﻿THE 
  EARTHQUAKE 
  SOUND. 
  I97 
  

  

  Thus, 
  in 
  the 
  23 
  hours 
  over 
  which 
  the 
  record 
  extends, 
  48 
  distinct 
  

   tumbles 
  were 
  heard, 
  or 
  at 
  the 
  average 
  of 
  about 
  50 
  per 
  diem 
  ; 
  and 
  of 
  

   these 
  only 
  the 
  7 
  marked 
  with 
  an 
  asterisk 
  were 
  accompanied 
  by 
  a 
  

   shock 
  that 
  could 
  be 
  felt, 
  

  

  This 
  degree 
  of 
  frequency 
  was 
  much 
  greater 
  than 
  I 
  observed 
  else- 
  

   where, 
  and 
  it 
  was 
  noteworthy 
  that 
  at 
  my 
  next 
  camp 
  at 
  Samin, 
  which 
  

   was 
  close 
  to 
  the 
  fault 
  described 
  in 
  chapter 
  X, 
  sounds 
  were 
  much 
  

   Jess 
  frequent, 
  not 
  more 
  than 
  8 
  or 
  10 
  in 
  the 
  day, 
  and 
  mostly 
  accom- 
  

   panied 
  by 
  distinct 
  shakes. 
  From 
  Samin 
  I 
  marched 
  northwards 
  to 
  

   the 
  neighbourhood 
  of 
  Damra 
  and 
  found 
  the 
  sounds 
  more 
  frequent 
  

   again. 
  When 
  working 
  along 
  the 
  great 
  Chedrang 
  fault 
  I 
  again 
  noticed 
  

   the 
  fewness 
  of 
  sounds, 
  and 
  more 
  especially 
  of 
  those 
  unaccompanied 
  

   by 
  shocks 
  that 
  could 
  be 
  felt. 
  In 
  other 
  words, 
  the 
  sounds, 
  unaccom- 
  

   panied 
  by 
  shocks, 
  appeared 
  to 
  be 
  more 
  common 
  where 
  the 
  surface 
  

   disturbance 
  had 
  taken 
  the 
  form 
  of 
  bending, 
  than 
  where 
  fractures 
  had 
  

   extended 
  to 
  the 
  surface. 
  

  

  This 
  conclusion, 
  and 
  most 
  others 
  regarding 
  the 
  sound 
  phenomena, 
  

   must 
  be 
  taken 
  merely 
  for 
  what 
  they 
  are 
  worth. 
  It 
  was 
  impossible 
  to 
  

   test 
  them 
  by 
  comparison 
  of 
  simultaneous 
  observations 
  at 
  different 
  

   places, 
  and 
  it 
  is 
  possible 
  that 
  the 
  results 
  might 
  have 
  been 
  different 
  

   had 
  I 
  been 
  at 
  my 
  different 
  camps 
  on 
  dates 
  other 
  than 
  those 
  

   on 
  which 
  I 
  actually 
  was 
  at 
  each 
  particular 
  place. 
  

  

  With 
  regard 
  to 
  the 
  nature 
  of 
  the 
  sounds 
  there 
  was 
  great 
  

   variation. 
  As 
  a 
  rule, 
  they 
  began 
  as 
  a 
  low, 
  almost 
  inaudible 
  rumble, 
  

   gradually 
  increasing 
  in 
  loudness, 
  though 
  to 
  a 
  very 
  varying 
  degree, 
  

   and 
  then 
  gradually 
  dying 
  out 
  after 
  having 
  lasted 
  anything 
  from 
  5 
  to 
  

   50 
  seconds. 
  It 
  cannot 
  be 
  said 
  that 
  there 
  was 
  any 
  connection 
  between 
  

   the 
  duration 
  and 
  the 
  loudness 
  of 
  the 
  sounds, 
  some 
  of 
  the 
  most 
  

   prolonged 
  never 
  becoming 
  loud, 
  and 
  some 
  of 
  those 
  which 
  lasted 
  

   a 
  shorter 
  period 
  being 
  as 
  loud 
  as 
  ordinary 
  thunder 
  at 
  a 
  distance 
  of 
  

   two 
  or 
  three 
  miles. 
  

  

  Frequently, 
  instead 
  of 
  commencing 
  gradually, 
  the 
  sound 
  com- 
  

   menced 
  abruptly 
  at 
  its 
  maximum 
  loudness 
  and 
  then, 
  after 
  a 
  pro- 
  

  

  ( 
  '97 
  ) 
  

  

  