The June 30, 1997 event was the most serious since the activity was reprocessed at the end of 1994. The eruption was preceded by a series of volcanic earthquakes with magnitudes of 2.0 to 2.7 over a 13-minute period. This eruption created a huge cloud that soon spread over 8 km over the volcano. The intensity of the eruption was estimated to be between 2 and 3 on the VEI scale and the scientific committee recommended that the volcanic alert be set for several hours at the red level, the highest alert level, although no evacuations were carried out. Diego Rivera presented Popocatépetl in several of his works, but best known as the dominant setting of his oil painting `The Threshing Floor (La era)` from 1904 now at the Museo Casa Diego Rivera in Guanajuato. Popocatépetl is one of Mexico`s most active volcanoes and the most famous with more than 15 major eruptions since the arrival of the Spaniards in 1519. Our research focuses on understanding why Popocatépetl eruptions change from moderately to large formatted, and determining the time scales on which these switches occur. We hope to see if the volcano`s current explosive activity will culminate with an eruption in the Plianies. In the visual arts, Popocatépetl is the theme of Marsden Hartley`s painting “Popocatepetl, Spirited Morning– Mexico“ now at the Smithsonian American Art Museum in Washington, D.C.. Activity of the volcanoes Popocatepetl and Colima, Mexico The geological history of Popocatépetl began with the formation of the ancestral volcano Nexpayantla. About 200,000 years ago, Nexpayantla collapsed during an eruption, leaving behind a caldera in which the nearest volcano, known as El Fraile, began to form.
Another eruption, about 50,000 years ago, caused the rupture, and popocatépetl increased. About 23,000 years ago, a lateral eruption (probably larger than the eruption of Mount St. Helena in 1980) destroyed the volcano`s ancient cone and caused an avalanche up to 70 kilometres from the summit. The debris field is one of four around the volcano, and it is also the youngest.  Several works by M.