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Guallatiri

Coordinates:18°25′25″S69°5′23″W/ 18.42361°S 69.08972°W/-18.42361; -69.08972
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"Wallatiri" redirects here. For other uses, seeWallatiri (disambiguation).

Guallatiri
Fumaroleactivity in the crater of Guallatiri
Highest point
Elevation6,071 m (19,918 ft)Edit this on Wikidata
Coordinates18°25′25″S69°5′23″W/ 18.42361°S 69.08972°W/-18.42361; -69.08972[1]
Naming
Native nameWallatiri(Aymara)
Geography
Guallatiri is located in the northern part of Chile
Guallatiri is located in the northern part of Chile
Guallatiri
Location of Guallatiri in Chile
LocationPutre,Parinacota Province,Arica y Parinacota Region,Chile
Geology
Age of rockPleistocene-Holocene
Mountain typeVolcano
Last eruption1960

Guallatiriis avolcanoinChilewith an elevation of 6,060 to 6,071 m (19,882 to 19,918 ft). It is located southwest of theNevados de Quimsachatavolcanic group; some sources classify Guallatiri as a member. Guallatiri is astratovolcanowith numerousfumarolesaround the summit. The summit may be alava domeorvolcanic plug,while the lower flanks of the volcano are covered bylava flowsand lava domes. The volcano's eruptions have produced mostlydacitealong withandesiteandrhyolite.Pastglaciationhas leftmoraineson Guallatiri.

A large eruption took place approximately 2,600 years ago. Guallatiri has beenactivein historical times with a number of eruptions, the latest in 1960. Fumarolic and seismic activity is ongoing and has resulted in the deposition ofsulfurand other minerals on the volcano. The volcano is covered by anice capabove 5,500 to 5,800 m (18,000 to 19,000 ft) that has shrunk and fragmented during the course of the 20th and 21st centuries. Guallatiri, along with several other volcanoes, is part ofLauca National Parkand is monitored by the ChileanNational Geology and Mining Service(SERNAGEOMIN).

Name and ascents

[edit]

The term Guallatiri is derived fromwallatiri,which means'abundance of theAndean goose'inAymara,[2][3]referring to the birds' frequent occurrence in the area.[4]Other names arePunata(also an Aymara word),[5]Huallatiri, Huallatire[6]and Guallatire.[7]It was first climbed in 1926 by the geologistFriedrich Ahlfeld[de].[8]The volcano is considered to be easy to ascend (rated F on theFrench Climb gradingby John Biggar) but toxic gases constitute a hazard in the summit region.[9]

Geography and geomorphology

[edit]

The volcano lies in thePutremunicipality,[10]Arica y Parinacota Region.[a]It is located south ofLake Chungará[10] and 4 km (2.5 mi) west ofCerro Capurata.[12]The latter is part of theNevados de Quimsachatavolcano chain which includesUmurata,AcotangoandCapurata;[13]sometimes Guallatiri is considered to be part of the Nevados de Quimsachata.[5][14]The older Umurata and Acotango volcanoes are heavily eroded;[13]Capurata is better preserved.[15]Guallatiri is part of the largerWestern Cordillera,[16]the western boundary of theAltiplanohigh plateau.[17]

The small town of Guallatiri is 9.5 km (5.9 mi) southwest of the volcano and is the settlement closest to it;[18]the town has a 17th-century church and a refuge of theNational Forest Corporation.[4]Other nearby towns include Ancuta, Carbonire and Churiguaya. As of 2017each had a population of less than 25 people.[18]The provincial capitalPutreis 55 km (34 mi) north of the volcano, and 130 km (81 mi) farther west, on the Pacific coast, isArica.[18]Economic activity in the area includes theTambo Quemadoborder crossing,agriculture, animal husbandry, tourism and mountaineering, including ascents to the summit of Guallatiri.[19][4]There are no known archeological sites on the summit of Guallatiri, unlike several other mountains in the region. Possible reasons are the continuous ice cover and the constant volcanic activity.[20]The frontier between Bolivia and Chile runs along the Nevados de Quimsachata northeast of Guallatiri,[21][1]not far from the volcano.[10][b]The volcano is remote and thus poorly known.[23]

