Popocatépetl is an active stratovolcano located in the states of Puebla, Morelos, and Mexico in central Mexico. It lies in the eastern half of the Trans-Mexican volcanic belt. At 5,426 m (17,802 ft) it is the second highest peak in Mexico, after Citlaltépetl (Pico de Orizaba) at 5,636 m (18,491 ft).

It is linked to the twin volcano of Iztaccihuatl to the north by the high saddle known as the "Paso de Cortés". Izta-Popo Zoquiapan National Park, wherein the two volcanoes are located, is named after them.

Popocatépetl is 70 km (43 mi) southeast of Mexico City, from where it can be seen regularly, depending on atmospheric conditions. Until recently, the volcano was one of three tall peaks in Mexico to contain glaciers, the others being Iztaccihuatl and Pico de Orizaba. In the 1990s, the glaciers such as Glaciar Norte (North Glacier) greatly decreased in size, partly due to warmer temperatures but largely due to increased volcanic activity. By early 2001, Popocatépetl's glaciers were gone; ice remained on the volcano, but no longer displayed the characteristic features of glaciers such as crevasses.

Lava erupting from Popocatépetl has historically been predominantly andesitic, but it has also erupted large volumes of dacite. Magma produced in the current cycle of activity tends to be a mixture of the two with the andesites being rich in magnesium.

The name Popocatépetl comes from the Nahuatl words popōca (Nahuatl pronunciation: [poˈpoːka]) "it smokes" and tepētl [ˈtepeːt͡ɬ] "mountain", meaning Smoking Mountain. The volcano is also referred to by Mexicans as El Popo affectionately, or to shorten the full name.

Geology

The stratovolcano contains a steep-walled, 400 m × 600 m (1,300 ft × 2,000 ft) wide crater. The generally symmetrical volcano is modified by the sharp-peaked Ventorrillo on the NW, a remnant of an earlier volcano. At least three previous major cones were destroyed by gravitational failure during the Pleistocene, producing massive debris avalanche deposits covering broad areas south of the volcano. The modern volcano was constructed to the south of the late-Pleistocene to Holocene El Fraile cone. Three major Plinian eruptions, the most recent of which took place about 800 AD, have occurred from Popocatépetl since the mid-Holocene, accompanied by pyroclastic flows and voluminous lahars that swept basins below the volcano.

According to paleomagnetic studies, the volcano is about 730,000 years old. It is cone shaped with a diameter of 25 km (16 mi) at its base, with a peak elevation of 5,450 m (17,880 ft). The crater is elliptical with an orientation northeast-southwest. The walls of the crater vary from 600 to 840 m (1,970 to 2,760 ft) in height. Popocatépetl is currently active after being dormant for about half of last century. Its activity increased in 1991 and smoke has been seen constantly emanating from the crater since 1993.

History

The geological history of Popocatépetl began with the formation of the ancestral volcano Nexpayantla. About 200,000 years ago, Nexpayantla collapsed in an eruption, leaving a caldera, in which the next volcano, known as El Fraile, began to form. Another eruption about 50,000 years ago caused that to collapse, and Popocatépetl rose from that. Around 23,000 years ago, a lateral eruption (believed to be larger than the 1980 eruption of Mount St. Helens) destroyed the volcano's ancient cone and created an avalanche that reached up to 70 kilometres (43 mi) from the summit. The debris field from that is one of four around the volcano, and it is also the youngest.

Three Plinian eruptions are known to have taken place: 3,000 years ago (3195–2830 BC), 2,150 years ago (800–215 BC), and 1,100 years ago (likely 823 AD). The latter two buried the nearby village of Tetimpa, preserving evidence of preclassical culture.

Popocatépetl is one of the most active volcanoes in Mexico and the most famous, having had more than 15 major eruptions since the arrival of the Spanish in 1519.

