The recorded eruption of this volcano began at 1535, and it has been active intermittently for 500 years, including more than 20 recorded eruptions, and it is still active frequently in recent years. 1993 65438+1October 14, Galleras volcano erupted, causing at least 10 deaths, and many others were injured and missing, including six volcanologists; 1993 When the volcano erupted, the geological survey team led by American volcanologist Stanley Williams had just climbed Mount Galleras. The spurt of flame and poison gas killed six Williams companions on the spot. He himself was "lying on the ground, covered in blood and volcanic ash, wet by the rain, and his burnt clothes could not cover the exposed bone stubble", which almost killed him. On June165438+1October 2 1 day, 2004, Mount Galleras erupted again, and the huge vibration could be felt 20 kilometers away. When the volcano erupted, the surrounding rocks were splashed 3 kilometers to the east, and the columnar smoke from the volcano spread to the height of 10 to 15 kilometers. On June 65438+1October 65438+July, 2008, Mount Galleras erupted violently again, forming a volcanic ash column thousands of meters high in the air, forcing thousands of residents nearby to evacuate urgently.