Product ID: 1571 - English
Published: 5 Aug, 2011

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Summary Points

1. Main eruption of ash flow is from the Cordón Caulle fissure on northern face of mountain, not the main Puyehue Caldera

2. Initial ash flow detected on 4 June 2011 with first distinct Thermal signatures detected on morning of 5 June 2011
3. 3D Topographic review of border terrain strongly suggests no direct threat of volcanic induced lahars event from CordónCaullefissure (or PuyehueCaldera) within Argentina, due to distinct watershed boundary along Andes

4. Ash cloud drift direction has ranged within a broad 150 degree cone almost entirely over Argentinean territory, however the majority of measured ash clouds were drifting within a smaller cone east-southeast (between 90-140 degrees) with a secondary cone north-northeast (350-90 degrees)

5. The zone of heaviest ash deposition appears within imagery to be within a zone approximately 10,000km2 in area, ranging up to 110km from the volcanic fissure

6. There were clearly visible ash deposits on Argentinean lake surfaces within 110km of the volcano on 11 June 2011
* Almost the entire surface of LagoA. Gallardo was covered in ash (12km2)
* Ash drifts over 30km long and with max width of 800m visible on Lago Nahuel Huapi