The volcano

[edit]

Guallatiri is 6,060 m (19,880 ft)[24][25][10]or 6,071 m (19,918 ft) high;[11][1]claims of even higher elevations appeared in past[26]and some recent publications.[7]It is acomposite volcano[5]orstratovolcanowith a symmetric cone surmounted by alava dome,lava complex[1]orvolcanic plug[27]and a vent just south of it.[1]

Lava domes, lava flows,[28]tephra[c]andvolcanic ashmake up the mountain.[30]Guallatiri rises about 1.7 km (1.1 mi) above the surrounding terrain[5][d]and covers an area of about 85 km2(33 sq mi); the total volume is about 50cubic kilometres(12 cubic miles).[32]Thick lava flows emanate in all directions[15]but are primarily noted on the northern and western flanks.[1]The flows reach thicknesses of 230 m (750 ft)[33]and lengths of 8 km (5 mi).[34]The lava flows have alobateappearance even when they are heavily eroded, and displaylevees,ogives,polygonal cracks and blocky surfaces. Older flows have been eroded into hills.Block-and-ash flowsform fans on the southern and southwestern flanks. Tephra deposits are mainly located on the eastern and southern side of Guallatiri.[35]Tuffsandpyroclastic flowdeposits occur both in the summit region and in radial valleys that emanate from Guallatiri,[36]although some of the deposits southwest of the volcano have been reinterpreted as being reworked sediments.[37]Apart from volcanic rocks,glacial depositscover large parts of the volcano,[38]and there are traces ofmass failures.[39]

On the southern flank, there are twolava domesnamed Domo Tinto and Domo Sur;[40]other than these Guallatiri has no lateral vents.[34]Domo Tinto is 100 m (330 ft) wide and 100 m (330 ft) high while Domo Sur (1.5 km (0.93 mi) southwest of Domo Tinto) is 120 m (390 ft) thick and 750 m (2,460 ft) wide.[41]Domo Tinto has a hummocky surface and resembles a pancake.[42]

There are both coldspringsandhot springson Guallatiri, indicating thatgroundwaterinteracts with the magmatic system.[43]One hot spring is located at Chiriguaya on the northwestern foot of Guallatiri,[38]where temperatures of 48 °C (118 °F) were measured in bubbling pools,[44]andsinterdeposition takes place.[45]Severalstreamsrun off the mountain; they eventually enterLake Chungaráand theLauca River.[18]

Ice

[edit]

Above 5,500 m (18,000 ft)[46]–5,800 m (19,000 ft) elevation[5]the volcano is covered with ice.[1]As of 2017,anice capon Guallatiri covered an area of 0.796 km2(0.307 sq mi) and had a volume of 0.026 km3(0.0062 cu mi).[18]Ice area has beenretreatingat a rate of 0.07 square kilometres per year (0.027 square miles per year) (between 1988 and 2017), leading to the breakup of the ice cap into several separate ice bodies.[47]According to a 2005 study by Riveraet al.,heat emitted byfumarolesmay have contributed to the enhanced melting of the ice.[48]

Glacial deposits on Guallatiri cover an area of about 80 km2(31 sq mi) above 4,650 m (15,260 ft) elevation, with lateral moraines reaching lengths of 2 km (1.2 mi) and thicknesses of 15 m (49 ft).[41]Glaciers reached their maximum extent between 13,500 and 8,900 years ago.[41]This is unlike the globalLast Glacial Maximum(LGM), which peaked between 21,000 and 19,000 years ago.[39]This is a consequence of the climate in the region, where glacier extent was more sensitive to increased moisture supply than to decreasing temperatures;[49]presumably the global LGM was too dry to allow glacier formation.[50]Some glaciers were still present during the Holocene, evidenced by Holocene-age Domo Tinto lava dome which bears traces of glacial erosion[41]and is partially covered by moraines.[42]

