A rare case of grass flow induced by the M8.4 Arequipa earthquake, June 2001, in the Altiplano of Northern Chile |
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| Authors: | José A Naranjo Jorge E Clavero |
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| Institution: | Servicio Nacional de Geología y Minería-Chile, Avenue Santa María, 0104-Providencia, Santiago, Chile |
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| Abstract: | On June 23, 2001, an M8.4 earthquake that originated in southern Peru triggered the partial collapse of the Chislluma bofedal (water meadows) in the Altiplano (high-altitude plateau) of northern Chile. The seismic waves evidently produced the liquefaction of the bofedal and caused its partial collapse generating a flow. The flow deposit was mainly made of long-fiber grass and water, with minor amounts of clastic material. It traveled more than 14 km downstream at a peak velocity of 50 km/h. It destroyed the water meadows and killed more than 20 llamas. Slurry flows caused by meadow liquefaction are a previously unrecognized seismic-induced geological hazard for high-altitude plateau areas such as the Altiplano. |
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| Keywords: | Long-fiber grass flow Liquefaction Organic soil Inter-plate earthquake High-altitude plateau Altiplano Andes |
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