Slope instabilities triggered by the 2011 Lorca earthquake (Mw 5.1): a comparison and revision of hazard assessments of earthquake-triggered landslides in Murcia

M. J. Rodríguez-Peces; J. García-Mayordomo; J. J. Martínez-Díaz; M. Tsige

doi:10.21701/bolgeomin.123.4.004

Autores/as

M. J. Rodríguez-Peces Departamento de Geodinámica, Universidad Complutense de Madrid
J. García-Mayordomo Instituto Geológico y Minero de España (IGME)
J. J. Martínez-Díaz Departamento de Geodinámica, Universidad Complutense de Madrid
M. Tsige Departamento de Geodinámica, Universidad Complutense de Madrid

DOI:

https://doi.org/10.21701/bolgeomin.123.4.004

Palabras clave:

desprendimiento, Lorca, Newmark, peligrosidad, susceptibilidad, terremoto

Resumen

La Cuenca de Lorca ha sido el objetivo de investigaciones recientes en las que se estudia el fenómeno de las inestabilidades de ladera inducidas por terremotos y su evaluación en el marco de diferentes escenarios sísmicos, teniendo en cuenta los efectos de amplificación sísmica debidos a la estratigrafía local y la topografía. Sin embargo, no ha sido hasta la ocurrencia de los terremotos del 11 de Mayo de 2011 en Lorca cuando ha sido posible realizar un análisis sistemático de este problema. En este artículo presentamos un inventario de 100 inestabilidades de ladera provocadas por los terremotos de Lorca, siendo principalmente desprendimientos de roca y suelo de pequeño tamaño (1 a 100 m³). La distribución de estos movimientos de ladera ha sido comparada con dos mapas de peligrosidad de inestabilidades: el primero, considerando la ocurrencia del terremoto más probable para un periodo de retorno de 475 años en la Cuenca de Lorca (M_w = 5.0), publicado anteriormente a partir de un modelo digital de elevaciones (MDE) de baja resolución; y un segundo, considerando el caso real del terremoto de Lorca 2011 (M_w = 5.1) mediante el uso de un MDE de mucha mayor resolución. Los desplazamientos de Newmark más frecuentes relacionados con las inestabilidades provocadas por los terremotos de Lorca 2011 son menores de 2 cm en ambos escenarios de peligrosidad considerados, coincidiendo con zonas donde se han producido importantes efectos de amplificación sísmica (estratigráfica y topográfica).

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Citas

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