|Santa María, Santiaguito|
Santiaguito side cone from the summit of Santa María
|Elevation||3,772 m (12,375 ft)|
|Location||Quetzaltenango Department, Guatemala|
|Parent range||Sierra Madre|
|Volcanic arc/belt||Central America Volcanic Arc|
|Last eruption||1922 to present|
The VEI-6 eruption of Santa María Volcano in 1902 was one of the three largest eruptions of the 20th century, after the 1912 Novarupta and 1991 Mount Pinatubo eruptions. It is also one of the five biggest eruptions of the past 200 (and most likely 300) years.
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Santa María Volcano is part of the Sierra Madre range of volcanoes, which extends along the western edge of Guatemala, separated from the Pacific Ocean by a broad plain. The volcanoes are formed by the subduction of the Cocos Plate under the Caribbean Plate, which led to the formation of the Central America Volcanic Arc.
Eruptions at Santa María are estimated to have begun about 103 ka. Construction of the volcanic edifice occurred in four phases, from 103-72, 72, 60-46, and 35-25 ka , building up the large cone that reaches about 1,400 metres (4,600 ft) above the plain on which the nearby city of Quetzaltenango sits. Following the cone-building eruptions, activity seems to have changed to a pattern of long periods of repose followed by the emission of small lava flows from vents on the mountain.
The first eruption of Santa María in recorded history occurred in October 1902. Before 1902 the volcano had been dormant for at least 500 years and possibly several thousand years, but its awakening was clearly indicated by a seismic swarm in the region starting in January 1902, which included a major earthquake in April 1902. The eruption began on 24 October, and the largest explosions occurred over the following two days, ejecting an estimated 8 cubic kilometres (1.9 cu mi) of magma. The eruption was one of the largest of the 20th century, only slightly less in magnitude to that of Mount Pinatubo in 1991. The eruption had a Volcanic Explosivity Index (VEI) of 6, thus being 'Colossal'.
The pumice formed in the climactic eruption fell over an area of about 273,000 square kilometres (105,000 sq mi), and volcanic ash as far away as San Francisco, 4,000 kilometres (2,500 mi) away. The eruption occurred out of a vent on the southwest side of the volcano, leaving a crater about 1 kilometre (0.6 mi) in diameter and about 300 metres (980 ft) deep, stretching from just below the summit to an elevation of about 2,300 metres (7,500 ft). The first evidence of the eruption was a sprinkling of sand on Quezaltenango. The wind then changed from the south to the east and ashes began to fall at Helvetia, a coffee plantation six miles to the South-West.
Because of the lack of recorded eruptive activity at Santa María, local people did not recognise the preceding seismicity as warning signs of an eruption. Estimates are that 6,000 people died as a result of the eruption.
In the middle of the disaster, Quetzaltenango regional authorities had to take charge, as the central government was focused on the celebration of the "Fiestas Minervalias", the largest propaganda festival of president Manuel Estrada Cabrera' regime; furthermore, the central government was so focused on the festival that it tried to minimize the impact of the eruption and went as far as tell the citizens that it was not in Guatemalan soil, but in México. Furthermore, the official government response was to tell Quetzaltenango authorities that there were no funds for the recovery, as those were already spent to help after the April 1902 earthquake. Under such circumstances, Quetzaltenango regional authorities declared that all the West zone agricultural harvest was ruined, and forecasted famine due to food shortages; likewise, cattle were dying and there were meat shortages as well. They were allowed by the central government to import flour free of taxes for the next few months.
For the native people the eruption consequences were catastrophic: they not only lost relatives, friends, homes and harvest, but they were also forced to work free of charge in the recovery while "criollo" landlords were compensated by the loss with lands that were confiscated from native communities in San Miguel Uspantán Quiché Department, Panam in Suchitepéquez Department and in Sololá Department.
The 1902 eruption was followed by 20 years of dormancy. New eruptions began in 1922, with the extrusion of a lava dome complex in the crater left by the 1902 eruption. The lava dome complex, which was named Santiaguito, is still active today with over 1km3 of lava erupted so far. The lava dome complex has four main domes: El Caliente, La Mitad, El Monje and El Brujo. The currently active vent is El Caliente.
The dome growth has been both endogenous and exogenous. The former implies dome interior expansion to accommodate new lava and the latter refers to superficial piling up of lava. Activity has been concentrated at several different vents, and Santiaguito now has the appearance of several overlapping domes. At the beginning of dome growth the composition was dacite, identical to the composition of the Santa Maria eruption. By 1990 the composition had shifted to a less evolved andesite. It has been proposed that this is due to a stratified magma chamber beneath the volcano.
The early (pre-1990) exogenous volcanism has consisted of lava spines and lava flows. Nowadays, only lava flows are erupted. All the volcanic activity is cyclic with 10+ year cyclic timescales between periods of high volcanism with high extrusion rates and low volcanism with low extrusion rates. The latest with high extrusion rate was in 2011-2015 with the emplacement of more than four new lava flows. Frequent small eruptions and pyroclastic flows have been ongoing throughout dome growth.
Although most of Santiaguito's eruptive activity has been relatively gentle, occasional larger explosions have occurred. In 1929 part of the dome collapsed, generating pyroclastic flows which killed anywhere from several hundred up to 5,000 people. Occasional rockfalls have generated smaller pyroclastic flows, and vertical eruptions of ash to heights of a few kilometres above the dome are common. Santiaguito is now a tourist attraction, as minor eruptions occur with regularity and can be observed by visitors from the summit of Santa Maria.
The areas to the south of Santa María are considerably affected by volcanic activity at Santiaguito. Currently, the most common volcanic hazards at Santa María are lahars, which frequently occur in the rainy season due to heavy rainfall on loose volcanic deposits. Lahars are particularly large and frequent during periods of high volcanism at Santiaguito. The town of El Palmar, 10 kilometres (6 mi) from Santiaguito, has been destroyed twice by lahars from Santiaguito forcing the town to be moved to the present Nuevo El Palmar, and infrastructure such as roads and bridges have been repeatedly damaged. Lahar deposits from Santiaguito have affected rivers all the way downstream to the Pacific Ocean.
Near constant lava flows occur from Santiaguito, and can reach up to 4km from the vent. Lava flow activity occurs in cycles, with the longest lava flows occurring during times of high volcanic activity. Much shorter lava flows occur during the longer periods of low volcanic activity. These lava flows flow only a short distance from the vent before collapsing. The magma at Santiaguito is rich in silica and is thus highly viscous. The lava flows are slow moving and mostly cause property damage, although in the past catastrophic pyroclastic flows have been triggered from lava flows, which have extended several kilometers towards the west.
One hazard which could be devastating is the collapse of Santa María itself. The 1902 crater has left the southern flank of the mountain above Santiaguito highly over-steepened, and a large earthquake or eruption from Santiaguito could trigger a huge landslide, which might cover up to 100 square kilometres (39 sq mi). However, this is thought to be unlikely in the short term.
In light of the threat it poses to nearby populations, Santa María has been designated a Decade Volcano, identifying it as a target for particular study by volcanologists to mitigate any future natural disasters at the volcano.