Volcanic unitsare found both overlying[39]and underlying glacial deposits[14]such asmoraines.Older volcanic rocks bearglacial striations,[51]andvolcanic bombson the lower flanks may have been transported there by glaciers.[27]

Geology

[edit]

Off the western coast of South America, theNazca Platesubductsbeneath theSouth American Plateat a rate of about 7–9 centimetres per year (2.8–3.5 inches per year). The subduction process is responsible for the volcanism of theNorthern Volcanic Zone,Central Volcanic Zone(CVZ) andSouthern Volcanic Zone,and has also driven the formation of the Altiplano during the last 25 million years.[52]

The CVZ is a 1,500 km (930 mi) long chain of volcanoes[53]spanning southern Peru, northern Chile, western Bolivia and northwestern Argentina. It contains about 58 active or potentially active volcanoes,[52]33 of which are located within Chile. The most active CVZ volcano isLascar,which in 1993 produced the largest historical eruption of northern Chile.[54]

Guallatiri rises aboveOligocenetoPlioceneage volcanic and sedimentary rocks, which define the Lupica and LaucaFormations.[18]The Lupica Formation is older and consists mainly of volcanic rocks, while the Lauca Formation is formed by volcanic and sedimentary rocks that were deposited within the basin and in part altered by glaciers.[13]ArcheantoPrecambrian-Paleozoicrocks make up thebasement.[52]There is evidence that the terrain wastectonically activeduring theQuaternary.[55]

Composition

[edit]

The composition of Guallatiri's rocks ranges fromandesiteoverdacitetorhyolite,[1]with dacites being predominant.[56]The summit dome is formed bydacite[1]and most outcrops aretrachyandesiteandtrachydacite.[38]The rocks define apotassium-richcalc-alkalinesuite and containamphibole,apatite,biotite,clinopyroxene,olivineandplagioclasephenocrysts,similar to other volcanoes in the region.[56][14]A singlelava bombmade out ofobsidianhas been found.[27]Mafic[e]rock enclaves have been observed in Domo Tinto rocks, which indicate that mafic magmas were injected into themagma chamberand mixed with already present magma.[40]Fractional crystallizationand magma mixing processes gave rise to Guallatiri's magmas.[58]

Fumaroles have deposited minerals such asanhydrite,baryte,cristobalite,gypsum,quartz,sassoliteandsulfur.Less common aregalena,orpimentandpyrite.[59]Sulfur deposits have yellow, orange or red colours and are sometimes accompanied byarsenic-sulfur compounds[60]that also containiodine,mercury,seleniumandtellurium.[61]Sulfurdeposits occur on Guallatiri's southern flank;[10]according to the first Panamerican Congress on Mine Engineering and Geology, in 1942 the volcano had about 800,000 metric tons (790,000 long tons; 880,000 short tons) of sulfurorewith a grade of about 55% sulfur.[62]The volcano may be an important cause ofarsenic pollutionin the region.[63]

Flora, fauna and climate

[edit]
Landscape under Guallatiri, with the fumaroles visible

The volcano is inside theLauca National Park[64]and thewetlands(Spanish:Bofedales) in the area of Guallatiri have regional importance.[65]Vegetation there includeArenaria rivularis,Calandrinia compacta,Deyeuxia curvula,Distichlis humilis,Lobelia oligophyllaandOxychloe andina.Animal species include birds such as theAndean flamingo,Andean gull,Andean goose,buff-winged cinclodes,Chilean flamingo,condor,giant coot,James's flamingo,mountain parakeet,Puna ibis,Puna tinamouandtorrent duck.Among the mammals are thealpaca,Altiplano chinchilla mouse,Andean swamp rat,lesser grison,llama,mountain degu,Osgood's leaf-eared mouse,short-tailed chinchillaandvicuña.[66]Woodlandsformed by the treePolylepis tarapacanaoccur on Guallatiri; this tree forms the world's highest woodlands.[67]The upper parts of the mountain are covered with rocks andpioneer vegetationto about 5,500 m (18,000 ft) elevation.[68]

