Vol. 52.] SEISMIC PHENOMENA IN THE BRITISH EMPIEE. 



663 



Morocco is a stable region so far as the interior is concerned, but 

 it is unstable along the Mediterranean coast between Tangier and 

 Ceuta. 



Tunisia is stable, save along the coast of the Gulf of Gabes. 

 Utica was the scene of many disastrous earthquakes when under 

 Roman rule. 



If we may believe Livingstone, earthquakes are unknown on the 

 Upper Zambesi, at Victoria Falls, or in the hills through which runs 

 the tributary of the Kafue. The same explorer learnt at Tete, on 

 the Zambesi, that in the Maravis country, a short distance from 

 that town, slight shocks are frequently felt. 



On the Mozambique coast and at Senna slight shocks are fre- 

 quent, and all come from the east, which circumstance has caused 

 Perry to ascribe them to the active volcano of Reunion — a view 

 which the distance makes inadmissible, and moreover very few 

 earthquakes occur there. 



Lake Tanganyika, on the other hand, and the Upper Congo towards 

 Stanley Falls, may well include some important centre of seismic 

 movement. 



Earthquakes are rare at the Cape of Good Hope. A centre of 

 seismic movement possibly exists in Namaqualand, at Rehoboth, 

 where, according to Henderson, subterranean noises and slight 

 shocks are frequently observed. 



Despite the activity of the volcanoes of Mauritius, Reunion, and 

 the Comoro Group, earthquakes are of rare occurrence in those 

 islands. 



Of Madagascar little is known, in so far as seismic phenomena 

 are concerned, save that the eastern 

 slope is often more shaken than the 

 western. 



From St. Helena 8 shocks have 

 been recorded, and 2 from Tristan 



Fig. 5. 



Dacunha, but none from Ascension. 



§ 5. Dominion of Canada. 

 (Fig. 6, p. 664.) 



BR ITISH COLUMB IA 



Kilometrical Seismicity. 



VANCOUVER 



Vancouver Id. 66 Km. 



A good series of historical records 

 is available for the St. Lawrence 

 basin, New Brunswick, and Cape 

 Breton Island, colonies where earth- 

 quakes frequently occur. Moreover, 

 it is known that Newfoundland 

 and Labrador are very stable. 

 The Quadra Archipelago and 



Vancouver share in the instability of Washington Territory, and to 

 the two former the seismicity of the last named may be fairly 

 applied (^ = 118 kilom. ; £* = 58 kilom.). 



The Queen Charlotte group appears to be extremely unstable. 

 As to the vast level plains which stretch between Hudson Bay and the 

 Mackenzie River, and the islands of the Arctic Ocean, we are entitled 



