﻿160 
  OLDHAM: 
  GREAT 
  EARTHQUAKE 
  OF 
  1897. 
  

  

  Reviewing 
  the 
  facts 
  collected, 
  we 
  see 
  that 
  the 
  permanent 
  change 
  

   accompanying 
  the 
  earthquake 
  are 
  not 
  confined 
  to 
  one 
  spot 
  or 
  one 
  

   line, 
  but 
  extend 
  over 
  the 
  northern 
  part 
  of 
  the 
  Assam 
  hills 
  for 
  a 
  dis- 
  

   tance 
  of 
  100 
  miles 
  from 
  east 
  to 
  west. 
  Another 
  point 
  to 
  notice 
  is 
  

   that, 
  at 
  the 
  limits 
  of 
  this 
  area 
  the 
  evidence 
  points 
  to 
  the 
  changes 
  being 
  

   of 
  the 
  nature 
  of 
  long, 
  low 
  rolls, 
  the 
  change 
  of 
  slope 
  being 
  insufficient 
  

   to 
  cause 
  any 
  appreciable 
  change 
  in 
  the 
  drainage 
  channels. 
  Then 
  

   comes 
  a 
  zone 
  in 
  which 
  the 
  surface 
  changes 
  are 
  more 
  abrupt, 
  the 
  

   slopes 
  of 
  the 
  stream 
  beds 
  have 
  been 
  altered 
  so 
  as 
  to 
  cause 
  con- 
  

   spicuous 
  changes 
  in 
  the 
  nature 
  of 
  the 
  streams, 
  but 
  any 
  fracture 
  or 
  

   faulting 
  which 
  may 
  have 
  taken 
  place 
  has 
  died 
  out 
  before 
  the 
  

   surface 
  was 
  reached. 
  And 
  north 
  of 
  this, 
  close 
  to 
  the 
  edge 
  of 
  the 
  

   hills, 
  the 
  rocks 
  have 
  been 
  fractured 
  and 
  faulted 
  right 
  up 
  to 
  the 
  

   surface. 
  

  

  The 
  changes 
  which 
  have 
  taken 
  place 
  are 
  most 
  conspicuous 
  in 
  

   the 
  Garo 
  Hills 
  just 
  west 
  of 
  the 
  91 
  meridian, 
  and 
  it 
  is 
  here 
  where 
  

   the 
  greatest 
  permanent 
  displacement 
  has 
  taken 
  place. 
  The 
  passage 
  

   of 
  a 
  zone 
  of 
  folding 
  unaccompanied 
  by 
  faulting 
  into 
  a 
  zone 
  of 
  

   faulting 
  and 
  folding 
  is 
  conspicuous, 
  as 
  also 
  the 
  fact 
  that 
  the 
  biggest 
  

   of 
  the 
  faults 
  is 
  also 
  the 
  most 
  northern. 
  

  

  On 
  the 
  eastern 
  line 
  the 
  folding, 
  and 
  consequent 
  interruptions 
  

   of 
  drainage, 
  is 
  much 
  less, 
  but 
  here 
  too 
  we 
  find 
  the 
  great 
  Bordwar 
  

   fracture 
  to 
  the 
  north 
  of 
  this 
  zone 
  — 
  a 
  fault, 
  except 
  in 
  the 
  absence 
  of 
  

   noticeable 
  throw. 
  

  

  Seeing 
  then 
  that 
  the 
  permanent 
  disturbance 
  becomes 
  more 
  ac- 
  

   centuated 
  to 
  the 
  north, 
  and 
  reaches 
  its 
  maximum 
  at 
  the 
  northern 
  

   edge 
  of 
  the 
  hills, 
  we 
  may 
  assume 
  that 
  it 
  does 
  not 
  abruptly 
  cease 
  

   along 
  that 
  line, 
  but 
  extends 
  out 
  under 
  the 
  alluvium 
  of 
  the 
  Goalpara 
  

   and 
  Kamrup 
  districts. 
  Here, 
  however, 
  we 
  enter 
  a 
  region 
  where 
  

   the 
  secondary 
  effects 
  of 
  the 
  earthquake 
  wave, 
  described 
  in 
  Chap- 
  

   ter 
  VII, 
  are 
  so 
  extensive 
  as 
  to 
  mask 
  the 
  primary 
  changes 
  of 
  the 
  

   nature 
  of 
  those 
  described 
  in 
  this 
  Chapter. 
  For 
  this 
  reason, 
  it 
  is 
  

   impossible 
  to 
  get 
  any 
  certain 
  proof 
  of 
  changes 
  of 
  level, 
  other 
  than 
  

   those 
  due 
  to 
  shiftings 
  of 
  the 
  superficial 
  layers 
  of 
  the 
  alluvium, 
  but 
  

   160 
  ) 
  

  

  