sentences:  This explosive eruption originated from a vent on the southwestern flank of Mocho's edifice and produced pyroclastic flows.According to a missionary from Quinchilca, who was interviewed by Vidal Gormaz in 1869, a strong noise followed by an earthquake was felt during one of the first days of November 1864.The last reported eruption, is supposed to have occurred on June 16, 1936.