Publication: La avalancha de rocas de Son Cocó (Alaró, Mallorca).
Descripción y análisis del movimiento
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Publication Date
2010
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Instituto Geológico y Minero de España (Madrid)
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Abstract
El temporal de lluvia y frío que afectó a Mallorca durante los meses de octubre de 2008 a enero de 2009, ha desencadenado numerosos movimientos de ladera, registrándose 12 movimientos significativos en la Serra de Tramuntana, algunos de los cuales han afectado seriamente a las vías de comunicación. La noche del 19 de diciembre de 2008 tuvo lugar, en la vertiente oriental del Puig de s’Alcadena (tm de Alaró), un gran desprendimiento de rocas que generó una avalancha sobre la ladera, con un alcance de unos 650 m. La avalancha arrasó el bosque de pinar que encontró a su paso, dejando una lengua de bloques de unos 60.000 m2 de superficie y 300.000 m3 de volumen. Algunos de los bloques movilizados presentan volúmenes superiores a 1.500 m3 y varios miles de toneladas de peso. La rotura en cuña del escarpe rocoso del Puig de s´Alcadena se produce a través de dos planos, que coinciden con las principales directrices tectónicas de la Sierra. La coincidencia de lluvias intensas y continuadas en la zona (150 mm en 24 horas y 672 mm de lluvia acumulada), con la ocurrencia de bajas e inusuales temperaturas (inferiores a 0ºC), fue el motor desencadenante de la avalancha. Afortunadamente, no se registraron daños personales ni materiales.
From October 2008 to January 2009, Majorca island was affected by a period of intense rainfall and low temperatures which triggered numerous slope movements, 12 being registered in the Tramuntana Range, some of which seriously affected the road network. On the night 19th December 2008, a rockfall on the eastern slope of the Puig de s´Alcadena (Alaro) took place, generating a rock avalanche with a length of 650 m. The rock avalanche destroyed the pine wood in its path, leaving a tongue of blocks over an area of 60.000 m2and 300.000 m3 in volume. Some of the blocks have a volume of over 1,500 m3 and are several tones in weight. The wedge failure on the scarp of Puig de s´Alcadena is produced on two planes which coincide with the main tectonic features of the Range. The fact that heavy and continuous rainfall (150 mm in 24 h and 672 mm of accumulated rainfall) coincided with unusually low temperatures (below 0ºC), was the triggering factor of the avalanche. Fortunately, no serious damage occurred.
From October 2008 to January 2009, Majorca island was affected by a period of intense rainfall and low temperatures which triggered numerous slope movements, 12 being registered in the Tramuntana Range, some of which seriously affected the road network. On the night 19th December 2008, a rockfall on the eastern slope of the Puig de s´Alcadena (Alaro) took place, generating a rock avalanche with a length of 650 m. The rock avalanche destroyed the pine wood in its path, leaving a tongue of blocks over an area of 60.000 m2and 300.000 m3 in volume. Some of the blocks have a volume of over 1,500 m3 and are several tones in weight. The wedge failure on the scarp of Puig de s´Alcadena is produced on two planes which coincide with the main tectonic features of the Range. The fact that heavy and continuous rainfall (150 mm in 24 h and 672 mm of accumulated rainfall) coincided with unusually low temperatures (below 0ºC), was the triggering factor of the avalanche. Fortunately, no serious damage occurred.