The region has atundra climate.Most precipitation falls during the summer months, amounting to about 236 mm (9.3 in) per year, averaged between 1997 and 2017.[18][f]Moisture mainly originates in the Atlantic Ocean and theAmazon,especially during cold events of theEl Niño–Southern Oscillationwhen moisture supply increases.[67]Tree ringchronologies fromPolylepis tarapacanatrees growing at Guallatiri have been used for climate reconstructions.[70]

Eruptive history

[edit]
Geological map of Guallatiri

Volcanic activity at Guallatiri commenced either about 710,000[30]or 262,000–130,000 years ago[39]and the volcano subsequently grew during thePleistocene[g]andHolocene.[h][46]Total magma supply at Guallatiri amounts to 0.19–0.36 cubic kilometres per millennium (0.046–0.086 cubic miles per millennium), less than atParinacotabut greater than at Lascar.[58]

Jorquera et al. in 2019 described a two-stage growth of the volcano. Initially, the "Guallatiri I" stage grew in the form of andesitic and dacitic lava flows as well as heavily eroded pyroclastic deposits, which crop out around the volcano. Then the dacitic "Guallatiri II" developed in close proximity to the central vent; unlike the "Guallatiri I"unitsit has not been eroded by glaciation and flows still display flow structures.[39]The central sector of the volcano is mainly of Holocene age while the peripheral parts date to the Pleistocene.[38]In 2021, Sepúlveda et al. envisaged six[i]separate stages,[72]rocks from the first four crop out mainly at the periphery of the volcano and the last two in its central sector. All these units were erupted by the central vent of Guallatiri.[33]Some lava flows are well preserved, while others have been glaciated.[39]

Large eruptions similar to the 1993 eruption of Lascar may have occurred at Guallatiri.[75]The largest Holocene event at the volcano was aPlinian[j]orsub-Plinian[k]eruption that deposited tephra and pumice southwest of the volcano, reaching thicknesses of 1.3 m (4 ft 3 in) at 12 km (7.5 mi) distance,[46]approximately 2,600 years ago.[76]Non-explosive eruptions also took place, such as the Domo Tinto eruption 5,000 ± 3,000 years ago.[40]The eruption emplaced lobes of lava over a flat surface.[77]

Pyroclastic flowdeposits extend 10 km (6.2 mi) from Guallatiri.Radiocarbon datinghas yielded ages ranging between 6,255 ± 41 and 140 ± 30 yearsBefore Present.[40]These flows are unrelated to the lava domes, which show no evidence of collapses that could have formed pyroclastic flows.[49]Lahardeposits are found on the southern flanks of the volcano and do not exceed 2 m (6 ft 7 in) thickness.[40]They form when volcanic material interacts with water, produced either by the melting of ice or through intense rainfall.[57]Traces of Holocene-age lahars from Guallatiri have been found in river valleys.[78]

Historical and seismic activity

[edit]

Guallatiri is the second-most active volcano (afterLascar) in northern Chile. Since the 19th century, numerous smallexplosive eruptions[5]have produced thintephralayers.[35]The eruption history of Guallatiri is little known[79]and historical eruptions are poorly documented.[14]Eruptions with avolcanic explosivity index[l]of 2 took place in 1825 ± 25, 1913, July 1959, and December 1960. A further uncertain eruption took place in 1908[80]and additional poorly documented eruptions are reported from 1862, 1864, 1870, 1902, 1904, and 1987.[81]Radiocarbon dating has yielded evidence of at least one eruption during the past 200 years.[82]

Increased steam emission was observed in December 1985 and initially attributed to Acotango volcano, before it was linked to Guallatiri;[83]it may have been an eruption of the latter.[80]In May 2015, the ChileanNational Geology and Mining Service(SERNAGEOMIN) raised the volcano alert level when seismic activity increased and a 200 m (660 ft) high plume appeared over the volcano,[10]only to lower it again in July when activity decreased.[84]

Shallowearthquakes[85]and sporadicseismic swarmshave been recorded at Guallatiri;[30]one such swarm was induced by the2001 Peru earthquake.[86]Satellite imaging has not shown any evidence of ongoing deformation of the volcanic structure.[87]

