ACTIVITY OF PARICOTIM VOLCANO FROM MAY 4 TO SEPTEMBER 18, 1946 
Kenneth Seger&trom and Celedonlo Gutierrez 
The eruptive activity of PeHcutln Volcano has been class! 
"led by EZE1 01 KL OBDOflEE end ARIEL HERNANDEZ VELASCO into three 
ses, each seeming to follow the other In succession! (1) the 
tubular eruption, consisting of explosive reports as if from tubes 
like carSpris, synchronized with puffs of vapor and forming & 
column charged with such pyroclastic material j (S) the silent 
'option, .varying from roiling, thunder ~ , deep end 
subdued, through periods of complete silence, to rare noises like 
the faint beating of the surf, accompanied by the emission of 
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consider- hie pyroclastic material; and (3) the gaseous eruption, 
character! ted by a steady n .-.ise like that of escaping steam, 
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during which white vapors are emitted, at times stained yellow 
w ith traces of ash. 
GEORGE C. KENNEDY described the activity as having been 
very weak from April 30 to May 3, following an earlier period 
of strong eruption. On the afternoon of May 3 the third phase 
of the above succession started, with a steady steam- escape roar 
accompanied by the emission of light vapor 3 or none at all. 
This continued through May 5. 
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On May 6 phase 1 began again, with a tubular eruption 
characterized by a black column that was as full of ejecta as 
in March 1943. On the next day there was virtual silence, tut 
some pyroclastic material was erupted. On the 8th this turned 
into another gaseous phase, which lasted until noon of the 13th, 
v hen a renewal of strong activity was heralded by puffs of vapor 
