88 



EARTHQUAKES. 



Occasion and Place 



Approx. 



rate in 

 feet per 



second 



Eormation constituting Range 



on surface as far as known or 



conjectured 



Authority 



Eev. John Mitchell's 

 guesses from the 

 Lisbon earthquakes 



Von Humboldt's 

 guesses from South 

 America 



Lishon Earthquake 

 0/1761. 



Lisbon to Corunna 

 Lisbon to Cork 



Lisbon to Santa Cruz 



Antilles. 



Points ^ Pitre to 

 Cayenne (doubtful) 



Cutch 

 1819 



India. 



to Calcutta, 



India, Nepauls, and 

 basin of the Gcanges, 

 1834:— 

 Rungpur to Arrah 

 Monghyr to Gorack- 



pur 



Rungpur to Monghyr 



Rungpur to Calcutta 



Ships ' Rambler ' and 



' Millwood,' at sea, 



1851 ; between lat. 



16° 30' N.L., 54° 30' 



W., and lat. 23° 30' 



N.L., 68° 0' W. 



1,760 



1,760 



to 

 2,464 



1,994 

 5,228 



3,261 

 6,586 



1,173 



2,31 4 \ 

 3,520 



9C0 

 1,210^ 

 1,056 



Sea bottom, probably on 

 slates, secondary and 

 crystalline rocks 



From observations in va- 

 rious South American 

 rocks in great part vol- 

 canic 



Transition, carboniferous 



and granitoid 

 Transition, carboniferous 



crystalline slates and 



granitoid, probably, 



under sea bottom 

 The same with many 



alterations 



Probably volcanic rocks 

 under sea bottom 



Alluvial, secondary, grani- 

 toid and later igneous 

 rocks 



Deep alluvia, with occa- 

 sional transition, car- 

 boniferous, granitoid, 

 and later igneous rocks 



Sea bottom resting on 

 unknown rock 



Mitchell 



Humboldt 



* Annual 

 Register 



Stier and 

 Perrey's me- 

 morandum, 

 Dijon 



* Royal 



Asiatic 

 Journal ' 



' Royal 

 Asiatic 

 Journal ' 



' Nautical 

 Magazine ' 



