﻿Jag 
  gar 
  — 
  Lava 
  Flow 
  from 
  Maima 
  Loa, 
  1916. 
  261 
  

  

  "Disturbances 
  were 
  registered 
  during 
  the 
  twenty-four 
  hour 
  

   periods, 
  ending 
  in 
  the 
  forenoon 
  of 
  the 
  dates 
  specified, 
  as 
  

   follows 
  : 
  

  

  September 
  23, 
  three 
  well-marked 
  shocks 
  and 
  about 
  nine 
  

   other 
  disturbances 
  ; 
  September 
  24, 
  one 
  well-marked 
  shock 
  and 
  

   about 
  five 
  others 
  ; 
  September 
  25, 
  two 
  well-marked 
  shocks 
  and 
  

   one 
  other 
  ; 
  September 
  26, 
  the 
  day 
  of 
  the 
  crisis, 
  forty-four 
  well- 
  

   marked 
  shocks, 
  thirty-seven 
  definite 
  shocks 
  of 
  lesser 
  amplitude 
  

   and 
  eighty- 
  three 
  other 
  wave-groups, 
  some 
  of 
  which 
  almost 
  

   surely 
  were 
  minor 
  earthquakes 
  ; 
  September 
  27, 
  ten 
  well- 
  

   marked 
  shocks 
  and 
  twelve 
  others, 
  more 
  or 
  less 
  ; 
  September 
  28, 
  

   ten 
  well-marked 
  shocks 
  and 
  three 
  others; 
  and 
  September 
  29, 
  

   one 
  well-marked 
  shock 
  and 
  eight 
  other 
  disturbances. 
  The 
  

   total 
  for 
  the 
  week, 
  therefore, 
  is 
  108 
  earthquakes 
  about 
  half 
  of 
  

   which 
  were 
  of 
  very 
  small 
  amplitude 
  and 
  none 
  of 
  large 
  ampli- 
  

   tude, 
  and 
  121 
  other 
  definite 
  wave-groups, 
  many 
  of 
  which 
  

   probably 
  were 
  minute 
  earthquakes 
  and 
  many, 
  doubtless, 
  only 
  

   groups 
  of 
  volcanic 
  vibrations." 
  

  

  It 
  will 
  be 
  seen 
  from 
  this 
  description 
  that 
  the 
  total 
  of 
  all 
  local 
  

   seismic 
  disturbances 
  instrumental!} 
  7 
  recorded 
  at 
  Kilauea, 
  greater 
  

   and 
  smaller, 
  for 
  the 
  fortnight 
  ending 
  September 
  29, 
  1915, 
  was 
  

   258. 
  The 
  138 
  for 
  the 
  month 
  in 
  the 
  foregoing 
  table 
  refers 
  only 
  

   to 
  positive 
  earthquakes. 
  

  

  The 
  earthquakes 
  of 
  the 
  nine 
  days 
  September 
  17 
  to 
  25 
  were 
  

   especially 
  strongly 
  felt 
  in 
  the 
  Mauna 
  Loa 
  axis 
  (districts 
  Hilo, 
  

   Hamakua 
  and 
  Kau), 
  while 
  those 
  from 
  September 
  26 
  to 
  29 
  

   were 
  sharply 
  felt 
  in 
  the 
  Kilauea 
  axis 
  (district 
  Puna). 
  The 
  

   Weather 
  Bureau 
  reports* 
  that 
  eight 
  shocks, 
  September 
  17, 
  18, 
  

   19 
  and 
  25, 
  1915, 
  were 
  reported 
  from 
  Kohala, 
  Hamakua 
  and 
  

   Hilo 
  districts, 
  especially 
  severe 
  the 
  19th 
  and 
  25th 
  at 
  Ookala 
  

   and 
  Honomu. 
  These 
  districts 
  lie 
  on 
  the 
  north 
  side 
  of 
  Mauna 
  

   Kea 
  in 
  the 
  line 
  of 
  the 
  long 
  axis 
  of 
  Mauna 
  Loa 
  which 
  extended 
  

   would 
  divide 
  the 
  island 
  of 
  Hawaii 
  into 
  almost 
  equal 
  halves. 
  In 
  

   southern 
  Hawaii 
  no 
  earthquakes 
  were 
  reported 
  from 
  Weather 
  

   Bureau 
  stations 
  for 
  September, 
  and 
  none 
  whatever 
  for 
  the 
  date 
  

   of 
  the 
  instrumental 
  crisis 
  September 
  26. 
  

  

  Thus 
  it 
  would 
  appear 
  that 
  the 
  actual 
  equinox 
  period 
  Sep- 
  

   tember 
  19-25, 
  1915, 
  was 
  marked 
  by 
  a 
  few 
  strongly 
  felt 
  earth- 
  

   quakes 
  in 
  the 
  Mauna 
  Loa 
  axis 
  ; 
  that 
  this 
  was 
  followed 
  by 
  a 
  

   spasm 
  of 
  trembling 
  partly 
  felt 
  on 
  Kilauea 
  mountain, 
  very 
  

   intense 
  on 
  September 
  26 
  and 
  declining 
  thereafter, 
  and 
  exhib- 
  

   iting 
  earthquake 
  origins 
  locally 
  remote 
  from 
  Halemaumau 
  ; 
  

   and 
  that 
  a 
  great 
  crisis 
  of 
  subsiding 
  lava 
  in 
  the 
  Halemaumau 
  

   pit 
  took 
  place 
  at 
  the 
  average 
  rate 
  of 
  sixteen 
  feet 
  per 
  day 
  dur- 
  

   ing 
  the 
  six 
  days 
  September 
  22-28, 
  with 
  a 
  sudden 
  acceleration 
  

   in 
  the 
  subsidence 
  September 
  25-26 
  (fig. 
  1). 
  In 
  view 
  of 
  the 
  

   record 
  of 
  a 
  year 
  before, 
  September-November, 
  1914, 
  and 
  the 
  

  

  *Climatolog. 
  Data, 
  Hawaii 
  Section, 
  Sept., 
  1915, 
  Honolulu. 
  

  

  