Fumarolic activity

[edit]

Guallatiri featuresfumarolesandsolfataras,[1][59]andmud poolshave also been reported.[83]There are two main areas, one on the western flank 50 m (160 ft) below the summit and another on the south-southwestern flank. Fumaroles form alignments, and a 400 m (1,300 ft) long fracture lies in the southern area.[44][88]Some sources also identify a third area on the upper western flank.[28]The vents of individual fumaroles sometimes form 6 m (20 ft) wide and 3 m (10 ft) high cones, and there are small explosion craters reaching widths of 5 m (16 ft) in the summit region.Pahoehoe-like flows up to 15 m (50 ft) long have been formed by liquidsulfur.[44][88]Other minerals deposited by the fumaroles aresulfatessuch asbaryteandsulfides,includingcinnabar,antimonysulfides andarsenicsulfides.[89]

The temperatures of the fumaroles range between 83.2–265 °C (181.8–509.0 °F). Guallatiri produces gases consisting ofcarbon dioxideandwater vapour,withhydrogen chloride,hydrogen fluoride,hydrogen sulfide,methaneandsulfur dioxide[m]as additional components. They appear to originate from ahydrothermalsystem where intense rock-gas interaction takes place. The water originates in part from the magma and in part from precipitation.[43]Different degrees of interaction with precipitation water may explain why the south-southwestern flank fumarole gases have a different composition than these released in the summit region.[90]The fumarolic activity has produced intensehydrothermalalteration of Guallatiri's rocks[39]east-northeast of the summit and at a lower elevation northwest of it.[38]

Fumarole plume

[edit]

Fumarole clouds, derived mainly from the summit fumarole,[28]are visible for more than 200 km (125 mi)[21]and frominfraredsatelliteimages.[91]The fumarole cloud influences the perception of volcanic activity by the local population.[92]

Puffing behaviour was noted in 1996[84]and emissions every half-hour in November 1987, which gave rise to yellow-white plumes up to 1 km (0.62 mi) high.[83]Jet-like noises are heard from the fumaroles.[1]According to a report by mountaineers in 1966, fire emanated from the fumarole vents.[21]

Hazards and monitoring

[edit]

Future eruptions may consist of the emission of lava domes or lava flows, preceded byexplosive activitythat could impact the settlements of Ancuta and Guallatiri on the southern and western flanks. Large explosive eruptions could depositpyroclasticsover hundreds of kilometres, with the direction depending on the wind at the time of the eruption.[30]Laharswould mainly impact the western and southwestern sectors of the volcano, as the snow cover is concentrated there.Lava flowswould also primarily impact this sector of the volcano.Pyroclastic flowsmay impact areas within 12 km (7.5 mi) of Guallatiri, including the settlements Ancuta and Guallatiri.[79]Apart from Ancuta and Guallatiri in Chile, the volcano may threaten towns in Bolivia[14]and ash clouds from Guallatiri couldimpact airportsin the wider region as far asParaguay.[93]The vulnerability of the local population reflects both widespread poverty and marginalization, and the low population density.[94]Significant eruptions are expected to reoccur on century timescales.[10]

Guallatiri is in the second category in the Chilean scale of dangerous volcanoes[46]and is the 30th most dangerous in the country. In 2013, theSouthern Andean Volcano Observatorybegan to monitor Guallatiri by video, measurements of seismic activity and deformations of the volcanic structure.[10]Volcano hazard maps have been published.[95]

Mythology and religious importance

[edit]

Guallatiri was considered to be anapuormallku,a protective mountain spirit.[96][2]The mountain was and still is worshipped by local inhabitants, and the church in the town of Guallatiri is constructed so that it points to the volcano.[97]In the past, the Aymara community of Guallatire used to celebrate rituals at the foothills of the volcano every January 1.[98]They regarded Guallatiri, which they called Qapurata, to be a family consisting of a wife (the eastern María Qapurata), a husband (the western Pedro Qapurata) and a daughter (the middle Elena Qapurata).[3]

