76 The Causes and Phenomena of Earthquakes. 



was heard during a vibratory shock at Bulke, near Hanover. 

 " Noises like the explosion of cannon were heard " at Barga, in 

 Piedmont, during the earthquakes at Pignerol, on 8th April, 

 1808. 



" Three loud explosions " were heard at La Tour, on 9th May, 

 1808, and one on 14th of that month at the same place. 



At Angouleme, on 22nd August, 1817, a " loud detonation " 

 was heard at the termination of shocks. Similar " detonations " 

 preceded a shock at Motz, in Savoie, on 17th May, 1818. " A 

 noise like that of a distant cannonade " accompanied the shocks 

 felt at Aix la Chapelle, 4th and 5th November, 1818. At St. 

 Andrew's, in Lower Canada, on 15th July, 1819, a shock was 

 attended by " noise like the firing of cannon." The shock at 

 Barmouth, in Merionethshire, on 27th September, 1820, was 

 " accompanied by a noise like that of cannon." "A loud ex- 

 plosion " followed two severe shocks at Cherbourg on 16th June, 

 1 822 ; and " two loud reports " accompanied the violent shock at 

 Comrie, in Perthshire, on 13th April of that year. At Ancona, 

 on the 10th June, that year, " a loud explosive noise " was heard, 

 accompanying a shock. The earthquake at Karlstadt, in Sweden, 

 on 10th September that year, was "preceded by a noise like that 

 of a cannon." A noise " like that of a cannonade " attended 

 the shocks in Ceylon on 9th February, 1823. " Detonations " 

 were heard in Meleda isle, in the Adriatic, from 1822 to 1823 at 

 different times from March to November, and repeated in Feb- 

 ruary, 1825, accompanied by slight shocks. At Valentia, in 

 Spain, a noise "like that of a cannon," accompanied a very severe 

 shock ; and in New Brunswick, in North America, a severe shock 

 was " accompanied by an explosion like that of a piece of 

 ordnance," on 9th July, 1824. In Cuba, on 19th August, 1826, 

 three heavy shocks " ended with an explosion as of a large num- 

 ber of heavy pieces of artillery." At Ripon, in Yorkshire, on 

 9th February, 1827, " a tremendous explosion was heard" during 

 heavy shocks. " Loud explosions were heard on 8th July, that 

 year, at Petropaulovski, in Kamschatka, during shocks which 

 attended the eruption of TJrvatschimskaju, " violent detonations " 

 following the widely extended earthquake from S.E. to N."W. In 

 Columbia, in South America, on 16th November, 1827, they 

 occurred at " intervals of 30 seconds, with wonderful regularity." 



As these shocks occurred at 6 a.m., and as similar shocks took 

 place at Ockotzh in Eastern Siberia, at 9 next morning, which 

 was exactly the same time (allowing for longitude) it is believed 

 these shocks were the same, propagated through "the enormous 

 distance from Santa Fe. It is upwards of 8000 geographical 

 miles. 



In Suabia on 29th January, 1828, during a smart shock a heavy 

 noise " like a distant cannonade" was heard, and on 2nd Feb- 



