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220 



Se< 



EARTHQUAKE PHENOMENA. 



[Sect. VIL 



C5 



allies, or other indications of the distant or 



of disturbance* 



The secondary effects of the great sea-wave most worthy 

 of remark are the materials, if any, carried in from deep 

 sea, such as loose niineral matter, new animal or vegetable 

 forms. Unless the water is very deep close to land this 

 is unlikely to occur^ as the range of transferring power of 

 a great sea-wave (wave of translation) is only equal to 

 the length of the wave itself. ■ 



If fish or testacea are thrown inland into fresh water, 

 the effects on them should be noticed. 



In recording the transporting power of the wave (?'. e. 

 its absolute transferring power, without reference to dis- 



tance), the size, form, specific gravity, and lithological 

 character of rocks or boulders moved, the distance moved, 

 and height lifted are to be given. The base on which 

 moved, if rock, the scratches or farrows produced. The 

 mode of motion ; if swept or roiled along. Obstacles 



overcome in their progress. Whe 

 materials are moved. 



gravel 



or 



loose 



^ an estimate of the mass moved, and 

 to what distance ; the character, external and internal, 

 of its deposition ; the mutual relations of its fine and 

 coarse parts. The eflPects on buildings variously exposed ; 

 on vertical and sloping sea-walls ; on steep faces of clifTs. 

 The denuding effects of the wave in sweeping off sand, 

 gravel, trees, animals, &c. The disruption and abrasion 

 of stratified rocks, especially of nearly level and nearly 

 vertical beds. Effects of vertical sea-walis or cliffs in the 

 reflection or extinction of the wave. 



Specimens should be taken of the rock of which very 

 rcTiiarkable boulders or architectural fragments moved by 



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