In theoral traditionofChipaya,cold winds calledsoqoblow from thePacific Oceanto theAltiplanoand towards Guallatiri.[99]The volcano there is linked withHell.[100]The Chipaya believed that the waters of theLauca Riveroriginate on Guallatiri and come directly from hell.[101]

See also

[edit]

Notes

[edit]
  1. ^Formerly it was part of theTarapacá Regionof Chile.[11]
  2. ^Before Ahlfeld's ascent in 1926 it was commonly believed that Guallatiri straddled the border.[22]
  3. ^The word "tephra" is used to describe various non-consolidated volcanic rocks derived from thefallout of pyroclastic material.[29]
  4. ^The height of the nearestkey colis 4,633 m (15,200 ft), leading to atopographic prominenceof 1,437 m (4,715 ft) with atopographical dominanceof 23.67%. Itsparent peakisParinacotaand thetopographic isolationis 29.1 km (18.1 mi).[31]
  5. ^Volcanic rocks containing large amounts ofironandmagnesium.[57]
  6. ^There is aweather stationat Guallatiri.[69]
  7. ^The geologic time period between 2.588 million and 11,700 years ago.[57]
  8. ^The geologic time period from 11,700 years ago to today.[71]
  9. ^The source says seven,[72]but at no point does it discuss or mention a seventh stage[73]other than the Domo Tinto.[74]
  10. ^A Plinian eruption is a large eruption witheruption columnsexceeding 20 km (12 mi) height, which can impact large areas. Usually it originates from viscous magmas.[29]
  11. ^A sub-Plinian eruption is a moderate to large eruption witheruption columnsnot exceeding 20 km (12 mi) height.[29]
  12. ^The volcanic explosivity index measures the intensity of volcanic eruptions, using their volume and the height of theeruption column.It is alogarithmicscale from 0 to 8, with the volume growing 10-fold for each step.[71]
  13. ^The volcano produces between123±47and50±12 tons/dayof sulfur dioxide.[89]

