EARTHQUAKE MOTION DEDUCED FROM OBSERVATION. 89 



The Lisbon Earthquake of Novembee 1, 1755. 



Presumed focus of shock, 

 lat. 30°, long. 11° W. 



A ship at sea in lat. 38 

 long. 10° 47' W. 



Colares 



Lisbon . • 



Oporto . • 



Aj^amonte 



Cadiz 



Tangier and Tetuan 



Madrid 



Funchal . 



Portsmouth , 



Havre . • 



Reading . , 



Yarmouth . , 



Amsterdam 



Loch Ness 



Moment ob- 

 served of shock 



h. m. 

 9 23 



9 24 



9 30 



9 32 



9 38 



9 50 



9 4-8 



9 46 



9 43 



10 1 



10 3 



10 23 



10 27 



10 42 



10 6 



10 42 



Distance from 

 presumed origin 



30 



30 



30 



30 











30 







8 30 



12 30 



13 

 13 30 



Velocitj- in feet 

 per second 



3,091 



1,325 

 1,030 

 1,030 

 916 

 1,236 

 1,478 

 1,855 

 1,382 

 1,431 

 1,339 

 1,304 

 1,174 

 2,444 

 1,409 



The Lisbon Earthquake of 



March 



31, 1761.» 



Locality- 



Moment ob- 



Distance from 



Velocity in feet 



served of shock 



presumed origin 



per second 



Presumed focus, lat. 43°, 



h. m. 

 1 11 51 



o 



' 





long. 11° W. 



"~ 



~ 





Ship at sea in lat. 43°, 



1 









many leagues from coast 



J. 11 52 







30 



3,091 



of Portugal 



J 









Ship in lat. 44° and about 

 80 leagues from coast ■ 



I 11 54 



1 



45 



3,607 



Corunna .... 



11 51 



2 



30 



2,576 



Ship lat. 44° 8' and 80 



1 









leagues NNW. of Cape 



y 11 58 



3 



30 



3,091 



Fioisterre 



j 









Lisbon .... 



noon 



4 



30 



3,091 



Madeira .... 



12 6 



10 







4,122 



Cork 



12 11 



9 



30 



2,937 



English miles each, and the time is reduced to lisbon 

 time. 



These tables, owing to the nature of the materials 

 ' See Rejjort of Britisli Association, 1858, p. 10. 



