Speleoseismology and palaeoseismicity of Benis Cave (Murcia, SE Spain): coseismic effects of the 1999 Mula earthquake (mb 4.8)

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Pérez López, Raúl and Rodríguez-Pascua, M.A. and Giner Robles, Jorge L. and Martínez Díaz, José J. and Marcos Nuez, A. and Silva Barroso, Pablo Gabriel and Bejar Pizarro, Marta and Calvo Sorando, José Pedro (2009) Speleoseismology and palaeoseismicity of Benis Cave (Murcia, SE Spain): coseismic effects of the 1999 Mula earthquake (mb 4.8). Geological Society Special Publication, 316 . pp. 207-216. ISSN 0305-8719

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Official URL: https://doi.org/10.1144/SP316.13



Abstract

This work describes the coseismic ceiling block collapse within Benis Cave (−213 m; Murcia, SE Spain), associated with the 1999 Mula earthquake (mb=4.8, MSK VII). The collapse occurred at −156 m into the Earthquake Hall, and as a consequence one small gallery became blind. We studied the geology, topography and active tectonic structures relevant to the cave. In addition, we carried out a seismotectonic analysis of the focal mechanism solutions, and also a fault population analysis on slickensides measured in fault planes in the cave. The stress and strain regime is interpreted as being congruent with the palaeoseismic evidence, and agrees with the fault kinematics established for cave galleries developed within fault planes and growth anomalies of coral flowstone. Our analysis suggests that one active segment (NNE–SSW) determined the morphology and topography of the Benis Cave, where strong to moderate palaeoearthquakes (6≤M≤7) took place. As a consequence of this intense seismic activity a small gallery collapsed. A new palaeoseismic structure, or seismothem, has been recognized, namely the effect of palaeoearthquakes affecting the pattern of development of the spatial coral flowstone distribution located at the bottom of the cave.


Item Type:Article
Uncontrolled Keywords:Seismology, Benis cave
Subjects:Sciences > Geology > Seismology
ID Code:60641
Deposited On:25 May 2020 11:26
Last Modified:25 May 2020 15:24

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