ABSTRACT
Department of Civil Engineering, The University, Newcastle upon Tyne, UK
1 3 . 1 I N T R O D U C T I O N
T h e r e a r e e s s e n t i a l l y t w o t y p e s o f v i b r a t i o n t o w h i c h p i l e s m a y b e s u b - j e c t e d i n t h e l i f e - t i m e o f t h e f o u n d a t i o n . T h e t w o t y p e s o f v i b r a t i o n c a n b e c l e a r l y s e p a r a t e d b y c o n s i d e r a t i o n o f t h e m a g n i t u d e o f e n e r g y i n v o l v e d .
