510 Proceedings of the Royal Irish Academy. 



This line is very distinctly marked, and may be considered as the axis 

 of a zone or band -vvhich "would include the eastern portion of Spain, 

 the western half of France, Great Britain and Ireland, the Faroe 

 Islands, and Iceland. 



IX. — Tlie Almeria or Murcia Earthquahe District maybe considered 

 as correlated with this line by the angle of 70°. It has a well-marked 

 direction, and its extension eastwards represents the coast-lines of 

 Iviza and Majorca, crosses the northern part of Corsica, touches Elba, 

 and traverses Italy from Piombino by Sienna Arezzo and Urbino — 

 points well marked by repeated earthquake movements. 



X. — South-east Coast of the Adriatic (^Allesio to Aolona). — This 

 line, of no great extent, yet well marked as regards earthquake move- 

 ments, is interesting from the fact that its parallel, lying between 

 Bosnia-Serai and Eagusa, has been cited as a line along which simul- 

 taneous earthquake action has taken place (June 27, 1869). Now, 

 this line may be considered as making with the coast-line, north-east 

 of the Persian Gulf (JS'o. 32) an angle of 80°, and produced defines cor- 

 rectly the line of the Danube between ^^aitzen and Essek, along 

 which shocks have been cited as having occurred, parallel to which 

 there is a very distinctly marked line of earthquake action represented 

 by a series of points between Kesskemet and Petervasara in Hungary. 



As regards the coast-lines, properly so called, certain of them are 

 well marked by the frequency of earthquakes and succession of the 

 points at which they have been noted. This is the case as regards the 

 west coast of Portugal, the north coast of Africa, the Syrian coast, the 

 Adriatic coasts, the western coast of Asia Minor, the north-east coast 

 of the Black Sea, the southern coast of same between Samsun and 

 Trebizonde. The northern or Cantabrian coast of Spain, so markedly 

 rectilinear and so well defined by the great circle, N"o. 66 (south-west 

 coast of Australia), is not cited as having presented remarkable earth- 

 quake movements ; yet the few localities cited in this respect are 

 upon this great circle. Taking into consideration only those more 

 remarkable coast-line directions, their parallels, and certain lines cor- 

 related therewith, it may be advanced that they furnish sufficient 

 evidence to justify the proposition, that between certain of these coast- 

 line directions and locaKties in Europe markedly characterized by the 

 frequency and intensity of their earthquakes, there exists a very dis- 

 tinct relation of direction, and that this relation would be much more 

 distinct were our earthquake records more complete, and if they had 

 extended over a greater period of time than that corresponding to our 

 chronology, a period so comparatively short so far as geognostical fac- 

 tors are concerned. 



Many minor proofs of parallelism and correlation might be pointed 

 out, and may be easily gathered from the examination of a map. 



