 The volcano also erupted phreatically several times , as recorded by Vogel in 1913 and 1920 , with its activity increasing from 1916 to 1926 . During these years , the eruptions grew more frequent and more violent . A major outburst on November 2 , 1927 started a period of nearly continuous violent eruptions that lasted until 1929 . During this period , Cerro Azul sometimes erupted daily , sending columns of ash as far as 6 or 7 kilometers ( about 4 mi ) into the air . Quizapu Crater grew slightly during this eruptive period . 
