﻿RATE 
  OF 
  PROPAGATION. 
  79 
  

  

  In 
  each 
  case 
  higher 
  and 
  lower 
  accelerations 
  have 
  been 
  obtained, 
  some 
  of 
  

   which 
  have 
  been 
  rejected 
  for 
  reasons 
  given 
  in 
  Appendix 
  C. 
  Others 
  

   represent 
  real 
  but 
  local 
  variations 
  in 
  the 
  rate 
  of 
  acceleration, 
  which 
  

   is 
  known 
  to 
  vary 
  within 
  wide 
  limits 
  even 
  in 
  closely 
  adjacent 
  spots. 
  

   The 
  values 
  given 
  are 
  what 
  appear 
  to 
  be 
  fair 
  average 
  ones 
  for 
  the 
  

   whole 
  station. 
  

  

  Comparing 
  these 
  results 
  it 
  will 
  be 
  seen 
  that 
  the 
  violence 
  of 
  the 
  

   shock 
  was 
  practically 
  the 
  same 
  at 
  Shillong, 
  Gauhati 
  and 
  Sylhet, 
  1 
  

   somewhat 
  more 
  at 
  Goalpara 
  and 
  less 
  at 
  Dhubri, 
  while 
  at 
  Silchar, 
  it 
  

   was 
  decidedly 
  less. 
  It 
  is 
  to 
  be 
  regretted 
  that 
  no 
  numerical 
  value 
  

   can 
  be 
  given 
  for 
  the 
  violence 
  of 
  the 
  shock 
  at 
  Rangpur 
  or 
  Kuch 
  

   Bihar. 
  

  

  At 
  Cherrapunji 
  the 
  shock 
  would 
  appear 
  from 
  the 
  figures 
  to 
  have 
  

   been 
  slightly 
  less 
  violent 
  than 
  at 
  Shillong, 
  but 
  it 
  was 
  quite 
  as 
  de- 
  

   structive, 
  the 
  lesser 
  acceleration 
  being 
  apparently 
  made 
  up 
  for 
  by 
  

   the 
  greater 
  range 
  of 
  movement. 
  

  

  In 
  the 
  foregoing 
  passage 
  reference 
  has 
  only 
  been 
  made 
  to 
  the 
  

   acceleration 
  in 
  a 
  horizontal 
  direction, 
  as 
  deduced 
  from 
  the 
  formula 
  

   in 
  common 
  use. 
  This 
  has 
  been 
  employed 
  as 
  it 
  is 
  the 
  only 
  one 
  

   available, 
  though 
  it 
  seems 
  certain 
  that 
  no 
  great 
  value 
  can 
  be 
  attached 
  

   to 
  the 
  results 
  where, 
  as 
  in 
  the 
  present 
  case, 
  there 
  was 
  a 
  large 
  vertical 
  

   component 
  in 
  the 
  motion. 
  At 
  Shillong, 
  Gauhati, 
  and 
  throughout 
  the 
  

   epicentral 
  tract, 
  stones 
  have 
  been 
  projected 
  upwards, 
  as 
  described 
  in 
  

   Chapter 
  IX, 
  and 
  this 
  fact 
  shows 
  that 
  the 
  acceleration 
  in 
  an 
  upward 
  

   direction 
  must 
  have 
  been 
  greater 
  than 
  that 
  of 
  gravity, 
  that 
  is 
  to 
  say 
  

   more 
  than 
  32 
  feet 
  per 
  second 
  per 
  second. 
  How 
  much 
  greater 
  it 
  is 
  

   impossible 
  to 
  say 
  but 
  in 
  places 
  it 
  may 
  have 
  been 
  four 
  or 
  five 
  

   times 
  as 
  great. 
  

  

  Put 
  into 
  simple 
  language 
  this 
  means 
  that 
  the 
  measured 
  violence 
  

  

  1 
  It 
  must 
  be 
  noticed 
  that 
  the 
  violence, 
  or 
  power 
  of 
  destruction, 
  is 
  not 
  the 
  same 
  as 
  the 
  

   desti 
  uctiveness, 
  or 
  destruction 
  actually 
  caused, 
  and 
  this 
  is 
  especially 
  true 
  where, 
  as 
  is 
  generally 
  

   the 
  case, 
  the 
  terms 
  are 
  used 
  solely 
  with 
  regard 
  to 
  the 
  effects 
  produced 
  on 
  buildings. 
  Here 
  many 
  

   other 
  considerations 
  come 
  into 
  consideration 
  besides 
  the 
  violence 
  of 
  the 
  shock. 
  

  

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  79) 
  

  

  