A NEW ERUPTIVE CYCLE OF LASCAR VOLCANO (CHILE) : THE RISK FOR THE AERONAVIGATION IN NORTHERN ARGENTINA J.G. Viramonte1, F. Aguilera2, H. Delgado3, L.A. Rodríguez4, K.P. Guzman2, J.C. Jiménez3 & R.A. Becchio1 1

Instituto GEONORTE Universidad Nacional de Salta and CONICET Buenos Aires 177- 4440 Salta- Aregentina 2 Universidad Católica del Norte. Av. Angamos 610, Antofagasta, Chile 3 Instituto de Geofísica, UNAM, Mexico 4 Geological and Mining Enginering and Sciences, Michigan Technological University, 1400 Townsend Dr Houghton M 44931

Lascar ( 23.37°S – 67,73°W) is the most active volcano in the Central Andes. Frequent small-to-moderate explosive eruptions have been recorded in historical times since the mid-18th century, along with periodic larger eruptions that produced ashfalls hundreds of kilometers away from the volcano. The largest historical eruption of Lascar took place on 18 April 1993, producing pyroclastic flows from the collapse of a 25 km high, Plinian plume. The PF were distributed to the NW and SE of the summit, and ashfall was witnessed in Buenos Aires, Argentina and Porto Alegre, Brazil. After 7 years of relative quiescence, in June 2000, Lascar began a new eruptive cycle with short but relatively strong vulcanian and phreatic explosions. Recently, in May 2005 and April 2006 two new eruptions took place. The first produced a column that reached heights of 10-11 km and the volcanic cloud traveled to the southeast. Very fine ashfall reached Salta, a city with aproximately 600,000 inhabitants in northern Argentina (285 km SSE from the source) in less than 3 hours. The second eruption occurred on April 18, 2006 exactly on 13th anniversary of the big 1993 eruption, in this case, followed by a second explosion on April 20. Both related volcanic clouds traveled to the NNE. Visual observations and satellite imagery analysis, suggest that the first explosion was a strong pheatic eruption with high contents of water vapor and very poor in ash content, rising to the tropopause (15,000 m). The last explosion was less strong but richer in ash. The column reached about 7,000-8,000 m in altitude. The wind patterns at different altitudes (compiled from the Argentine, Servicio Metereológico Nacional database), show permanent directions to the East, with sudden shifts to NNE and SSW. This situation, together with the frequent presence of jet streams near the tropopause, transported the ash cloud very fast and in many cases, directly affected, the northwestern domestic air traffic in Argentina, where important cities are located, and the international air traffic between Buenos Aires and Montevideo to the north. These events evidence the impact of relatively “mild” eruptions of Lascar on the local and international economic activities.

A NEW ERUPTIVE CYCLE OF LASCAR VOLCANO ...

The largest historical eruption of Lascar took ... 10-11 km and the volcanic cloud traveled to the southeast. ... Both related volcanic clouds traveled to the NNE.

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