Legend

Popocatépetl and Iztaccíhuatl refers to the volcanoes Popocatépetl ("the Smoking Mountain") and Iztaccíhuatl ("white woman" in Nahuatl, sometimes called the Mujer Dormida "sleeping woman" in Spanish) in Iztaccíhuatl–Popocatépetl National Park, which overlook the Valley of Mexico and the various myths explaining their existence. The most common variety relates the Nahua romance of the princess Iztaccíhuatl and the warrior Popocatépetl. This tale is recorded in several different versions.

In Aztec mythology, Iztaccíhuatl was a princess who fell in love with one of her father's warriors, Popocatépetl. The emperor sent Popocatépetl to war in Oaxaca, promising him Iztaccíhuatl as his wife when he returned (which Iztaccíhuatl's father presumed he would not). Iztaccíhuatl was falsely told that Popocatépetl had died in battle, and believing the news, she died of grief. When Popocatépetl returned to find his love dead, he took her body to a spot outside Tenochtitlan and kneeled by her grave. The gods covered them with snow and changed them into mountains. Iztaccíhuatl's mountain is called "Sleeping Woman" (Though the Nahuatl name literally means "White Woman" from iztāc "white" and cihuātl "woman") because it resembles a woman lying on her back, and is often covered with snow — the peak is sometimes nicknamed La Mujer Dormida, "The Sleeping Woman". Popocatépetl became an active volcano, raining fire on Earth in blind rage at the loss of his beloved.

A different tale was told by the Nahuatl-speakers of Tetelcingo, Morelos, according to whom Iztaccíhuatl was the wife of Popo, but Xinantécatl wanted her, and he and Popocatépetl hurled rocks at each other in anger. This was the genesis of the rocky mountain ranges of the continental divide and the Trans-Mexican volcanic belt that lie between the two mountains. Finally Popocatépetl, in a burst of rage, flung an enormous chunk of ice, decapitating the Nevado de Toluca. This is why the Nevado is flat-topped, with wide shoulders but no head. Conceivably this legend preserves the memory of catastrophic eruptions.

The most popular legend about Iztaccíhuatl and Popocatépetl comes from the ancient Nahuas

Many years before conquistador Hernán Cortés came to Mexico, the Aztecs lived in Tenochtitlan, today's Mexico City. The chief of the Aztecs was a famous Emperor, who was loved by all the natives. The Emperor and his wife, the Empress, were very worried because they had no children. One day the Empress said to the Emperor that she was going to give birth to a child. A baby girl was born and she was as beautiful as her mother. They called her Iztaccíhuatl, which in Náhuatl means "white lady". All the natives loved Izta, and her parents prepared her to be the Empress of the Aztecs. When she grew up, she fell in love with a captain of a tribe, his name was Popoca, however the Emperor would not allow them to marry. One day, a war broke out with the fate of the Empire at stake, and the Aztec warriors had to go South to fight the enemy. The Emperor told Popoca that he had to bring the head of the enemy chief back from the war, so he could marry his daughter. After several months of combat, a warrior who hated Popoca sent a false message to the Emperor. The message said that his army had won the war, but that Popoca had died in battle. The Emperor was very sad when he heard the news, and when Izta heard she could not stop crying. She refused to go out and did not eat any more. A few days later, she became ill and she died of sadness. When the Emperor was preparing Izta's funeral, Popoca and his warriors arrived victorious from war. The Emperor was taken aback when he saw Popoca but prepared to offer the throne, to which Popoca turned down as he only wanted to marry Izta. The Emperor announced that Izta had died of a broken heart. Popoca killed the warriors who had sent the false message to the Emperor. He then took Izta's body and left the town. He walked a long way until he arrived at some mountains where he ordered his warriors to build a funeral table with flowers and he put Izta lying on top. Then he knelt down to watch over Izta and died of sadness too. The Gods were touched by Popoca's sacrifice and turned the tables and the bodies into great volcanoes. The biggest volcano is Popocatépetl, which in Náhuatl means "smoking mountain". He sometimes throws out smoke, showing that he is still watching over Iztaccíhuatl, who sleeps by his side

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