On Scales of Seismic Intensity. 45 



were of course, inapplicable for use in other districts and by 

 other observers. 



(2) Mallet Scale. — ' The Great Neapolitan Earthquake of 



1857/ vol. ii. 1802, pp. 253-256. 



Mallet's celebrated study of the Neapolitan earthquake of 

 1857 was founded for the most part on observations made 

 within and near the epicentral region, and consequently the 

 scale proposed by him is one that is chiefly applicable to 

 destructive earthquakes. It is given twice in the work 

 above-mentioned (pp. 253 & 255), and the two accounts of 

 it do not exactly agree. I have endeavoured to combine both 

 in the following table. 



5. The shock perceived by instrumental disturbance. 



4. The shock distinctly perceived by the unaided senses, 

 and producing more or less alarm. 



3. Universal production of fissures, and slight dislodgments 

 in buildings ; little or no loss of life. 



2. Large portions of cities and towns thrown down, 

 persons killed and wounded by their fall. 



1. The greater part of cities and towns perfectly prostrated ; 

 great loss of life. 



(3) Philippine Scale. — P. Miguel Saderra Maso, ' La 



Seismologia en Filipinas' (Manila, 1895), p. 21. 

 Father Saderra Maso's scale, which has been in use since 

 1870, is well adapted for a country which is not thickly 

 populated. The adjectives alone might not convey a very 

 accurate impression of the intensity of the earthquakes 

 described in the valuable memoir referred to above ; but the 

 equivalent degrees of the llossi-Forel scale are appended to 

 each. These will be found in the table at the end of this 

 paper. 



1. Perceptible. 



2. Slight. 



3. Ordinary. 



4. Strong. 



5. Violent. 



6. Destructive. 



(4) Eossi Scale.— Ball, del Vulc. Ital., Anno IV. 1877, 



pp. 39-40. 

 The scale drawn up in 1873 * by the late Prof. M. S. de 

 Eossi, the well-known Italian seismologist, is a great step in 



* The first form of the scale with which I am acquainted is contained 

 in an earlier volume of the journal above-mentioned ; it was slightly 

 modified in successive years. See Anno I. 1874, p. i ; Anno IT. 1875, 

 p. iii ; Anno III. 1876, p. i. 



