﻿THE 
  UNFELT 
  EARTHQUAKE. 
  243 
  

  

  were 
  all 
  affected 
  by 
  the 
  shock, 
  and 
  I 
  am 
  indebted 
  to 
  Dr. 
  C. 
  Borgen 
  

   for 
  the 
  following 
  particulars, 
  obtained 
  by 
  measurement 
  from 
  the 
  

   original 
  traces. 
  The 
  times 
  are 
  reduced 
  to 
  Greenwich 
  Mean 
  Time 
  

   and 
  correct 
  to 
  about 
  half 
  a 
  minute 
  : 
  — 
  - 
  

  

  Perlinatio**,— 
  

  

  nh. 
  i9'5m. 
  first 
  indication. 
  

  

  26m. 
  first 
  distinctly 
  visible 
  wave 
  followed 
  by 
  several 
  small 
  waves. 
  

   44*5m. 
  first 
  strong 
  wave. 
  

   50*5m. 
  maximum. 
  

  

  56*0 
  m.") 
  

   to 
  y 
  

  

  many 
  shocks, 
  succeeding 
  each 
  other 
  quickly. 
  

   i2h. 
  o*5m. 
  

   I3h. 
  28m. 
  cessation 
  of 
  disturbance. 
  

  

  Horizontal 
  force. 
  — 
  

  

  uh. 
  19m. 
  first 
  indication. 
  

  

  42*5 
  strong 
  disturbance 
  ; 
  after 
  this 
  the 
  record 
  ceases 
  till 
  uh 
  57'5m. 
  

   after 
  which 
  it 
  is 
  again 
  visible. 
  

   i2h. 
  40m. 
  cessation. 
  

  

  Vertical 
  force. 
  — 
  

  

  uh. 
  265m. 
  commencement, 
  

  

  uh. 
  29m. 
  small 
  wave, 
  

  

  uh. 
  31m. 
  larger 
  wave, 
  

   uh. 
  40m. 
  

  

  to 
  7 
  a 
  violent 
  movement 
  of 
  the 
  magnet 
  causing 
  a 
  blurred 
  u 
  trace. 
  

  

  I2h. 
  om. 
  J 
  

  

  Copenhagen. 
  — 
  The 
  magnetographs 
  in 
  the 
  observatory 
  of 
  the 
  

   Meteorological 
  Institute 
  at 
  Copenhagen 
  were 
  affected 
  by 
  the 
  shock. 
  

   I 
  am 
  indebted 
  to 
  Dr. 
  A. 
  Paulsen, 
  the 
  Director 
  of 
  the 
  Institute, 
  for 
  

   the 
  following 
  particulars, 
  obtained 
  by 
  direct 
  measurement 
  on 
  the 
  

   original 
  records 
  :— 
  

  

  Declination, 
  commencement 
  of 
  disturbance 
  uh. 
  25'5m., 
  end 
  nh. 
  

   56*5m.; 
  maximum 
  uh. 
  36m. 
  ; 
  maximum 
  angular 
  displacement 
  

   075m. 
  

  

  Horizontal 
  force, 
  commencement 
  of 
  disturbance 
  uh. 
  16*51*1. 
  end 
  

   uh. 
  51*5111, 
  maximum 
  displacement 
  o6na. 
  at 
  uh, 
  36m, 
  

  

  Vertical 
  force. 
  — 
  A 
  disturbance 
  of 
  the 
  trace 
  was 
  noticed 
  at 
  uh, 
  

  

  47 
  m 
  »> 
  the 
  angular 
  displacement 
  is 
  too 
  small 
  to 
  be 
  measured. 
  

   R 
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