Valena Berry and Rachel
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Valena Berry and Rachel
Valena Berry and Rachel KenneyValena Berry and Rachel Kenney
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Southern Chilean Andres, South America
6.21 miles NE of the town of Chaitén on the Gulf of Corcovado
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Elliptical Caldera: 1.55 x 2.49 miles wide
Summit Elevation: 3,681 Ft.
Last eruption: 9,400 yrs ago.
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Ash plume rose over 13.05 miles in altitude and drifted SSE.
Lightning storm with eruption. Dubbed a ‘Dirty Thunderstorm’.
Ashfall continued to occur daily in large plumes through to the 6th of May.
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May 2nd: Government declared state of emergency and evacuated several hundred people from the town of Chaitén 6.21 miles SE of the volcano.
May 3rd through the 6th: reported 4,000 to 5,000 people evacuated from Chaitén and surrounding area.
May 5th: evacuation of Futaleufú, 40.4 miles ESE, took place. ~11.81 inches of ash had accumulated. One elderly person died during the evacuation.
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A new lava dorm growth on the large one within the caldera.
24th of May, observation of a vigorous explosion from the old dome and the new dome overtakes it in height.
Ash plumes continue to rise, but only 1.86 to 3.11 miles in height.
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Early in the month, ash and steam plumes rose to 4.35 miles in altitude.
6,200 acres of forest to the N and NE sides burned by pyroclastic flows and lateral explosions.
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Ash plumes remain at 1.86 miles in altitude.
Lahars overtake drainages during June 27th and 28th, especially in the Chaitén and Amarrillo rivers.
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Agriculture Impacts
Main concerns: Lahars and Tephra Farm Land Area Affected:Effects: Good and Bad
Livestock
Death: Livestock buried in pasturesSkin Fungal infectionsAccelerated wear on teeth and gumsGovernment provided farm-recovery funds
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Structural DamageUrban and Rural Communities:Individual town: Futeleufú 300mm ash (11.81 inches)Disrupted water, electricity, transportation, and telecommunication.Residential/commercial damage:GuttersRoof cladding corrosionStructural roof damageInternal ash contaminationHydro-electric damsBridges destroyed by lahars
AviationMass flight cancellationsClosed airports Ash in airspace weeks afterTurbine damage
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Volcanic Lightning Storm: How do they form? A “shear layer” of intense horizontal winds and “updraught” from the volcano
create multiple vortices that counter-rotate. Eddies form inside, because of instability Expanding umbrella becomes cooler on the outside and denser than the
surrounding air Supercells form within the updraught as well as precipitationFun Fact: Miller experimentFaulting: Sitting on an active secondary fault Mostly strike-slip faulting Possibly the cause of the eruption
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Continuing Activity by August 2008:120 m Lava domeEarthquakes at summitBoulders avalanching into craterVolcano degassing/ash
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