References

[edit]
  1. ^abcdefghijkGVP,General Information.
  2. ^abDíaz Araya 2020,p. 369.
  3. ^abMamani 2010,p. 141.
  4. ^abcEspinosa 2013,p. 38.
  5. ^abcdefSepúlveda et al. 2021,p. 1.
  6. ^GVP,Synonyms & Subfeatures.
  7. ^abCONAF.
  8. ^Echevarría 1963.
  9. ^Panajew & Gałaś 2020,p. 62.
  10. ^abcdefghJorquera et al. 2019,p. 6.
  11. ^abEchevarría 1999,p. 107.
  12. ^Zeil 1964,p. 751.
  13. ^abcWatts, Clavero Ribes & J. Sparks 2014,p. 559.
  14. ^abcdeSepúlveda, Inostroza & Esquivel 2018.
  15. ^abWatts, Clavero Ribes & J. Sparks 2014,p. 560.
  16. ^Charrier 1997,p. 9.
  17. ^Tapia et al. 2021,p. 2.
  18. ^abcdefgJorquera et al. 2019,p. 8.
  19. ^Jorquera et al. 2019,p. 7.
  20. ^Reinhard 2002,p. 90.
  21. ^abcBión 1966.
  22. ^Club Alemán Andino 1979,p. 31.
  23. ^Gliß et al. 2018,p. 784.
  24. ^Alvaro, Bertin & Orozco 2012,p. 37.
  25. ^Chacón Cruz et al. 2016,p. 11.
  26. ^Bond & de Schauensee 1942,p. 308.
  27. ^abcWörner et al. 1994,p. 82.
  28. ^abcJorquera et al. 2019,p. 45.
  29. ^abcdAlvaro, Bertin & Orozco 2012,p. 12.
  30. ^Kausch 2020.
  31. ^Jorquera et al. 2019,p. 5.
  32. ^abSepúlveda et al. 2021,pp. 4–6.
  33. ^abJorquera et al. 2019,p. 16.
  34. ^abStern et al. 2007,p. 151.
  35. ^Sepúlveda et al. 2021,p. 7.
  36. ^Reyes-Hardy et al. 2021,p. 4.
  37. ^abcdeSepúlveda et al. 2021,p. 3.
  38. ^abcdefgJorquera et al. 2019,p. 9.
  39. ^abcdeJorquera et al. 2019,p. 12.
  40. ^abcdSepúlveda et al. 2021,p. 6.
  41. ^abWatts, Clavero Ribes & J. Sparks 2014,p. 566.
  42. ^abInostroza et al. 2018,p. 1.
  43. ^abcInostroza et al. 2020,p. 3.
  44. ^Reyes-Hardy et al. 2021,p. 5.
  45. ^abcdRodriguez & Bertin 2018.
  46. ^Glaciología.
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  48. ^abSepúlveda et al. 2021,p. 13.
  49. ^Ammann et al. 2001,p. 314.
  50. ^Sepúlveda et al. 2021,p. 5.
  51. ^abcSepúlveda et al. 2021,p. 2.
  52. ^Inostroza et al. 2020,p. 1.
  53. ^Alvaro, Bertin & Orozco 2012,p. 5.
  54. ^David 2002,p. 171.
  55. ^abSepúlveda et al. 2021,p. 9.
  56. ^abcJorquera et al. 2019,p. 44.
  57. ^abSepúlveda et al. 2021,p. 14.
  58. ^abInostroza et al. 2020,p. 5.
  59. ^Inostroza et al. 2020,p. 6.
  60. ^Inostroza et al. 2020,pp. 11–12.
  61. ^Primer Congreso Panamericano de Ingeniería de Minas Y Geología 1942,p. 1652.
  62. ^Tapia et al. 2021,p. 11.
  63. ^Cáceres, Godoy & Wörner 2011,p. 36.
  64. ^Jaksic, Market & González 1997,p. 186.
  65. ^Espinosa 2013,p. 39.
  66. ^abChristie et al. 2009,p. 310.
  67. ^Panajew & Gałaś 2020,p. 48.
  68. ^Chacón Cruz et al. 2016,p. 99.
  69. ^Villalba et al. 2011,p. 205.
  70. ^abJorquera et al. 2019,p. 43.
  71. ^abSepúlveda et al. 2021,p. 4.
  72. ^Sepúlveda et al. 2021,pp. 1–17.
  73. ^Sepúlveda et al. 2021,Fig2.
  74. ^Alvaro, Bertin & Orozco 2012,p. 26.
  75. ^Jorquera et al. 2019,p. 13.
  76. ^Watts, Clavero Ribes & J. Sparks 2014,p. 585.
  77. ^Reyes-Hardy et al. 2021,p. 6.
  78. ^abReyes et al. 2018.
  79. ^abGVP,Eruptive history.
  80. ^Jorquera et al. 2019,p. 38.
  81. ^Jorquera et al. 2019,p. 14.
  82. ^abcGVP,Bulletin Reports.
  83. ^abGVP,Latest Activity Reports.
  84. ^David 2002,p. 172.
  85. ^Jay et al. 2013,p. 182.
  86. ^Pritchard & Simons 2002,p. 167.
  87. ^abInostroza et al. 2020,pp. 3, 5.
  88. ^abInostroza et al. 2021,p. 2.
  89. ^Inostroza et al. 2020,p. 7.
  90. ^Francis 1986,p. 7.
  91. ^Romero & Albornoz 2013,p. 520.
  92. ^Reyes-Hardy et al. 2021,p. 16.
  93. ^Reyes-Hardy et al. 2021,p. 17.
  94. ^Reyes-Hardy et al. 2021,p. 3.
  95. ^Muñoz 2020,p. 465.
  96. ^Reinhard 2002,p. 92.
  97. ^Mamani 2010,p. 142.
  98. ^Cereceda 2010,pp. 101, 106.
  99. ^Cereceda 2010,p. 122.
  100. ^Bouysse-Cassagne 2014.

Sources

[edit]
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