



Small 



Small. Period of large waves lis. Du- 

 ration 32m. lis. 



Small. Period of large waves 12s. Du- 

 ration 52m. 42s. 



Small 



Small. P.Ts. 14m. 21s. Duration Ih. 

 20m. 54s. 



Small. Period of large waves 23s. Du- 

 ration Ih. 30m. 50s. 



Large. P.Ts. Ih. 2m. 19s. Eange 18 mm. 

 Duration Ih. 33m. 51s. 



Deductions based on the Preceding Records. 



In order to determine the areas over which each of the earthquakes 

 recorded at Shide had been perceptible a list of these (see p. 191) was 

 sent to observatories at the following places : — 



Edinburgh,* Bidstone,* Strassburg, Padua, Rome,* Rocca di Papa,* 

 Catania,* Ischia, Nicolaiew,* Charkow, Potsdam,* Toronto.* 



Replies have been received from those stations marked with an asterisk. 

 Dr. P. Tacchini, Director of the Ufficio Centrale di Meteorologia e di 

 Geodinamica at Rome, in replying, called my attention to several earth- 

 quakes which hud been well recorded in Italy, but which did not appear 

 on my list. A re-examination of my seismograms led to the discovery of 

 certain of these, and the numbers on the Shide list were increased from 

 160 to 169. 



Records which ought to be strictly comparable are those from Shide, 

 Toronto, and other stations at which the free horizontal pendulums adopted 

 by this committee have been established. 



The records from Strassburg, Nicolaiew, Potsdam, and from stations 

 at which there are free horizontal pendulums of the von Rebeur-Paschwitz 

 or Ehlert types, provided that these instruments have been adjusted with 

 like degrees of sensibility, should also be comparable amongst themselves. 



